<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="generator" content="rustdoc"> <meta name="description" content="Source to the Rust file `libcore/fmt/mod.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>mod.rs.html -- source</title> <link rel="stylesheet" type="text/css" href="../../../normalize.css"> <link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"> <link rel="stylesheet" type="text/css" href="../../../dark.css"> <link rel="stylesheet" type="text/css" href="../../../main.css" id="themeStyle"> <script src="../../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </head> <body class="rustdoc source"> <!--[if lte IE 8]> <div class="warning"> This old browser is unsupported and will most likely display funky things. </div> <![endif]--> <nav class="sidebar"> <div class="sidebar-menu">☰</div> <a href='../../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> </nav> <div class="theme-picker"> <button id="theme-picker" aria-label="Pick another theme!"> <img src="../../../brush.svg" width="18" alt="Pick another theme!"> </button> <div id="theme-choices"></div> </div> <script src="../../../theme.js"></script> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span id="12"> 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id="648"> 648</span> <span id="649"> 649</span> <span id="650"> 650</span> <span id="651"> 651</span> <span id="652"> 652</span> <span id="653"> 653</span> <span id="654"> 654</span> <span id="655"> 655</span> <span id="656"> 656</span> <span id="657"> 657</span> <span id="658"> 658</span> <span id="659"> 659</span> <span id="660"> 660</span> <span id="661"> 661</span> <span id="662"> 662</span> <span id="663"> 663</span> <span id="664"> 664</span> <span id="665"> 665</span> <span id="666"> 666</span> <span id="667"> 667</span> <span id="668"> 668</span> <span id="669"> 669</span> <span id="670"> 670</span> <span id="671"> 671</span> <span id="672"> 672</span> <span id="673"> 673</span> <span id="674"> 674</span> <span id="675"> 675</span> <span id="676"> 676</span> <span id="677"> 677</span> <span id="678"> 678</span> <span id="679"> 679</span> <span id="680"> 680</span> <span id="681"> 681</span> <span id="682"> 682</span> <span id="683"> 683</span> <span id="684"> 684</span> <span id="685"> 685</span> <span id="686"> 686</span> <span id="687"> 687</span> <span id="688"> 688</span> <span id="689"> 689</span> <span id="690"> 690</span> <span id="691"> 691</span> <span id="692"> 692</span> <span id="693"> 693</span> <span id="694"> 694</span> <span id="695"> 695</span> <span id="696"> 696</span> <span id="697"> 697</span> <span id="698"> 698</span> <span id="699"> 699</span> <span id="700"> 700</span> <span id="701"> 701</span> <span id="702"> 702</span> <span id="703"> 703</span> <span id="704"> 704</span> <span id="705"> 705</span> <span id="706"> 706</span> <span id="707"> 707</span> <span id="708"> 708</span> <span id="709"> 709</span> <span id="710"> 710</span> <span id="711"> 711</span> <span id="712"> 712</span> <span id="713"> 713</span> <span id="714"> 714</span> <span id="715"> 715</span> <span id="716"> 716</span> <span id="717"> 717</span> <span id="718"> 718</span> <span id="719"> 719</span> <span id="720"> 720</span> <span id="721"> 721</span> <span id="722"> 722</span> <span id="723"> 723</span> <span id="724"> 724</span> <span id="725"> 725</span> <span id="726"> 726</span> <span id="727"> 727</span> <span id="728"> 728</span> <span id="729"> 729</span> <span id="730"> 730</span> <span id="731"> 731</span> <span id="732"> 732</span> <span id="733"> 733</span> <span id="734"> 734</span> <span id="735"> 735</span> <span id="736"> 736</span> <span id="737"> 737</span> <span id="738"> 738</span> <span id="739"> 739</span> <span id="740"> 740</span> <span id="741"> 741</span> <span id="742"> 742</span> <span id="743"> 743</span> <span id="744"> 744</span> <span id="745"> 745</span> <span id="746"> 746</span> <span id="747"> 747</span> <span id="748"> 748</span> <span id="749"> 749</span> <span id="750"> 750</span> <span id="751"> 751</span> <span id="752"> 752</span> <span id="753"> 753</span> <span id="754"> 754</span> <span id="755"> 755</span> <span id="756"> 756</span> <span id="757"> 757</span> <span id="758"> 758</span> <span id="759"> 759</span> <span id="760"> 760</span> <span id="761"> 761</span> <span id="762"> 762</span> <span id="763"> 763</span> <span id="764"> 764</span> <span id="765"> 765</span> <span id="766"> 766</span> <span id="767"> 767</span> <span id="768"> 768</span> <span id="769"> 769</span> <span id="770"> 770</span> <span id="771"> 771</span> <span id="772"> 772</span> <span id="773"> 773</span> <span id="774"> 774</span> <span id="775"> 775</span> <span id="776"> 776</span> <span id="777"> 777</span> <span id="778"> 778</span> <span id="779"> 779</span> <span id="780"> 780</span> <span id="781"> 781</span> <span id="782"> 782</span> <span id="783"> 783</span> <span id="784"> 784</span> <span id="785"> 785</span> <span id="786"> 786</span> <span id="787"> 787</span> <span id="788"> 788</span> <span id="789"> 789</span> <span id="790"> 790</span> <span id="791"> 791</span> <span id="792"> 792</span> <span id="793"> 793</span> <span id="794"> 794</span> <span id="795"> 795</span> <span id="796"> 796</span> <span id="797"> 797</span> <span id="798"> 798</span> <span id="799"> 799</span> <span id="800"> 800</span> <span id="801"> 801</span> <span id="802"> 802</span> <span id="803"> 803</span> <span id="804"> 804</span> <span id="805"> 805</span> <span id="806"> 806</span> <span id="807"> 807</span> <span id="808"> 808</span> <span id="809"> 809</span> <span id="810"> 810</span> <span id="811"> 811</span> <span id="812"> 812</span> <span id="813"> 813</span> <span id="814"> 814</span> <span id="815"> 815</span> <span id="816"> 816</span> <span id="817"> 817</span> <span id="818"> 818</span> <span id="819"> 819</span> <span id="820"> 820</span> <span id="821"> 821</span> <span id="822"> 822</span> <span id="823"> 823</span> <span id="824"> 824</span> <span id="825"> 825</span> <span id="826"> 826</span> <span id="827"> 827</span> <span id="828"> 828</span> <span id="829"> 829</span> <span id="830"> 830</span> <span id="831"> 831</span> <span id="832"> 832</span> <span id="833"> 833</span> <span id="834"> 834</span> <span id="835"> 835</span> <span id="836"> 836</span> <span id="837"> 837</span> <span id="838"> 838</span> <span id="839"> 839</span> <span id="840"> 840</span> <span id="841"> 841</span> <span id="842"> 842</span> <span id="843"> 843</span> <span id="844"> 844</span> <span id="845"> 845</span> <span id="846"> 846</span> <span id="847"> 847</span> <span id="848"> 848</span> <span id="849"> 849</span> <span id="850"> 850</span> <span id="851"> 851</span> <span id="852"> 852</span> <span id="853"> 853</span> <span id="854"> 854</span> <span id="855"> 855</span> <span id="856"> 856</span> <span id="857"> 857</span> <span id="858"> 858</span> <span id="859"> 859</span> <span id="860"> 860</span> <span id="861"> 861</span> <span id="862"> 862</span> <span id="863"> 863</span> <span id="864"> 864</span> <span id="865"> 865</span> <span id="866"> 866</span> <span id="867"> 867</span> <span id="868"> 868</span> <span id="869"> 869</span> <span id="870"> 870</span> <span id="871"> 871</span> <span id="872"> 872</span> <span id="873"> 873</span> <span id="874"> 874</span> <span id="875"> 875</span> <span id="876"> 876</span> <span id="877"> 877</span> <span id="878"> 878</span> <span id="879"> 879</span> <span id="880"> 880</span> <span id="881"> 881</span> <span id="882"> 882</span> <span id="883"> 883</span> <span id="884"> 884</span> <span id="885"> 885</span> <span id="886"> 886</span> <span id="887"> 887</span> <span id="888"> 888</span> <span id="889"> 889</span> <span id="890"> 890</span> <span id="891"> 891</span> <span id="892"> 892</span> <span id="893"> 893</span> <span id="894"> 894</span> <span id="895"> 895</span> <span id="896"> 896</span> <span id="897"> 897</span> <span id="898"> 898</span> <span id="899"> 899</span> <span id="900"> 900</span> <span id="901"> 901</span> <span id="902"> 902</span> <span id="903"> 903</span> <span id="904"> 904</span> <span id="905"> 905</span> <span id="906"> 906</span> <span id="907"> 907</span> <span id="908"> 908</span> <span id="909"> 909</span> <span id="910"> 910</span> <span id="911"> 911</span> <span id="912"> 912</span> <span id="913"> 913</span> <span id="914"> 914</span> <span id="915"> 915</span> <span id="916"> 916</span> <span id="917"> 917</span> <span id="918"> 918</span> <span id="919"> 919</span> <span id="920"> 920</span> <span id="921"> 921</span> <span id="922"> 922</span> <span id="923"> 923</span> <span id="924"> 924</span> <span id="925"> 925</span> <span id="926"> 926</span> <span id="927"> 927</span> <span id="928"> 928</span> <span id="929"> 929</span> <span id="930"> 930</span> <span id="931"> 931</span> <span id="932"> 932</span> <span id="933"> 933</span> <span id="934"> 934</span> <span id="935"> 935</span> <span id="936"> 936</span> <span id="937"> 937</span> <span id="938"> 938</span> <span id="939"> 939</span> <span id="940"> 940</span> <span id="941"> 941</span> <span id="942"> 942</span> <span id="943"> 943</span> <span id="944"> 944</span> <span id="945"> 945</span> <span id="946"> 946</span> <span id="947"> 947</span> <span id="948"> 948</span> <span id="949"> 949</span> <span id="950"> 950</span> <span id="951"> 951</span> <span id="952"> 952</span> <span id="953"> 953</span> <span id="954"> 954</span> <span id="955"> 955</span> <span id="956"> 956</span> <span id="957"> 957</span> <span id="958"> 958</span> <span id="959"> 959</span> <span id="960"> 960</span> <span id="961"> 961</span> <span id="962"> 962</span> <span id="963"> 963</span> <span id="964"> 964</span> <span id="965"> 965</span> <span id="966"> 966</span> <span id="967"> 967</span> <span id="968"> 968</span> <span id="969"> 969</span> <span id="970"> 970</span> <span id="971"> 971</span> <span id="972"> 972</span> <span id="973"> 973</span> <span id="974"> 974</span> <span id="975"> 975</span> <span id="976"> 976</span> <span id="977"> 977</span> <span id="978"> 978</span> <span id="979"> 979</span> <span id="980"> 980</span> <span id="981"> 981</span> <span id="982"> 982</span> <span id="983"> 983</span> <span id="984"> 984</span> <span id="985"> 985</span> <span id="986"> 986</span> <span id="987"> 987</span> <span id="988"> 988</span> <span id="989"> 989</span> <span id="990"> 990</span> <span id="991"> 991</span> <span id="992"> 992</span> <span id="993"> 993</span> <span id="994"> 994</span> <span id="995"> 995</span> <span id="996"> 996</span> <span id="997"> 997</span> <span id="998"> 998</span> <span id="999"> 999</span> <span id="1000">1000</span> <span id="1001">1001</span> <span id="1002">1002</span> <span id="1003">1003</span> <span id="1004">1004</span> <span id="1005">1005</span> <span id="1006">1006</span> <span id="1007">1007</span> <span id="1008">1008</span> <span id="1009">1009</span> <span id="1010">1010</span> <span id="1011">1011</span> <span id="1012">1012</span> <span id="1013">1013</span> <span id="1014">1014</span> <span id="1015">1015</span> <span id="1016">1016</span> <span id="1017">1017</span> <span id="1018">1018</span> <span id="1019">1019</span> <span id="1020">1020</span> <span id="1021">1021</span> <span id="1022">1022</span> <span id="1023">1023</span> <span id="1024">1024</span> <span id="1025">1025</span> <span id="1026">1026</span> <span id="1027">1027</span> <span id="1028">1028</span> <span id="1029">1029</span> <span id="1030">1030</span> <span id="1031">1031</span> <span id="1032">1032</span> <span id="1033">1033</span> <span id="1034">1034</span> <span id="1035">1035</span> <span id="1036">1036</span> <span id="1037">1037</span> <span id="1038">1038</span> <span id="1039">1039</span> <span id="1040">1040</span> <span id="1041">1041</span> <span id="1042">1042</span> <span id="1043">1043</span> <span id="1044">1044</span> <span id="1045">1045</span> <span id="1046">1046</span> <span id="1047">1047</span> <span id="1048">1048</span> <span id="1049">1049</span> <span id="1050">1050</span> <span id="1051">1051</span> <span id="1052">1052</span> <span id="1053">1053</span> <span id="1054">1054</span> <span id="1055">1055</span> <span id="1056">1056</span> <span id="1057">1057</span> <span id="1058">1058</span> <span id="1059">1059</span> <span id="1060">1060</span> <span id="1061">1061</span> <span id="1062">1062</span> <span id="1063">1063</span> <span id="1064">1064</span> <span id="1065">1065</span> <span id="1066">1066</span> <span id="1067">1067</span> <span id="1068">1068</span> <span id="1069">1069</span> <span id="1070">1070</span> <span id="1071">1071</span> <span id="1072">1072</span> <span id="1073">1073</span> <span id="1074">1074</span> <span id="1075">1075</span> <span id="1076">1076</span> <span id="1077">1077</span> <span id="1078">1078</span> <span id="1079">1079</span> <span id="1080">1080</span> <span id="1081">1081</span> <span id="1082">1082</span> <span id="1083">1083</span> <span id="1084">1084</span> <span id="1085">1085</span> <span id="1086">1086</span> <span id="1087">1087</span> <span id="1088">1088</span> <span id="1089">1089</span> <span id="1090">1090</span> <span id="1091">1091</span> <span id="1092">1092</span> <span id="1093">1093</span> <span id="1094">1094</span> <span id="1095">1095</span> <span id="1096">1096</span> <span id="1097">1097</span> <span id="1098">1098</span> <span id="1099">1099</span> <span id="1100">1100</span> <span id="1101">1101</span> <span id="1102">1102</span> <span id="1103">1103</span> <span id="1104">1104</span> <span id="1105">1105</span> <span id="1106">1106</span> <span id="1107">1107</span> <span id="1108">1108</span> <span id="1109">1109</span> <span id="1110">1110</span> <span id="1111">1111</span> <span id="1112">1112</span> <span id="1113">1113</span> <span id="1114">1114</span> <span id="1115">1115</span> <span id="1116">1116</span> <span id="1117">1117</span> <span id="1118">1118</span> <span id="1119">1119</span> <span id="1120">1120</span> <span id="1121">1121</span> <span id="1122">1122</span> <span id="1123">1123</span> <span id="1124">1124</span> <span id="1125">1125</span> <span id="1126">1126</span> <span id="1127">1127</span> <span id="1128">1128</span> <span id="1129">1129</span> <span id="1130">1130</span> <span id="1131">1131</span> <span id="1132">1132</span> <span id="1133">1133</span> <span id="1134">1134</span> <span id="1135">1135</span> <span id="1136">1136</span> <span id="1137">1137</span> <span id="1138">1138</span> <span id="1139">1139</span> <span id="1140">1140</span> <span id="1141">1141</span> <span id="1142">1142</span> <span id="1143">1143</span> <span id="1144">1144</span> <span id="1145">1145</span> <span id="1146">1146</span> <span id="1147">1147</span> <span id="1148">1148</span> <span id="1149">1149</span> <span id="1150">1150</span> <span id="1151">1151</span> <span id="1152">1152</span> <span id="1153">1153</span> <span id="1154">1154</span> <span id="1155">1155</span> <span id="1156">1156</span> <span id="1157">1157</span> <span id="1158">1158</span> <span id="1159">1159</span> <span id="1160">1160</span> <span id="1161">1161</span> <span id="1162">1162</span> <span id="1163">1163</span> <span id="1164">1164</span> <span id="1165">1165</span> <span id="1166">1166</span> <span id="1167">1167</span> <span id="1168">1168</span> <span id="1169">1169</span> <span id="1170">1170</span> <span id="1171">1171</span> <span id="1172">1172</span> <span id="1173">1173</span> <span id="1174">1174</span> <span id="1175">1175</span> <span id="1176">1176</span> <span id="1177">1177</span> <span id="1178">1178</span> <span id="1179">1179</span> <span id="1180">1180</span> <span id="1181">1181</span> <span id="1182">1182</span> <span id="1183">1183</span> <span id="1184">1184</span> <span id="1185">1185</span> <span id="1186">1186</span> <span id="1187">1187</span> <span id="1188">1188</span> <span id="1189">1189</span> <span id="1190">1190</span> <span id="1191">1191</span> <span id="1192">1192</span> <span id="1193">1193</span> <span id="1194">1194</span> <span id="1195">1195</span> <span id="1196">1196</span> <span id="1197">1197</span> <span id="1198">1198</span> <span id="1199">1199</span> <span id="1200">1200</span> <span id="1201">1201</span> <span id="1202">1202</span> <span id="1203">1203</span> <span id="1204">1204</span> <span id="1205">1205</span> <span id="1206">1206</span> <span id="1207">1207</span> <span id="1208">1208</span> <span id="1209">1209</span> <span id="1210">1210</span> <span id="1211">1211</span> <span id="1212">1212</span> <span id="1213">1213</span> <span id="1214">1214</span> <span id="1215">1215</span> <span id="1216">1216</span> <span id="1217">1217</span> <span id="1218">1218</span> <span id="1219">1219</span> <span id="1220">1220</span> <span id="1221">1221</span> <span id="1222">1222</span> <span id="1223">1223</span> <span id="1224">1224</span> <span id="1225">1225</span> <span id="1226">1226</span> <span id="1227">1227</span> <span id="1228">1228</span> <span id="1229">1229</span> <span id="1230">1230</span> <span id="1231">1231</span> <span id="1232">1232</span> <span id="1233">1233</span> <span id="1234">1234</span> <span id="1235">1235</span> <span id="1236">1236</span> <span id="1237">1237</span> <span id="1238">1238</span> <span id="1239">1239</span> <span id="1240">1240</span> <span id="1241">1241</span> <span id="1242">1242</span> <span id="1243">1243</span> <span id="1244">1244</span> <span id="1245">1245</span> <span id="1246">1246</span> <span id="1247">1247</span> <span id="1248">1248</span> <span id="1249">1249</span> <span id="1250">1250</span> <span id="1251">1251</span> <span id="1252">1252</span> <span id="1253">1253</span> <span id="1254">1254</span> <span id="1255">1255</span> <span id="1256">1256</span> <span id="1257">1257</span> <span id="1258">1258</span> <span id="1259">1259</span> <span id="1260">1260</span> <span id="1261">1261</span> <span id="1262">1262</span> <span id="1263">1263</span> <span id="1264">1264</span> <span id="1265">1265</span> <span id="1266">1266</span> <span id="1267">1267</span> <span id="1268">1268</span> <span id="1269">1269</span> <span id="1270">1270</span> <span id="1271">1271</span> <span id="1272">1272</span> <span id="1273">1273</span> <span id="1274">1274</span> <span id="1275">1275</span> <span id="1276">1276</span> <span id="1277">1277</span> <span id="1278">1278</span> <span id="1279">1279</span> <span id="1280">1280</span> <span id="1281">1281</span> <span id="1282">1282</span> <span id="1283">1283</span> <span id="1284">1284</span> <span id="1285">1285</span> <span id="1286">1286</span> <span id="1287">1287</span> <span id="1288">1288</span> <span id="1289">1289</span> <span id="1290">1290</span> <span id="1291">1291</span> <span id="1292">1292</span> <span id="1293">1293</span> <span id="1294">1294</span> <span id="1295">1295</span> <span id="1296">1296</span> <span id="1297">1297</span> <span id="1298">1298</span> <span id="1299">1299</span> <span id="1300">1300</span> <span id="1301">1301</span> <span id="1302">1302</span> <span id="1303">1303</span> <span id="1304">1304</span> <span id="1305">1305</span> <span id="1306">1306</span> <span id="1307">1307</span> <span id="1308">1308</span> <span id="1309">1309</span> <span id="1310">1310</span> <span id="1311">1311</span> <span id="1312">1312</span> <span id="1313">1313</span> <span id="1314">1314</span> <span id="1315">1315</span> <span id="1316">1316</span> <span id="1317">1317</span> <span id="1318">1318</span> <span id="1319">1319</span> <span id="1320">1320</span> <span id="1321">1321</span> <span id="1322">1322</span> <span id="1323">1323</span> <span id="1324">1324</span> <span id="1325">1325</span> <span id="1326">1326</span> <span id="1327">1327</span> <span id="1328">1328</span> <span id="1329">1329</span> <span id="1330">1330</span> <span id="1331">1331</span> <span id="1332">1332</span> <span id="1333">1333</span> <span id="1334">1334</span> <span id="1335">1335</span> <span id="1336">1336</span> <span id="1337">1337</span> <span id="1338">1338</span> <span id="1339">1339</span> <span id="1340">1340</span> <span id="1341">1341</span> <span id="1342">1342</span> <span id="1343">1343</span> <span id="1344">1344</span> <span id="1345">1345</span> <span id="1346">1346</span> <span id="1347">1347</span> <span id="1348">1348</span> <span id="1349">1349</span> <span id="1350">1350</span> <span id="1351">1351</span> <span id="1352">1352</span> <span id="1353">1353</span> <span id="1354">1354</span> <span id="1355">1355</span> <span id="1356">1356</span> <span id="1357">1357</span> <span id="1358">1358</span> <span id="1359">1359</span> <span id="1360">1360</span> <span id="1361">1361</span> <span id="1362">1362</span> <span id="1363">1363</span> <span id="1364">1364</span> <span id="1365">1365</span> <span id="1366">1366</span> <span id="1367">1367</span> <span id="1368">1368</span> <span id="1369">1369</span> <span id="1370">1370</span> <span id="1371">1371</span> <span id="1372">1372</span> <span id="1373">1373</span> <span id="1374">1374</span> <span id="1375">1375</span> <span id="1376">1376</span> <span id="1377">1377</span> <span id="1378">1378</span> <span id="1379">1379</span> <span id="1380">1380</span> <span id="1381">1381</span> <span id="1382">1382</span> <span id="1383">1383</span> <span id="1384">1384</span> <span id="1385">1385</span> <span id="1386">1386</span> <span id="1387">1387</span> <span id="1388">1388</span> <span id="1389">1389</span> <span id="1390">1390</span> <span id="1391">1391</span> <span id="1392">1392</span> <span id="1393">1393</span> <span id="1394">1394</span> <span id="1395">1395</span> <span id="1396">1396</span> <span id="1397">1397</span> <span id="1398">1398</span> <span id="1399">1399</span> <span id="1400">1400</span> <span id="1401">1401</span> <span id="1402">1402</span> <span id="1403">1403</span> <span id="1404">1404</span> <span id="1405">1405</span> <span id="1406">1406</span> <span id="1407">1407</span> <span id="1408">1408</span> <span id="1409">1409</span> <span id="1410">1410</span> <span id="1411">1411</span> <span id="1412">1412</span> <span id="1413">1413</span> <span id="1414">1414</span> <span id="1415">1415</span> <span id="1416">1416</span> <span id="1417">1417</span> <span id="1418">1418</span> <span id="1419">1419</span> <span id="1420">1420</span> <span id="1421">1421</span> <span id="1422">1422</span> <span id="1423">1423</span> <span id="1424">1424</span> <span id="1425">1425</span> <span id="1426">1426</span> <span id="1427">1427</span> <span id="1428">1428</span> <span id="1429">1429</span> <span id="1430">1430</span> <span id="1431">1431</span> <span id="1432">1432</span> <span id="1433">1433</span> <span id="1434">1434</span> <span id="1435">1435</span> <span id="1436">1436</span> <span id="1437">1437</span> <span id="1438">1438</span> <span id="1439">1439</span> <span id="1440">1440</span> <span id="1441">1441</span> <span id="1442">1442</span> <span id="1443">1443</span> <span id="1444">1444</span> <span id="1445">1445</span> <span id="1446">1446</span> <span id="1447">1447</span> <span id="1448">1448</span> <span id="1449">1449</span> <span id="1450">1450</span> <span id="1451">1451</span> <span id="1452">1452</span> <span id="1453">1453</span> <span id="1454">1454</span> <span id="1455">1455</span> <span id="1456">1456</span> <span id="1457">1457</span> <span id="1458">1458</span> <span id="1459">1459</span> <span id="1460">1460</span> <span id="1461">1461</span> <span id="1462">1462</span> <span id="1463">1463</span> <span id="1464">1464</span> <span id="1465">1465</span> <span id="1466">1466</span> <span id="1467">1467</span> <span id="1468">1468</span> <span id="1469">1469</span> <span id="1470">1470</span> <span id="1471">1471</span> <span id="1472">1472</span> <span id="1473">1473</span> <span id="1474">1474</span> <span id="1475">1475</span> <span id="1476">1476</span> <span id="1477">1477</span> <span id="1478">1478</span> <span id="1479">1479</span> <span id="1480">1480</span> <span id="1481">1481</span> <span id="1482">1482</span> <span id="1483">1483</span> <span id="1484">1484</span> <span id="1485">1485</span> <span id="1486">1486</span> <span id="1487">1487</span> <span id="1488">1488</span> <span id="1489">1489</span> <span id="1490">1490</span> <span id="1491">1491</span> <span id="1492">1492</span> <span id="1493">1493</span> <span id="1494">1494</span> <span id="1495">1495</span> <span id="1496">1496</span> <span id="1497">1497</span> <span id="1498">1498</span> <span id="1499">1499</span> <span id="1500">1500</span> <span id="1501">1501</span> <span id="1502">1502</span> <span id="1503">1503</span> <span id="1504">1504</span> <span id="1505">1505</span> <span id="1506">1506</span> <span id="1507">1507</span> <span id="1508">1508</span> <span id="1509">1509</span> <span id="1510">1510</span> <span id="1511">1511</span> <span id="1512">1512</span> <span id="1513">1513</span> <span id="1514">1514</span> <span id="1515">1515</span> <span id="1516">1516</span> <span id="1517">1517</span> <span id="1518">1518</span> <span id="1519">1519</span> <span id="1520">1520</span> <span id="1521">1521</span> <span id="1522">1522</span> <span id="1523">1523</span> <span id="1524">1524</span> <span id="1525">1525</span> <span id="1526">1526</span> <span id="1527">1527</span> <span id="1528">1528</span> <span id="1529">1529</span> <span id="1530">1530</span> <span id="1531">1531</span> <span id="1532">1532</span> <span id="1533">1533</span> <span id="1534">1534</span> <span id="1535">1535</span> <span id="1536">1536</span> <span id="1537">1537</span> <span id="1538">1538</span> <span id="1539">1539</span> <span id="1540">1540</span> <span id="1541">1541</span> <span id="1542">1542</span> <span id="1543">1543</span> <span id="1544">1544</span> <span id="1545">1545</span> <span id="1546">1546</span> <span id="1547">1547</span> <span id="1548">1548</span> <span id="1549">1549</span> <span id="1550">1550</span> <span id="1551">1551</span> <span id="1552">1552</span> <span id="1553">1553</span> <span id="1554">1554</span> <span id="1555">1555</span> <span id="1556">1556</span> <span id="1557">1557</span> <span id="1558">1558</span> <span id="1559">1559</span> <span id="1560">1560</span> <span id="1561">1561</span> <span id="1562">1562</span> <span id="1563">1563</span> <span id="1564">1564</span> <span id="1565">1565</span> <span id="1566">1566</span> <span id="1567">1567</span> <span id="1568">1568</span> <span id="1569">1569</span> <span id="1570">1570</span> <span id="1571">1571</span> <span id="1572">1572</span> <span id="1573">1573</span> <span id="1574">1574</span> <span id="1575">1575</span> <span id="1576">1576</span> <span id="1577">1577</span> <span id="1578">1578</span> <span id="1579">1579</span> <span id="1580">1580</span> <span id="1581">1581</span> <span id="1582">1582</span> <span id="1583">1583</span> <span id="1584">1584</span> <span id="1585">1585</span> <span id="1586">1586</span> <span id="1587">1587</span> <span id="1588">1588</span> <span id="1589">1589</span> <span id="1590">1590</span> <span id="1591">1591</span> <span id="1592">1592</span> <span id="1593">1593</span> <span id="1594">1594</span> <span id="1595">1595</span> <span id="1596">1596</span> <span id="1597">1597</span> <span id="1598">1598</span> <span id="1599">1599</span> <span id="1600">1600</span> <span id="1601">1601</span> <span id="1602">1602</span> <span id="1603">1603</span> <span id="1604">1604</span> <span id="1605">1605</span> <span id="1606">1606</span> <span id="1607">1607</span> <span id="1608">1608</span> <span id="1609">1609</span> <span id="1610">1610</span> <span id="1611">1611</span> <span id="1612">1612</span> <span id="1613">1613</span> <span id="1614">1614</span> <span id="1615">1615</span> <span id="1616">1616</span> <span id="1617">1617</span> <span id="1618">1618</span> <span id="1619">1619</span> <span id="1620">1620</span> <span id="1621">1621</span> <span id="1622">1622</span> <span id="1623">1623</span> <span id="1624">1624</span> <span id="1625">1625</span> <span id="1626">1626</span> <span id="1627">1627</span> <span id="1628">1628</span> <span id="1629">1629</span> <span id="1630">1630</span> <span id="1631">1631</span> <span id="1632">1632</span> <span id="1633">1633</span> <span id="1634">1634</span> <span id="1635">1635</span> <span id="1636">1636</span> <span id="1637">1637</span> <span id="1638">1638</span> <span id="1639">1639</span> <span id="1640">1640</span> <span id="1641">1641</span> <span id="1642">1642</span> <span id="1643">1643</span> <span id="1644">1644</span> <span id="1645">1645</span> <span id="1646">1646</span> <span id="1647">1647</span> <span id="1648">1648</span> <span id="1649">1649</span> <span id="1650">1650</span> <span id="1651">1651</span> <span id="1652">1652</span> <span id="1653">1653</span> <span id="1654">1654</span> <span id="1655">1655</span> <span id="1656">1656</span> <span id="1657">1657</span> <span id="1658">1658</span> <span id="1659">1659</span> <span id="1660">1660</span> <span id="1661">1661</span> <span id="1662">1662</span> <span id="1663">1663</span> <span id="1664">1664</span> <span id="1665">1665</span> <span id="1666">1666</span> <span id="1667">1667</span> <span id="1668">1668</span> <span id="1669">1669</span> <span id="1670">1670</span> <span id="1671">1671</span> <span id="1672">1672</span> <span id="1673">1673</span> <span id="1674">1674</span> <span id="1675">1675</span> <span id="1676">1676</span> <span id="1677">1677</span> <span id="1678">1678</span> <span id="1679">1679</span> <span id="1680">1680</span> <span id="1681">1681</span> <span id="1682">1682</span> <span id="1683">1683</span> <span id="1684">1684</span> <span id="1685">1685</span> <span id="1686">1686</span> <span id="1687">1687</span> <span id="1688">1688</span> <span id="1689">1689</span> <span id="1690">1690</span> <span id="1691">1691</span> <span id="1692">1692</span> <span id="1693">1693</span> <span id="1694">1694</span> <span id="1695">1695</span> <span id="1696">1696</span> <span id="1697">1697</span> <span id="1698">1698</span> <span id="1699">1699</span> <span id="1700">1700</span> <span id="1701">1701</span> <span id="1702">1702</span> <span id="1703">1703</span> <span id="1704">1704</span> <span id="1705">1705</span> <span id="1706">1706</span> <span id="1707">1707</span> <span id="1708">1708</span> <span id="1709">1709</span> <span id="1710">1710</span> <span id="1711">1711</span> <span id="1712">1712</span> <span id="1713">1713</span> <span id="1714">1714</span> <span id="1715">1715</span> <span id="1716">1716</span> <span id="1717">1717</span> <span id="1718">1718</span> <span id="1719">1719</span> <span id="1720">1720</span> <span id="1721">1721</span> <span id="1722">1722</span> <span id="1723">1723</span> <span id="1724">1724</span> <span id="1725">1725</span> <span id="1726">1726</span> <span id="1727">1727</span> <span id="1728">1728</span> <span id="1729">1729</span> <span id="1730">1730</span> <span id="1731">1731</span> <span id="1732">1732</span> <span id="1733">1733</span> <span id="1734">1734</span> <span id="1735">1735</span> <span id="1736">1736</span> <span id="1737">1737</span> <span id="1738">1738</span> <span id="1739">1739</span> <span id="1740">1740</span> <span id="1741">1741</span> <span id="1742">1742</span> <span id="1743">1743</span> <span id="1744">1744</span> <span id="1745">1745</span> <span id="1746">1746</span> <span id="1747">1747</span> <span id="1748">1748</span> <span id="1749">1749</span> <span id="1750">1750</span> <span id="1751">1751</span> <span id="1752">1752</span> <span id="1753">1753</span> <span id="1754">1754</span> <span id="1755">1755</span> <span id="1756">1756</span> <span id="1757">1757</span> <span id="1758">1758</span> <span id="1759">1759</span> <span id="1760">1760</span> <span id="1761">1761</span> <span id="1762">1762</span> <span id="1763">1763</span> <span id="1764">1764</span> <span id="1765">1765</span> <span id="1766">1766</span> <span id="1767">1767</span> <span id="1768">1768</span> <span id="1769">1769</span> <span id="1770">1770</span> <span id="1771">1771</span> <span id="1772">1772</span> <span id="1773">1773</span> <span id="1774">1774</span> <span id="1775">1775</span> <span id="1776">1776</span> <span id="1777">1777</span> <span id="1778">1778</span> <span id="1779">1779</span> <span id="1780">1780</span> <span id="1781">1781</span> <span id="1782">1782</span> <span id="1783">1783</span> <span id="1784">1784</span> <span id="1785">1785</span> <span id="1786">1786</span> <span id="1787">1787</span> <span id="1788">1788</span> <span id="1789">1789</span> <span id="1790">1790</span> <span id="1791">1791</span> <span id="1792">1792</span> <span id="1793">1793</span> <span id="1794">1794</span> <span id="1795">1795</span> <span id="1796">1796</span> <span id="1797">1797</span> <span id="1798">1798</span> <span id="1799">1799</span> <span id="1800">1800</span> <span id="1801">1801</span> <span id="1802">1802</span> <span id="1803">1803</span> <span id="1804">1804</span> <span id="1805">1805</span> <span id="1806">1806</span> <span id="1807">1807</span> <span id="1808">1808</span> <span id="1809">1809</span> <span id="1810">1810</span> <span id="1811">1811</span> <span id="1812">1812</span> <span id="1813">1813</span> <span id="1814">1814</span> <span id="1815">1815</span> <span id="1816">1816</span> <span id="1817">1817</span> <span id="1818">1818</span> <span id="1819">1819</span> <span id="1820">1820</span> <span id="1821">1821</span> <span id="1822">1822</span> <span id="1823">1823</span> <span id="1824">1824</span> <span id="1825">1825</span> <span id="1826">1826</span> <span id="1827">1827</span> <span id="1828">1828</span> </pre><pre class="rust "> <span class="comment">// Copyright 2013-2015 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="doccomment">//! Utilities for formatting and printing strings.</span> <span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">use</span> <span class="ident">cell</span>::{<span class="ident">UnsafeCell</span>, <span class="ident">Cell</span>, <span class="ident">RefCell</span>, <span class="ident">Ref</span>, <span class="ident">RefMut</span>}; <span class="kw">use</span> <span class="ident">marker</span>::<span class="ident">PhantomData</span>; <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">num</span>::<span class="ident">flt2dec</span>; <span class="kw">use</span> <span class="ident">ops</span>::<span class="ident">Deref</span>; <span class="kw">use</span> <span class="ident">result</span>; <span class="kw">use</span> <span class="ident">slice</span>; <span class="kw">use</span> <span class="ident">str</span>; <span class="kw">mod</span> <span class="ident">float</span>; <span class="kw">mod</span> <span class="ident">num</span>; <span class="kw">mod</span> <span class="ident">builders</span>; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27726"</span>)]</span> <span class="doccomment">/// Possible alignments returned by `Formatter::align`</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Alignment</span> { <span class="doccomment">/// Indication that contents should be left-aligned.</span> <span class="ident">Left</span>, <span class="doccomment">/// Indication that contents should be right-aligned.</span> <span class="ident">Right</span>, <span class="doccomment">/// Indication that contents should be center-aligned.</span> <span class="ident">Center</span>, <span class="doccomment">/// No alignment was requested.</span> <span class="ident">Unknown</span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">builders</span>::{<span class="ident">DebugStruct</span>, <span class="ident">DebugTuple</span>, <span class="ident">DebugSet</span>, <span class="ident">DebugList</span>, <span class="ident">DebugMap</span>}; <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">rt</span> { <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">v1</span>; } <span class="doccomment">/// The type returned by formatter methods.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// #[derive(Debug)]</span> <span class="doccomment">/// struct Triangle {</span> <span class="doccomment">/// a: f32,</span> <span class="doccomment">/// b: f32,</span> <span class="doccomment">/// c: f32</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Display for Triangle {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// write!(f, "({}, {}, {})", self.a, self.b, self.c)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let pythagorean_triple = Triangle { a: 3.0, b: 4.0, c: 5.0 };</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("{}", pythagorean_triple);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">type</span> <span class="prelude-ty">Result</span> <span class="op">=</span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Error</span><span class="op">></span>; <span class="doccomment">/// The error type which is returned from formatting a message into a stream.</span> <span class="doccomment">///</span> <span class="doccomment">/// This type does not support transmission of an error other than that an error</span> <span class="doccomment">/// occurred. Any extra information must be arranged to be transmitted through</span> <span class="doccomment">/// some other means.</span> <span class="doccomment">///</span> <span class="doccomment">/// An important thing to remember is that the type `fmt::Error` should not be</span> <span class="doccomment">/// confused with [`std::io::Error`] or [`std::error::Error`], which you may also</span> <span class="doccomment">/// have in scope.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`std::io::Error`]: ../../std/io/struct.Error.html</span> <span class="doccomment">/// [`std::error::Error`]: ../../std/error/trait.Error.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// use std::fmt::{self, write};</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut output = String::new();</span> <span class="doccomment">/// match write(&mut output, format_args!("Hello {}!", "world")) {</span> <span class="doccomment">/// Err(fmt::Error) => panic!("An error occurred"),</span> <span class="doccomment">/// _ => (),</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Default</span>, <span class="ident">Eq</span>, <span class="ident">Hash</span>, <span class="ident">Ord</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Error</span>; <span class="doccomment">/// A collection of methods that are required to format a message into a stream.</span> <span class="doccomment">///</span> <span class="doccomment">/// This trait is the type which this modules requires when formatting</span> <span class="doccomment">/// information. This is similar to the standard library's [`io::Write`] trait,</span> <span class="doccomment">/// but it is only intended for use in libcore.</span> <span class="doccomment">///</span> <span class="doccomment">/// This trait should generally not be implemented by consumers of the standard</span> <span class="doccomment">/// library. The [`write!`] macro accepts an instance of [`io::Write`], and the</span> <span class="doccomment">/// [`io::Write`] trait is favored over implementing this trait.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`write!`]: ../../std/macro.write.html</span> <span class="doccomment">/// [`io::Write`]: ../../std/io/trait.Write.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Write</span> { <span class="doccomment">/// Writes a slice of bytes into this writer, returning whether the write</span> <span class="doccomment">/// succeeded.</span> <span class="doccomment">///</span> <span class="doccomment">/// This method can only succeed if the entire byte slice was successfully</span> <span class="doccomment">/// written, and this method will not return until all data has been</span> <span class="doccomment">/// written or an error occurs.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Errors</span> <span class="doccomment">///</span> <span class="doccomment">/// This function will return an instance of [`Error`] on error.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`Error`]: struct.Error.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt::{Error, Write};</span> <span class="doccomment">///</span> <span class="doccomment">/// fn writer<W: Write>(f: &mut W, s: &str) -> Result<(), Error> {</span> <span class="doccomment">/// f.write_str(s)</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = String::new();</span> <span class="doccomment">/// writer(&mut buf, "hola").unwrap();</span> <span class="doccomment">/// assert_eq!(&buf, "hola");</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; <span class="doccomment">/// Writes a [`char`] into this writer, returning whether the write succeeded.</span> <span class="doccomment">///</span> <span class="doccomment">/// A single [`char`] may be encoded as more than one byte.</span> <span class="doccomment">/// This method can only succeed if the entire byte sequence was successfully</span> <span class="doccomment">/// written, and this method will not return until all data has been</span> <span class="doccomment">/// written or an error occurs.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Errors</span> <span class="doccomment">///</span> <span class="doccomment">/// This function will return an instance of [`Error`] on error.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span> <span class="doccomment">/// [`Error`]: struct.Error.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt::{Error, Write};</span> <span class="doccomment">///</span> <span class="doccomment">/// fn writer<W: Write>(f: &mut W, c: char) -> Result<(), Error> {</span> <span class="doccomment">/// f.write_char(c)</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = String::new();</span> <span class="doccomment">/// writer(&mut buf, 'a').unwrap();</span> <span class="doccomment">/// writer(&mut buf, 'b').unwrap();</span> <span class="doccomment">/// assert_eq!(&buf, "ab");</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_write_char"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.1.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="ident">write_str</span>(<span class="ident">c</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">4</span>])) } <span class="doccomment">/// Glue for usage of the [`write!`] macro with implementors of this trait.</span> <span class="doccomment">///</span> <span class="doccomment">/// This method should generally not be invoked manually, but rather through</span> <span class="doccomment">/// the [`write!`] macro itself.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`write!`]: ../../std/macro.write.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt::{Error, Write};</span> <span class="doccomment">///</span> <span class="doccomment">/// fn writer<W: Write>(f: &mut W, s: &str) -> Result<(), Error> {</span> <span class="doccomment">/// f.write_fmt(format_args!("{}", s))</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut buf = String::new();</span> <span class="doccomment">/// writer(&mut buf, "world").unwrap();</span> <span class="doccomment">/// assert_eq!(&buf, "world");</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="comment">// This Adapter is needed to allow `self` (of type `&mut</span> <span class="comment">// Self`) to be cast to a Write (below) without</span> <span class="comment">// requiring a `Sized` bound.</span> <span class="kw">struct</span> <span class="ident">Adapter</span><span class="op"><</span><span class="lifetime">'a</span>,<span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>); <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Adapter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Write</span> { <span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">write_str</span>(<span class="ident">s</span>) } <span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">write_char</span>(<span class="ident">c</span>) } <span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">write_fmt</span>(<span class="ident">args</span>) } } <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Adapter</span>(<span class="self">self</span>), <span class="ident">args</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_write_blanket_impl"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">W</span>: <span class="ident">Write</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">W</span> { <span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">write_str</span>(<span class="ident">s</span>) } <span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">write_char</span>(<span class="ident">c</span>) } <span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">write_fmt</span>(<span class="ident">args</span>) } } <span class="doccomment">/// A struct to represent both where to emit formatting strings to and how they</span> <span class="doccomment">/// should be formatted. A mutable version of this is passed to all formatting</span> <span class="doccomment">/// traits.</span> <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="ident">flags</span>: <span class="ident">u32</span>, <span class="ident">fill</span>: <span class="ident">char</span>, <span class="ident">align</span>: <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>, <span class="ident">width</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, <span class="ident">precision</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> (<span class="ident">Write</span><span class="op">+</span><span class="lifetime">'a</span>), <span class="ident">curarg</span>: <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">>></span>, <span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>], } <span class="comment">// NB. Argument is essentially an optimized partially applied formatting function,</span> <span class="comment">// equivalent to `exists T.(&T, fn(&T, &mut Formatter) -> Result`.</span> <span class="kw">struct</span> <span class="ident">Void</span> { <span class="ident">_priv</span>: (), <span class="doccomment">/// Erases all oibits, because `Void` erases the type of the object that</span> <span class="doccomment">/// will be used to produce formatted output. Since we do not know what</span> <span class="doccomment">/// oibits the real types have (and they can have any or none), we need to</span> <span class="doccomment">/// take the most conservative approach and forbid all oibits.</span> <span class="doccomment">///</span> <span class="doccomment">/// It was added after #45197 showed that one could share a `!Sync`</span> <span class="doccomment">/// object across threads by passing it into `format_args!`.</span> <span class="ident">_oibit_remover</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">Fn</span>()<span class="op">></span>, } <span class="doccomment">/// This struct represents the generic "argument" which is taken by the Xprintf</span> <span class="doccomment">/// family of functions. It contains a function to format the given value. At</span> <span class="doccomment">/// compile time it is ensured that the function and the value have the correct</span> <span class="doccomment">/// types, and then this struct is used to canonicalize arguments to one type.</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>)]</span> <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="ident">value</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Void</span>, <span class="ident">formatter</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">Void</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>, } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="kw-2">*</span><span class="self">self</span> } } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span> <span class="kw">fn</span> <span class="ident">show_usize</span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">usize</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="ident">x</span>, <span class="ident">f</span>) } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">T</span>, <span class="ident">f</span>: <span class="kw">fn</span>(<span class="kw-2">&</span><span class="ident">T</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>) <span class="op">-></span> <span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> { <span class="kw">unsafe</span> { <span class="ident">ArgumentV1</span> { <span class="ident">formatter</span>: <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">f</span>), <span class="ident">value</span>: <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">x</span>) } } } <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">usize</span>) <span class="op">-></span> <span class="ident">ArgumentV1</span> { <span class="ident">ArgumentV1</span>::<span class="ident">new</span>(<span class="ident">x</span>, <span class="ident">ArgumentV1</span>::<span class="ident">show_usize</span>) } <span class="kw">fn</span> <span class="ident">as_usize</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">formatter</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="ident">ArgumentV1</span>::<span class="ident">show_usize</span> <span class="kw">as</span> <span class="ident">usize</span> { <span class="prelude-val">Some</span>(<span class="kw">unsafe</span> { <span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">value</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _ <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>) }) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } } <span class="comment">// flags available in the v1 format of format_args</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span> <span class="kw">enum</span> <span class="ident">FlagV1</span> { <span class="ident">SignPlus</span>, <span class="ident">SignMinus</span>, <span class="ident">Alternate</span>, <span class="ident">SignAwareZeroPad</span>, } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="doccomment">/// When using the format_args!() macro, this function is used to generate the</span> <span class="doccomment">/// Arguments structure.</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_v1</span>(<span class="ident">pieces</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>], <span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>]) <span class="op">-></span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="ident">Arguments</span> { <span class="ident">pieces</span>, <span class="ident">fmt</span>: <span class="prelude-val">None</span>, <span class="ident">args</span>, } } <span class="doccomment">/// This function is used to specify nonstandard formatting parameters.</span> <span class="doccomment">/// The `pieces` array must be at least as long as `fmt` to construct</span> <span class="doccomment">/// a valid Arguments structure. Also, any `Count` within `fmt` that is</span> <span class="doccomment">/// `CountIsParam` or `CountIsNextParam` has to point to an argument</span> <span class="doccomment">/// created with `argumentusize`. However, failing to do so doesn't cause</span> <span class="doccomment">/// unsafety, but will ignore invalid .</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_v1_formatted</span>(<span class="ident">pieces</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>], <span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>], <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Argument</span>]) <span class="op">-></span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="ident">Arguments</span> { <span class="ident">pieces</span>, <span class="ident">fmt</span>: <span class="prelude-val">Some</span>(<span class="ident">fmt</span>), <span class="ident">args</span>, } } <span class="doccomment">/// Estimates the length of the formatted text.</span> <span class="doccomment">///</span> <span class="doccomment">/// This is intended to be used for setting initial `String` capacity</span> <span class="doccomment">/// when using `format!`. Note: this is neither the lower nor upper bound.</span> <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span> <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_internals"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"internal to format_args!"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">estimated_capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="kw">let</span> <span class="ident">pieces_length</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pieces</span>.<span class="ident">iter</span>() .<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span>.<span class="ident">len</span>()).<span class="ident">sum</span>(); <span class="kw">if</span> <span class="self">self</span>.<span class="ident">args</span>.<span class="ident">is_empty</span>() { <span class="ident">pieces_length</span> } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">pieces</span>[<span class="number">0</span>] <span class="op">==</span> <span class="string">""</span> <span class="op">&&</span> <span class="ident">pieces_length</span> <span class="op"><</span> <span class="number">16</span> { <span class="comment">// If the format string starts with an argument,</span> <span class="comment">// don't preallocate anything, unless length</span> <span class="comment">// of pieces is significant.</span> <span class="number">0</span> } <span class="kw">else</span> { <span class="comment">// There are some arguments, so any additional push</span> <span class="comment">// will reallocate the string. To avoid that,</span> <span class="comment">// we're "pre-doubling" the capacity here.</span> <span class="ident">pieces_length</span>.<span class="ident">checked_mul</span>(<span class="number">2</span>).<span class="ident">unwrap_or</span>(<span class="number">0</span>) } } } <span class="doccomment">/// This structure represents a safely precompiled version of a format string</span> <span class="doccomment">/// and its arguments. This cannot be generated at runtime because it cannot</span> <span class="doccomment">/// safely be done, so no constructors are given and the fields are private</span> <span class="doccomment">/// to prevent modification.</span> <span class="doccomment">///</span> <span class="doccomment">/// The [`format_args!`] macro will safely create an instance of this structure</span> <span class="doccomment">/// and pass it to a function or closure, passed as the first argument. The</span> <span class="doccomment">/// macro validates the format string at compile-time so usage of the [`write`]</span> <span class="doccomment">/// and [`format`] functions can be safely performed.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`format_args!`]: ../../std/macro.format_args.html</span> <span class="doccomment">/// [`format`]: ../../std/fmt/fn.format.html</span> <span class="doccomment">/// [`write`]: ../../std/fmt/fn.write.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="comment">// Format string pieces to print.</span> <span class="ident">pieces</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>], <span class="comment">// Placeholder specs, or `None` if all specs are default (as in "{}{}").</span> <span class="ident">fmt</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Argument</span>]<span class="op">></span>, <span class="comment">// Dynamic arguments for interpolation, to be interleaved with string</span> <span class="comment">// pieces. (Every argument is preceded by a string piece.)</span> <span class="ident">args</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">ArgumentV1</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>], } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">fmt</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">write</span>(<span class="ident">fmt</span>.<span class="ident">buf</span>, <span class="kw-2">*</span><span class="self">self</span>) } } <span class="doccomment">/// `?` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// `Debug` should format the output in a programmer-facing, debugging context.</span> <span class="doccomment">///</span> <span class="doccomment">/// Generally speaking, you should just `derive` a `Debug` implementation.</span> <span class="doccomment">///</span> <span class="doccomment">/// When used with the alternate format specifier `#?`, the output is pretty-printed.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// This trait can be used with `#[derive]` if all fields implement `Debug`. When</span> <span class="doccomment">/// `derive`d for structs, it will use the name of the `struct`, then `{`, then a</span> <span class="doccomment">/// comma-separated list of each field's name and `Debug` value, then `}`. For</span> <span class="doccomment">/// `enum`s, it will use the name of the variant and, if applicable, `(`, then the</span> <span class="doccomment">/// `Debug` values of the fields, then `)`.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Deriving an implementation:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// #[derive(Debug)]</span> <span class="doccomment">/// struct Point {</span> <span class="doccomment">/// x: i32,</span> <span class="doccomment">/// y: i32,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("The origin is: {:?}", origin);</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Manually implementing:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Point {</span> <span class="doccomment">/// x: i32,</span> <span class="doccomment">/// y: i32,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Point {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// write!(f, "Point {{ x: {}, y: {} }}", self.x, self.y)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("The origin is: {:?}", origin);</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// This outputs:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```text</span> <span class="doccomment">/// The origin is: Point { x: 0, y: 0 }</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// There are a number of `debug_*` methods on [`Formatter`] to help you with manual</span> <span class="doccomment">/// implementations, such as [`debug_struct`][debug_struct].</span> <span class="doccomment">///</span> <span class="doccomment">/// `Debug` implementations using either `derive` or the debug builder API</span> <span class="doccomment">/// on [`Formatter`] support pretty printing using the alternate flag: `{:#?}`.</span> <span class="doccomment">///</span> <span class="doccomment">/// [debug_struct]: ../../std/fmt/struct.Formatter.html#method.debug_struct</span> <span class="doccomment">/// [`Formatter`]: ../../std/fmt/struct.Formatter.html</span> <span class="doccomment">///</span> <span class="doccomment">/// Pretty printing with `#?`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// #[derive(Debug)]</span> <span class="doccomment">/// struct Point {</span> <span class="doccomment">/// x: i32,</span> <span class="doccomment">/// y: i32,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("The origin is: {:#?}", origin);</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// This outputs:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```text</span> <span class="doccomment">/// The origin is: Point {</span> <span class="doccomment">/// x: 0,</span> <span class="doccomment">/// y: 0</span> <span class="doccomment">/// }</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">rustc_on_unimplemented</span>( <span class="ident">on</span>(<span class="ident">crate_local</span>, <span class="ident">label</span><span class="op">=</span><span class="string">"`{Self}` cannot be formatted using `:?`; \ add `#[derive(Debug)]` or manually implement `{Debug}`"</span>), <span class="ident">message</span><span class="op">=</span><span class="string">"`{Self}` doesn't implement `{Debug}`"</span>, <span class="ident">label</span><span class="op">=</span><span class="string">"`{Self}` cannot be formatted using `:?` because it doesn't implement `{Debug}`"</span>, )]</span> <span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"debug_trait"</span>]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Debug</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Position {</span> <span class="doccomment">/// longitude: f32,</span> <span class="doccomment">/// latitude: f32,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Position {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// write!(f, "({:?}, {:?})", self.longitude, self.latitude)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!("(1.987, 2.983)".to_owned(),</span> <span class="doccomment">/// format!("{:?}", Position { longitude: 1.987, latitude: 2.983, }));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// Format trait for an empty format, `{}`.</span> <span class="doccomment">///</span> <span class="doccomment">/// `Display` is similar to [`Debug`][debug], but `Display` is for user-facing</span> <span class="doccomment">/// output, and so cannot be derived.</span> <span class="doccomment">///</span> <span class="doccomment">/// [debug]: trait.Debug.html</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `Display` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Point {</span> <span class="doccomment">/// x: i32,</span> <span class="doccomment">/// y: i32,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Display for Point {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// write!(f, "({}, {})", self.x, self.y)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let origin = Point { x: 0, y: 0 };</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("The origin is: {}", origin);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">rustc_on_unimplemented</span>( <span class="ident">message</span><span class="op">=</span><span class="string">"`{Self}` doesn't implement `{Display}`"</span>, <span class="ident">label</span><span class="op">=</span><span class="string">"`{Self}` cannot be formatted with the default formatter; \ try using `:?` instead if you are using a format string"</span>, )]</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Display</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Position {</span> <span class="doccomment">/// longitude: f32,</span> <span class="doccomment">/// latitude: f32,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Display for Position {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// write!(f, "({}, {})", self.longitude, self.latitude)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!("(1.987, 2.983)".to_owned(),</span> <span class="doccomment">/// format!("{}", Position { longitude: 1.987, latitude: 2.983, }));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `o` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `Octal` trait should format its output as a number in base-8.</span> <span class="doccomment">///</span> <span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span> <span class="doccomment">/// negative values are formatted as the two’s complement representation.</span> <span class="doccomment">///</span> <span class="doccomment">/// The alternate flag, `#`, adds a `0o` in front of the output.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `i32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = 42; // 42 is '52' in octal</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:o}", x), "52");</span> <span class="doccomment">/// assert_eq!(format!("{:#o}", x), "0o52");</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:o}", -16), "37777777760");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `Octal` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Octal for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// let val = self.0;</span> <span class="doccomment">///</span> <span class="doccomment">/// write!(f, "{:o}", val) // delegate to i32's implementation</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(9);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l as octal is: {:o}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Octal</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `b` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `Binary` trait should format its output as a number in binary.</span> <span class="doccomment">///</span> <span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span> <span class="doccomment">/// negative values are formatted as the two’s complement representation.</span> <span class="doccomment">///</span> <span class="doccomment">/// The alternate flag, `#`, adds a `0b` in front of the output.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `i32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = 42; // 42 is '101010' in binary</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:b}", x), "101010");</span> <span class="doccomment">/// assert_eq!(format!("{:#b}", x), "0b101010");</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:b}", -16), "11111111111111111111111111110000");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `Binary` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Binary for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// let val = self.0;</span> <span class="doccomment">///</span> <span class="doccomment">/// write!(f, "{:b}", val) // delegate to i32's implementation</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(107);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l as binary is: {:b}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Binary</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `x` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `LowerHex` trait should format its output as a number in hexadecimal, with `a` through `f`</span> <span class="doccomment">/// in lower case.</span> <span class="doccomment">///</span> <span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span> <span class="doccomment">/// negative values are formatted as the two’s complement representation.</span> <span class="doccomment">///</span> <span class="doccomment">/// The alternate flag, `#`, adds a `0x` in front of the output.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `i32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = 42; // 42 is '2a' in hex</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:x}", x), "2a");</span> <span class="doccomment">/// assert_eq!(format!("{:#x}", x), "0x2a");</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:x}", -16), "fffffff0");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `LowerHex` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::LowerHex for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// let val = self.0;</span> <span class="doccomment">///</span> <span class="doccomment">/// write!(f, "{:x}", val) // delegate to i32's implementation</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(9);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l as hex is: {:x}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">LowerHex</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `X` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `UpperHex` trait should format its output as a number in hexadecimal, with `A` through `F`</span> <span class="doccomment">/// in upper case.</span> <span class="doccomment">///</span> <span class="doccomment">/// For primitive signed integers (`i8` to `i128`, and `isize`),</span> <span class="doccomment">/// negative values are formatted as the two’s complement representation.</span> <span class="doccomment">///</span> <span class="doccomment">/// The alternate flag, `#`, adds a `0x` in front of the output.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `i32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = 42; // 42 is '2A' in hex</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:X}", x), "2A");</span> <span class="doccomment">/// assert_eq!(format!("{:#X}", x), "0x2A");</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:X}", -16), "FFFFFFF0");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `UpperHex` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::UpperHex for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// let val = self.0;</span> <span class="doccomment">///</span> <span class="doccomment">/// write!(f, "{:X}", val) // delegate to i32's implementation</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(9);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l as hex is: {:X}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">UpperHex</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `p` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `Pointer` trait should format its output as a memory location. This is commonly presented</span> <span class="doccomment">/// as hexadecimal.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `&i32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = &42;</span> <span class="doccomment">///</span> <span class="doccomment">/// let address = format!("{:p}", x); // this produces something like '0x7f06092ac6d0'</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `Pointer` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Pointer for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// // use `as` to convert to a `*const T`, which implements Pointer, which we can use</span> <span class="doccomment">///</span> <span class="doccomment">/// write!(f, "{:p}", self as *const Length)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(42);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l is in memory here: {:p}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Pointer</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `e` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `LowerExp` trait should format its output in scientific notation with a lower-case `e`.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `i32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = 42.0; // 42.0 is '4.2e1' in scientific notation</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:e}", x), "4.2e1");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `LowerExp` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::LowerExp for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// let val = self.0;</span> <span class="doccomment">/// write!(f, "{}e1", val / 10)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(100);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l in scientific notation is: {:e}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">LowerExp</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// `E` formatting.</span> <span class="doccomment">///</span> <span class="doccomment">/// The `UpperExp` trait should format its output in scientific notation with an upper-case `E`.</span> <span class="doccomment">///</span> <span class="doccomment">/// For more information on formatters, see [the module-level documentation][module].</span> <span class="doccomment">///</span> <span class="doccomment">/// [module]: ../../std/fmt/index.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage with `f32`:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// let x = 42.0; // 42.0 is '4.2E1' in scientific notation</span> <span class="doccomment">///</span> <span class="doccomment">/// assert_eq!(format!("{:E}", x), "4.2E1");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Implementing `UpperExp` on a type:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Length(i32);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::UpperExp for Length {</span> <span class="doccomment">/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// let val = self.0;</span> <span class="doccomment">/// write!(f, "{}E1", val / 10)</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// let l = Length(100);</span> <span class="doccomment">///</span> <span class="doccomment">/// println!("l in scientific notation is: {:E}", l);</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">UpperExp</span> { <span class="doccomment">/// Formats the value using the given formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>; } <span class="doccomment">/// The `write` function takes an output stream, and an `Arguments` struct</span> <span class="doccomment">/// that can be precompiled with the `format_args!` macro.</span> <span class="doccomment">///</span> <span class="doccomment">/// The arguments will be formatted according to the specified format string</span> <span class="doccomment">/// into the output stream provided.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// Basic usage:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut output = String::new();</span> <span class="doccomment">/// fmt::write(&mut output, format_args!("Hello {}!", "world"))</span> <span class="doccomment">/// .expect("Error occurred while trying to write in String");</span> <span class="doccomment">/// assert_eq!(output, "Hello world!");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// Please note that using [`write!`] might be preferable. Example:</span> <span class="doccomment">///</span> <span class="doccomment">/// ```</span> <span class="doccomment">/// use std::fmt::Write;</span> <span class="doccomment">///</span> <span class="doccomment">/// let mut output = String::new();</span> <span class="doccomment">/// write!(&mut output, "Hello {}!", "world")</span> <span class="doccomment">/// .expect("Error occurred while trying to write in String");</span> <span class="doccomment">/// assert_eq!(output, "Hello world!");</span> <span class="doccomment">/// ```</span> <span class="doccomment">///</span> <span class="doccomment">/// [`write!`]: ../../std/macro.write.html</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write</span>(<span class="ident">output</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Write</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">formatter</span> <span class="op">=</span> <span class="ident">Formatter</span> { <span class="ident">flags</span>: <span class="number">0</span>, <span class="ident">width</span>: <span class="prelude-val">None</span>, <span class="ident">precision</span>: <span class="prelude-val">None</span>, <span class="ident">buf</span>: <span class="ident">output</span>, <span class="ident">align</span>: <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span>, <span class="ident">fill</span>: <span class="string">' '</span>, <span class="ident">args</span>: <span class="ident">args</span>.<span class="ident">args</span>, <span class="ident">curarg</span>: <span class="ident">args</span>.<span class="ident">args</span>.<span class="ident">iter</span>(), }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pieces</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">pieces</span>.<span class="ident">iter</span>(); <span class="kw">match</span> <span class="ident">args</span>.<span class="ident">fmt</span> { <span class="prelude-val">None</span> <span class="op">=></span> { <span class="comment">// We can use default formatting parameters for all arguments.</span> <span class="kw">for</span> (<span class="ident">arg</span>, <span class="ident">piece</span>) <span class="kw">in</span> <span class="ident">args</span>.<span class="ident">args</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">pieces</span>.<span class="ident">by_ref</span>()) { <span class="ident">formatter</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">*</span><span class="ident">piece</span>)<span class="question-mark">?</span>; (<span class="ident">arg</span>.<span class="ident">formatter</span>)(<span class="ident">arg</span>.<span class="ident">value</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">formatter</span>)<span class="question-mark">?</span>; } } <span class="prelude-val">Some</span>(<span class="ident">fmt</span>) <span class="op">=></span> { <span class="comment">// Every spec has a corresponding argument that is preceded by</span> <span class="comment">// a string piece.</span> <span class="kw">for</span> (<span class="ident">arg</span>, <span class="ident">piece</span>) <span class="kw">in</span> <span class="ident">fmt</span>.<span class="ident">iter</span>().<span class="ident">zip</span>(<span class="ident">pieces</span>.<span class="ident">by_ref</span>()) { <span class="ident">formatter</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">*</span><span class="ident">piece</span>)<span class="question-mark">?</span>; <span class="ident">formatter</span>.<span class="ident">run</span>(<span class="ident">arg</span>)<span class="question-mark">?</span>; } } } <span class="comment">// There can be only one trailing string piece left.</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">piece</span>) <span class="op">=</span> <span class="ident">pieces</span>.<span class="ident">next</span>() { <span class="ident">formatter</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">*</span><span class="ident">piece</span>)<span class="question-mark">?</span>; } <span class="prelude-val">Ok</span>(()) } <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">wrap_buf</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'c</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">wrap</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'c</span><span class="op">></span> <span class="kw">where</span> <span class="lifetime">'b</span>: <span class="lifetime">'c</span>, <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> (<span class="ident">Write</span><span class="op">+</span><span class="lifetime">'b</span>)) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'c</span> <span class="kw-2">mut</span> (<span class="ident">Write</span><span class="op">+</span><span class="lifetime">'c</span>) { <span class="ident">Formatter</span> { <span class="comment">// We want to change this</span> <span class="ident">buf</span>: <span class="ident">wrap</span>(<span class="self">self</span>.<span class="ident">buf</span>), <span class="comment">// And preserve these</span> <span class="ident">flags</span>: <span class="self">self</span>.<span class="ident">flags</span>, <span class="ident">fill</span>: <span class="self">self</span>.<span class="ident">fill</span>, <span class="ident">align</span>: <span class="self">self</span>.<span class="ident">align</span>, <span class="ident">width</span>: <span class="self">self</span>.<span class="ident">width</span>, <span class="ident">precision</span>: <span class="self">self</span>.<span class="ident">precision</span>, <span class="comment">// These only exist in the struct for the `run` method,</span> <span class="comment">// which won’t be used together with this method.</span> <span class="ident">curarg</span>: <span class="self">self</span>.<span class="ident">curarg</span>.<span class="ident">clone</span>(), <span class="ident">args</span>: <span class="self">self</span>.<span class="ident">args</span>, } } <span class="comment">// First up is the collection of functions used to execute a format string</span> <span class="comment">// at runtime. This consumes all of the compile-time statics generated by</span> <span class="comment">// the format! syntax extension.</span> <span class="kw">fn</span> <span class="ident">run</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">arg</span>: <span class="kw-2">&</span><span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Argument</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="comment">// Fill in the format parameters into the formatter</span> <span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">fill</span>; <span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">align</span>; <span class="self">self</span>.<span class="ident">flags</span> <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">flags</span>; <span class="self">self</span>.<span class="ident">width</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">getcount</span>(<span class="kw-2">&</span><span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">width</span>); <span class="self">self</span>.<span class="ident">precision</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">getcount</span>(<span class="kw-2">&</span><span class="ident">arg</span>.<span class="ident">format</span>.<span class="ident">precision</span>); <span class="comment">// Extract the correct argument</span> <span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">arg</span>.<span class="ident">position</span> { <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Position</span>::<span class="ident">Next</span> <span class="op">=></span> { <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">curarg</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>() } <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Position</span>::<span class="ident">At</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="self">self</span>.<span class="ident">args</span>[<span class="ident">i</span>], }; <span class="comment">// Then actually do some printing</span> (<span class="ident">value</span>.<span class="ident">formatter</span>)(<span class="ident">value</span>.<span class="ident">value</span>, <span class="self">self</span>) } <span class="kw">fn</span> <span class="ident">getcount</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">cnt</span>: <span class="kw-2">&</span><span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">cnt</span> { <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">Is</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">n</span>), <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">Implied</span> <span class="op">=></span> <span class="prelude-val">None</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">Param</span>(<span class="ident">i</span>) <span class="op">=></span> { <span class="self">self</span>.<span class="ident">args</span>[<span class="ident">i</span>].<span class="ident">as_usize</span>() } <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Count</span>::<span class="ident">NextParam</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">curarg</span>.<span class="ident">next</span>().<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">arg</span><span class="op">|</span> <span class="ident">arg</span>.<span class="ident">as_usize</span>()) } } } <span class="comment">// Helper methods used for padding and processing formatting arguments that</span> <span class="comment">// all formatting traits can use.</span> <span class="doccomment">/// Performs the correct padding for an integer which has already been</span> <span class="doccomment">/// emitted into a str. The str should *not* contain the sign for the</span> <span class="doccomment">/// integer, that will be added by this method.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Arguments</span> <span class="doccomment">///</span> <span class="doccomment">/// * is_nonnegative - whether the original integer was either positive or zero.</span> <span class="doccomment">/// * prefix - if the '#' character (Alternate) is provided, this</span> <span class="doccomment">/// is the prefix to put in front of the number.</span> <span class="doccomment">/// * buf - the byte array that the number has been formatted into</span> <span class="doccomment">///</span> <span class="doccomment">/// This function will correctly account for the flags provided as well as</span> <span class="doccomment">/// the minimum width. It will not take precision into account.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pad_integral</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">is_nonnegative</span>: <span class="ident">bool</span>, <span class="ident">prefix</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sign</span> <span class="op">=</span> <span class="prelude-val">None</span>; <span class="kw">if</span> <span class="op">!</span><span class="ident">is_nonnegative</span> { <span class="ident">sign</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="string">'-'</span>); <span class="ident">width</span> <span class="op">+=</span> <span class="number">1</span>; } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">sign_plus</span>() { <span class="ident">sign</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="string">'+'</span>); <span class="ident">width</span> <span class="op">+=</span> <span class="number">1</span>; } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prefixed</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="kw">if</span> <span class="self">self</span>.<span class="ident">alternate</span>() { <span class="ident">prefixed</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">width</span> <span class="op">+=</span> <span class="ident">prefix</span>.<span class="ident">chars</span>().<span class="ident">count</span>(); } <span class="comment">// Writes the sign if it exists, and then the prefix if it was requested</span> <span class="kw">let</span> <span class="ident">write_prefix</span> <span class="op">=</span> <span class="op">|</span><span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span><span class="op">|</span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="ident">sign</span> { <span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">c</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">4</span>]))<span class="question-mark">?</span>; } <span class="kw">if</span> <span class="ident">prefixed</span> { <span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">prefix</span>) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>(()) } }; <span class="comment">// The `width` field is more of a `min-width` parameter at this point.</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">width</span> { <span class="comment">// If there's no minimum length requirements then we can just</span> <span class="comment">// write the bytes.</span> <span class="prelude-val">None</span> <span class="op">=></span> { <span class="ident">write_prefix</span>(<span class="self">self</span>)<span class="question-mark">?</span>; <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>) } <span class="comment">// Check if we're over the minimum width, if so then we can also</span> <span class="comment">// just write the bytes.</span> <span class="prelude-val">Some</span>(<span class="ident">min</span>) <span class="kw">if</span> <span class="ident">width</span> <span class="op">>=</span> <span class="ident">min</span> <span class="op">=></span> { <span class="ident">write_prefix</span>(<span class="self">self</span>)<span class="question-mark">?</span>; <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>) } <span class="comment">// The sign and prefix goes before the padding if the fill character</span> <span class="comment">// is zero</span> <span class="prelude-val">Some</span>(<span class="ident">min</span>) <span class="kw">if</span> <span class="self">self</span>.<span class="ident">sign_aware_zero_pad</span>() <span class="op">=></span> { <span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="string">'0'</span>; <span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>; <span class="ident">write_prefix</span>(<span class="self">self</span>)<span class="question-mark">?</span>; <span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">min</span> <span class="op">-</span> <span class="ident">width</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>, <span class="op">|</span><span class="ident">f</span><span class="op">|</span> { <span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>) }) } <span class="comment">// Otherwise, the sign and prefix goes after the padding</span> <span class="prelude-val">Some</span>(<span class="ident">min</span>) <span class="op">=></span> { <span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">min</span> <span class="op">-</span> <span class="ident">width</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>, <span class="op">|</span><span class="ident">f</span><span class="op">|</span> { <span class="ident">write_prefix</span>(<span class="ident">f</span>)<span class="question-mark">?</span>; <span class="ident">f</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">buf</span>) }) } } } <span class="doccomment">/// This function takes a string slice and emits it to the internal buffer</span> <span class="doccomment">/// after applying the relevant formatting flags specified. The flags</span> <span class="doccomment">/// recognized for generic strings are:</span> <span class="doccomment">///</span> <span class="doccomment">/// * width - the minimum width of what to emit</span> <span class="doccomment">/// * fill/align - what to emit and where to emit it if the string</span> <span class="doccomment">/// provided needs to be padded</span> <span class="doccomment">/// * precision - the maximum length to emit, the string is truncated if it</span> <span class="doccomment">/// is longer than this length</span> <span class="doccomment">///</span> <span class="doccomment">/// Notably this function ignores the `flag` parameters.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pad</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="comment">// Make sure there's a fast path up front</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">width</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="self">self</span>.<span class="ident">precision</span>.<span class="ident">is_none</span>() { <span class="kw">return</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>); } <span class="comment">// The `precision` field can be interpreted as a `max-width` for the</span> <span class="comment">// string being formatted.</span> <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">max</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">precision</span> { <span class="comment">// If our string is longer that the precision, then we must have</span> <span class="comment">// truncation. However other flags like `fill`, `width` and `align`</span> <span class="comment">// must act as always.</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">i</span>, _)) <span class="op">=</span> <span class="ident">s</span>.<span class="ident">char_indices</span>().<span class="ident">skip</span>(<span class="ident">max</span>).<span class="ident">next</span>() { <span class="kw-2">&</span><span class="ident">s</span>[..<span class="ident">i</span>] } <span class="kw">else</span> { <span class="kw-2">&</span><span class="ident">s</span> } } <span class="kw">else</span> { <span class="kw-2">&</span><span class="ident">s</span> }; <span class="comment">// The `width` field is more of a `min-width` parameter at this point.</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">width</span> { <span class="comment">// If we're under the maximum length, and there's no minimum length</span> <span class="comment">// requirements, then we can just emit the string</span> <span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>), <span class="comment">// If we're under the maximum width, check if we're over the minimum</span> <span class="comment">// width, if so it's as easy as just emitting the string.</span> <span class="prelude-val">Some</span>(<span class="ident">width</span>) <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">count</span>() <span class="op">>=</span> <span class="ident">width</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>) } <span class="comment">// If we're under both the maximum and the minimum width, then fill</span> <span class="comment">// up the minimum width with the specified string + some alignment.</span> <span class="prelude-val">Some</span>(<span class="ident">width</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Left</span>; <span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">width</span> <span class="op">-</span> <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">count</span>(), <span class="ident">align</span>, <span class="op">|</span><span class="ident">me</span><span class="op">|</span> { <span class="ident">me</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>) }) } } } <span class="doccomment">/// Runs a callback, emitting the correct padding either before or</span> <span class="doccomment">/// afterwards depending on whether right or left alignment is requested.</span> <span class="kw">fn</span> <span class="ident">with_padding</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">padding</span>: <span class="ident">usize</span>, <span class="ident">default</span>: <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span>, { <span class="kw">let</span> <span class="ident">align</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">align</span> { <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span> <span class="op">=></span> <span class="ident">default</span>, _ <span class="op">=></span> <span class="self">self</span>.<span class="ident">align</span> }; <span class="kw">let</span> (<span class="ident">pre_pad</span>, <span class="ident">post_pad</span>) <span class="op">=</span> <span class="kw">match</span> <span class="ident">align</span> { <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Left</span> <span class="op">=></span> (<span class="number">0</span>, <span class="ident">padding</span>), <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span> <span class="op">|</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span> <span class="op">=></span> (<span class="ident">padding</span>, <span class="number">0</span>), <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Center</span> <span class="op">=></span> (<span class="ident">padding</span> <span class="op">/</span> <span class="number">2</span>, (<span class="ident">padding</span> <span class="op">+</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>), }; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fill</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">4</span>]; <span class="kw">let</span> <span class="ident">fill</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fill</span>); <span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="ident">pre_pad</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">fill</span>)<span class="question-mark">?</span>; } <span class="ident">f</span>(<span class="self">self</span>)<span class="question-mark">?</span>; <span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="ident">post_pad</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">fill</span>)<span class="question-mark">?</span>; } <span class="prelude-val">Ok</span>(()) } <span class="doccomment">/// Takes the formatted parts and applies the padding.</span> <span class="doccomment">/// Assumes that the caller already has rendered the parts with required precision,</span> <span class="doccomment">/// so that `self.precision` can be ignored.</span> <span class="kw">fn</span> <span class="ident">pad_formatted_parts</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">formatted</span>: <span class="kw-2">&</span><span class="ident">flt2dec</span>::<span class="ident">Formatted</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">width</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">width</span> { <span class="comment">// for the sign-aware zero padding, we render the sign first and</span> <span class="comment">// behave as if we had no sign from the beginning.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">formatted</span> <span class="op">=</span> <span class="ident">formatted</span>.<span class="ident">clone</span>(); <span class="kw">let</span> <span class="ident">old_fill</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill</span>; <span class="kw">let</span> <span class="ident">old_align</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">align</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">align</span> <span class="op">=</span> <span class="ident">old_align</span>; <span class="kw">if</span> <span class="self">self</span>.<span class="ident">sign_aware_zero_pad</span>() { <span class="comment">// a sign always goes first</span> <span class="kw">let</span> <span class="ident">sign</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="ident">formatted</span>.<span class="ident">sign</span>) }; <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">sign</span>)<span class="question-mark">?</span>; <span class="comment">// remove the sign from the formatted parts</span> <span class="ident">formatted</span>.<span class="ident">sign</span> <span class="op">=</span> <span class="string">b""</span>; <span class="ident">width</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">width</span> <span class="op"><</span> <span class="ident">sign</span>.<span class="ident">len</span>() { <span class="number">0</span> } <span class="kw">else</span> { <span class="ident">width</span> <span class="op">-</span> <span class="ident">sign</span>.<span class="ident">len</span>() }; <span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>; <span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="string">'0'</span>; <span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span>; } <span class="comment">// remaining parts go through the ordinary padding process.</span> <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">formatted</span>.<span class="ident">len</span>(); <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">width</span> <span class="op"><=</span> <span class="ident">len</span> { <span class="comment">// no padding</span> <span class="self">self</span>.<span class="ident">write_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>) } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">with_padding</span>(<span class="ident">width</span> <span class="op">-</span> <span class="ident">len</span>, <span class="ident">align</span>, <span class="op">|</span><span class="ident">f</span><span class="op">|</span> { <span class="ident">f</span>.<span class="ident">write_formatted_parts</span>(<span class="kw-2">&</span><span class="ident">formatted</span>) }) }; <span class="self">self</span>.<span class="ident">fill</span> <span class="op">=</span> <span class="ident">old_fill</span>; <span class="self">self</span>.<span class="ident">align</span> <span class="op">=</span> <span class="ident">old_align</span>; <span class="ident">ret</span> } <span class="kw">else</span> { <span class="comment">// this is the common case and we take a shortcut</span> <span class="self">self</span>.<span class="ident">write_formatted_parts</span>(<span class="ident">formatted</span>) } } <span class="kw">fn</span> <span class="ident">write_formatted_parts</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">formatted</span>: <span class="kw-2">&</span><span class="ident">flt2dec</span>::<span class="ident">Formatted</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">fn</span> <span class="ident">write_bytes</span>(<span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Write</span>, <span class="ident">s</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw">unsafe</span> { <span class="ident">str</span>::<span class="ident">from_utf8_unchecked</span>(<span class="ident">s</span>) }) } <span class="kw">if</span> <span class="op">!</span><span class="ident">formatted</span>.<span class="ident">sign</span>.<span class="ident">is_empty</span>() { <span class="ident">write_bytes</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">formatted</span>.<span class="ident">sign</span>)<span class="question-mark">?</span>; } <span class="kw">for</span> <span class="ident">part</span> <span class="kw">in</span> <span class="ident">formatted</span>.<span class="ident">parts</span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">part</span> { <span class="ident">flt2dec</span>::<span class="ident">Part</span>::<span class="ident">Zero</span>(<span class="kw-2">mut</span> <span class="ident">nzeroes</span>) <span class="op">=></span> { <span class="kw">const</span> <span class="ident">ZEROES</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span> <span class="comment">// 64 zeroes</span> <span class="string">"0000000000000000000000000000000000000000000000000000000000000000"</span>; <span class="kw">while</span> <span class="ident">nzeroes</span> <span class="op">></span> <span class="ident">ZEROES</span>.<span class="ident">len</span>() { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">ZEROES</span>)<span class="question-mark">?</span>; <span class="ident">nzeroes</span> <span class="op">-=</span> <span class="ident">ZEROES</span>.<span class="ident">len</span>(); } <span class="kw">if</span> <span class="ident">nzeroes</span> <span class="op">></span> <span class="number">0</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="ident">ZEROES</span>[..<span class="ident">nzeroes</span>])<span class="question-mark">?</span>; } } <span class="ident">flt2dec</span>::<span class="ident">Part</span>::<span class="ident">Num</span>(<span class="kw-2">mut</span> <span class="ident">v</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">5</span>]; <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">part</span>.<span class="ident">len</span>(); <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">s</span>[..<span class="ident">len</span>].<span class="ident">iter_mut</span>().<span class="ident">rev</span>() { <span class="kw-2">*</span><span class="ident">c</span> <span class="op">=</span> <span class="string">b'0'</span> <span class="op">+</span> (<span class="ident">v</span> <span class="op">%</span> <span class="number">10</span>) <span class="kw">as</span> <span class="ident">u8</span>; <span class="ident">v</span> <span class="op">/=</span> <span class="number">10</span>; } <span class="ident">write_bytes</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="kw-2">&</span><span class="ident">s</span>[..<span class="ident">len</span>])<span class="question-mark">?</span>; } <span class="ident">flt2dec</span>::<span class="ident">Part</span>::<span class="ident">Copy</span>(<span class="ident">buf</span>) <span class="op">=></span> { <span class="ident">write_bytes</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">buf</span>)<span class="question-mark">?</span>; } } } <span class="prelude-val">Ok</span>(()) } <span class="doccomment">/// Writes some data to the underlying buffer contained within this</span> <span class="doccomment">/// formatter.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">data</span>) } <span class="doccomment">/// Writes some formatted information into this instance</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">fmt</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">write</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">fmt</span>) } <span class="doccomment">/// Flags for formatting</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="attribute">#[<span class="ident">rustc_deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"use the `sign_plus`, `sign_minus`, `alternate`, \ or `sign_aware_zero_pad` methods instead"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flags</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u32</span> { <span class="self">self</span>.<span class="ident">flags</span> } <span class="doccomment">/// Character used as 'fill' whenever there is alignment</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fill</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">char</span> { <span class="self">self</span>.<span class="ident">fill</span> } <span class="doccomment">/// Flag indicating what form of alignment was requested</span> <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags_align"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"method was just created"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27726"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">align</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Alignment</span> { <span class="kw">match</span> <span class="self">self</span>.<span class="ident">align</span> { <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Left</span> <span class="op">=></span> <span class="ident">Alignment</span>::<span class="ident">Left</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Right</span> <span class="op">=></span> <span class="ident">Alignment</span>::<span class="ident">Right</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Center</span> <span class="op">=></span> <span class="ident">Alignment</span>::<span class="ident">Center</span>, <span class="ident">rt</span>::<span class="ident">v1</span>::<span class="ident">Alignment</span>::<span class="ident">Unknown</span> <span class="op">=></span> <span class="ident">Alignment</span>::<span class="ident">Unknown</span>, } } <span class="doccomment">/// Optionally specified integer width that the output should be</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">width</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">width</span> } <span class="doccomment">/// Optionally specified precision for numeric types</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">precision</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">precision</span> } <span class="doccomment">/// Determines if the `+` flag was specified.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sign_plus</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">SignPlus</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> } <span class="doccomment">/// Determines if the `-` flag was specified.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sign_minus</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">SignMinus</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> } <span class="doccomment">/// Determines if the `#` flag was specified.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">alternate</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">Alternate</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> } <span class="doccomment">/// Determines if the `0` flag was specified.</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fmt_flags"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sign_aware_zero_pad</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">flags</span> <span class="op">&</span> (<span class="number">1</span> <span class="op"><<</span> <span class="ident">FlagV1</span>::<span class="ident">SignAwareZeroPad</span> <span class="kw">as</span> <span class="ident">u32</span>) <span class="op">!=</span> <span class="number">0</span> } <span class="doccomment">/// Creates a [`DebugStruct`] builder designed to assist with creation of</span> <span class="doccomment">/// [`fmt::Debug`] implementations for structs.</span> <span class="doccomment">///</span> <span class="doccomment">/// [`DebugStruct`]: ../../std/fmt/struct.DebugStruct.html</span> <span class="doccomment">/// [`fmt::Debug`]: ../../std/fmt/trait.Debug.html</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Foo {</span> <span class="doccomment">/// bar: i32,</span> <span class="doccomment">/// baz: String,</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Foo {</span> <span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// fmt.debug_struct("Foo")</span> <span class="doccomment">/// .field("bar", &self.bar)</span> <span class="doccomment">/// .field("baz", &self.baz)</span> <span class="doccomment">/// .finish()</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // prints "Foo { bar: 10, baz: "Hello World" }"</span> <span class="doccomment">/// println!("{:?}", Foo { bar: 10, baz: "Hello World".to_string() });</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_struct</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">DebugStruct</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">builders</span>::<span class="ident">debug_struct_new</span>(<span class="self">self</span>, <span class="ident">name</span>) } <span class="doccomment">/// Creates a `DebugTuple` builder designed to assist with creation of</span> <span class="doccomment">/// `fmt::Debug` implementations for tuple structs.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Foo(i32, String);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Foo {</span> <span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// fmt.debug_tuple("Foo")</span> <span class="doccomment">/// .field(&self.0)</span> <span class="doccomment">/// .field(&self.1)</span> <span class="doccomment">/// .finish()</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // prints "Foo(10, "Hello World")"</span> <span class="doccomment">/// println!("{:?}", Foo(10, "Hello World".to_string()));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_tuple</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">DebugTuple</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">builders</span>::<span class="ident">debug_tuple_new</span>(<span class="self">self</span>, <span class="ident">name</span>) } <span class="doccomment">/// Creates a `DebugList` builder designed to assist with creation of</span> <span class="doccomment">/// `fmt::Debug` implementations for list-like structures.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Foo(Vec<i32>);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Foo {</span> <span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// fmt.debug_list().entries(self.0.iter()).finish()</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // prints "[10, 11]"</span> <span class="doccomment">/// println!("{:?}", Foo(vec![10, 11]));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_list</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">DebugList</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">builders</span>::<span class="ident">debug_list_new</span>(<span class="self">self</span>) } <span class="doccomment">/// Creates a `DebugSet` builder designed to assist with creation of</span> <span class="doccomment">/// `fmt::Debug` implementations for set-like structures.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Foo(Vec<i32>);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Foo {</span> <span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// fmt.debug_set().entries(self.0.iter()).finish()</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // prints "{10, 11}"</span> <span class="doccomment">/// println!("{:?}", Foo(vec![10, 11]));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_set</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">DebugSet</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">builders</span>::<span class="ident">debug_set_new</span>(<span class="self">self</span>) } <span class="doccomment">/// Creates a `DebugMap` builder designed to assist with creation of</span> <span class="doccomment">/// `fmt::Debug` implementations for map-like structures.</span> <span class="doccomment">///</span> <span class="doccomment">/// # Examples</span> <span class="doccomment">///</span> <span class="doccomment">/// ```rust</span> <span class="doccomment">/// use std::fmt;</span> <span class="doccomment">///</span> <span class="doccomment">/// struct Foo(Vec<(String, i32)>);</span> <span class="doccomment">///</span> <span class="doccomment">/// impl fmt::Debug for Foo {</span> <span class="doccomment">/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {</span> <span class="doccomment">/// fmt.debug_map().entries(self.0.iter().map(|&(ref k, ref v)| (k, v))).finish()</span> <span class="doccomment">/// }</span> <span class="doccomment">/// }</span> <span class="doccomment">///</span> <span class="doccomment">/// // prints "{"A": 10, "B": 11}"</span> <span class="doccomment">/// println!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)]));</span> <span class="doccomment">/// ```</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"debug_builders"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_map</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">DebugMap</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="lifetime">'a</span><span class="op">></span> { <span class="ident">builders</span>::<span class="ident">debug_map_new</span>(<span class="self">self</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"formatter_write"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_str</span>(<span class="ident">s</span>) } <span class="kw">fn</span> <span class="ident">write_char</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_char</span>(<span class="ident">c</span>) } <span class="kw">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">write</span>(<span class="self">self</span>.<span class="ident">buf</span>, <span class="ident">args</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Error</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="string">"an error occurred when formatting an argument"</span>, <span class="ident">f</span>) } } <span class="comment">// Implementations of the core formatting traits</span> <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">fmt_refs</span> { ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span>:<span class="ident">ident</span>),<span class="kw-2">*</span>) <span class="op">=></span> { $( <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span><span class="op">></span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tr</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</span>) } } )<span class="op">*</span> } } <span class="macro">fmt_refs</span><span class="macro">!</span> { <span class="ident">Debug</span>, <span class="ident">Display</span>, <span class="ident">Octal</span>, <span class="ident">Binary</span>, <span class="ident">LowerHex</span>, <span class="ident">UpperHex</span>, <span class="ident">LowerExp</span>, <span class="ident">UpperExp</span> } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"never_type"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35121"</span>)]</span> <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="op">!</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, _: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw-2">*</span><span class="self">self</span> } } <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"never_type"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35121"</span>)]</span> <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="op">!</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, _: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw-2">*</span><span class="self">self</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">bool</span> { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">bool</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="kw">if</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="string">"true"</span> } <span class="kw">else</span> { <span class="string">"false"</span> }, <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">str</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'"'</span>)<span class="question-mark">?</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">from</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">c</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">char_indices</span>() { <span class="kw">let</span> <span class="ident">esc</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">escape_debug</span>(); <span class="comment">// If char needs escaping, flush backlog so far and write, else skip</span> <span class="kw">if</span> <span class="ident">esc</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="number">1</span> { <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">from</span>..<span class="ident">i</span>])<span class="question-mark">?</span>; <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">esc</span> { <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>; } <span class="ident">from</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="ident">c</span>.<span class="ident">len_utf8</span>(); } } <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw-2">&</span><span class="self">self</span>[<span class="ident">from</span>..])<span class="question-mark">?</span>; <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'"'</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">str</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">pad</span>(<span class="self">self</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">char</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'\''</span>)<span class="question-mark">?</span>; <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">escape_debug</span>() { <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span> } <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="string">'\''</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">char</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">if</span> <span class="ident">f</span>.<span class="ident">width</span>.<span class="ident">is_none</span>() <span class="op">&&</span> <span class="ident">f</span>.<span class="ident">precision</span>.<span class="ident">is_none</span>() { <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="kw-2">*</span><span class="self">self</span>) } <span class="kw">else</span> { <span class="ident">f</span>.<span class="ident">pad</span>(<span class="self">self</span>.<span class="ident">encode_utf8</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="number">0</span>; <span class="number">4</span>])) } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">let</span> <span class="ident">old_width</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">width</span>; <span class="kw">let</span> <span class="ident">old_flags</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">flags</span>; <span class="comment">// The alternate flag is already treated by LowerHex as being special-</span> <span class="comment">// it denotes whether to prefix with 0x. We use it to work out whether</span> <span class="comment">// or not to zero extend, and then unconditionally set it to get the</span> <span class="comment">// prefix.</span> <span class="kw">if</span> <span class="ident">f</span>.<span class="ident">alternate</span>() { <span class="ident">f</span>.<span class="ident">flags</span> <span class="op">|=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="ident">FlagV1</span>::<span class="ident">SignAwareZeroPad</span> <span class="kw">as</span> <span class="ident">u32</span>); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">None</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">width</span> { <span class="ident">f</span>.<span class="ident">width</span> <span class="op">=</span> <span class="prelude-val">Some</span>(((<span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>() <span class="op">*</span> <span class="number">8</span>) <span class="op">/</span> <span class="number">4</span>) <span class="op">+</span> <span class="number">2</span>); } } <span class="ident">f</span>.<span class="ident">flags</span> <span class="op">|=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="ident">FlagV1</span>::<span class="ident">Alternate</span> <span class="kw">as</span> <span class="ident">u32</span>); <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">LowerHex</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> () <span class="kw">as</span> <span class="ident">usize</span>), <span class="ident">f</span>); <span class="ident">f</span>.<span class="ident">width</span> <span class="op">=</span> <span class="ident">old_width</span>; <span class="ident">f</span>.<span class="ident">flags</span> <span class="op">=</span> <span class="ident">old_flags</span>; <span class="ident">ret</span> } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>), <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>), <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Pointer</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>), <span class="ident">f</span>) } } <span class="comment">// Implementation of Display/Debug for various core types</span> <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Pointer</span>::<span class="ident">fmt</span>(<span class="self">self</span>, <span class="ident">f</span>) } } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">peel</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">other</span>:<span class="ident">ident</span>,)<span class="kw-2">*</span>) <span class="op">=></span> (<span class="macro">tuple</span><span class="macro">!</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">other</span>,)<span class="op">*</span> }) } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">tuple</span> { () <span class="op">=></span> (); ( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">ident</span>,)<span class="op">+</span> ) <span class="op">=></span> ( <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span>$(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>:<span class="ident">Debug</span>),<span class="kw-2">*</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="kw-2">*</span>) <span class="kw">where</span> <span class="macro">last_type</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="op">+</span>): <span class="question-mark">?</span><span class="ident">Sized</span> { <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_snake_case</span>, <span class="ident">unused_assignments</span>, <span class="ident">deprecated</span>)]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">builder</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">""</span>); <span class="kw">let</span> ($(<span class="kw-2">ref</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="kw-2">*</span>) <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span>; $( <span class="ident">builder</span>.<span class="ident">field</span>(<span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>); )<span class="op">*</span> <span class="ident">builder</span>.<span class="ident">finish</span>() } } <span class="macro">peel</span><span class="macro">!</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">name</span>,)<span class="op">*</span> } ) } <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">last_type</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span>,) <span class="op">=></span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span> }; (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">a</span>:<span class="ident">ident</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest_a</span>:<span class="ident">ident</span>,)<span class="op">+</span>) <span class="op">=></span> { <span class="macro">last_type</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest_a</span>,)<span class="op">+</span>) }; } <span class="macro">tuple</span><span class="macro">!</span> { <span class="ident">T0</span>, <span class="ident">T1</span>, <span class="ident">T2</span>, <span class="ident">T3</span>, <span class="ident">T4</span>, <span class="ident">T5</span>, <span class="ident">T6</span>, <span class="ident">T7</span>, <span class="ident">T8</span>, <span class="ident">T9</span>, <span class="ident">T10</span>, <span class="ident">T11</span>, } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> [<span class="ident">T</span>] { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">iter</span>()).<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> () { <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"()"</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"PhantomData"</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Copy</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Cell"</span>) .<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">get</span>()) .<span class="ident">finish</span>() } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="kw">match</span> <span class="self">self</span>.<span class="ident">try_borrow</span>() { <span class="prelude-val">Ok</span>(<span class="ident">borrow</span>) <span class="op">=></span> { <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RefCell"</span>) .<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="ident">borrow</span>) .<span class="ident">finish</span>() } <span class="prelude-val">Err</span>(_) <span class="op">=></span> { <span class="comment">// The RefCell is mutably borrowed so we can't look at its value</span> <span class="comment">// here. Show a placeholder instead.</span> <span class="kw">struct</span> <span class="ident">BorrowedPlaceholder</span>; <span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BorrowedPlaceholder</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">"<borrowed>"</span>) } } <span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"RefCell"</span>) .<span class="ident">field</span>(<span class="string">"value"</span>, <span class="kw-2">&</span><span class="ident">BorrowedPlaceholder</span>) .<span class="ident">finish</span>() } } } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span>(<span class="self">self</span>.<span class="ident">deref</span>()), <span class="ident">f</span>) } } <span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_impl_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Debug</span><span class="op">></span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-></span> <span class="prelude-ty">Result</span> { <span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"UnsafeCell"</span>) } } <span class="comment">// If you expected tests to be here, look instead at the run-pass/ifmt.rs test,</span> <span class="comment">// it's a lot easier than creating all of the rt::Piece structures here.</span> </pre> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> 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