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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ViewPatterns, PatternGuards #-}</span>
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<a name="line-3"></a><span class='hs-comment'>{-
<a name="line-4"></a> Improve the structure of code
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<a name="line-6"></a><TEST>
<a name="line-7"></a>yes x y = if a then b else if c then d else e -- yes x y ; | a = b ; | c = d ; | otherwise = e
<a name="line-8"></a>x `yes` y = if a then b else if c then d else e -- yes x y ; | a = b ; | c = d ; | otherwise = e
<a name="line-9"></a>no x y = if a then b else c
<a name="line-10"></a>foo b | c <- f b = c -- foo (f -> c) = c
<a name="line-11"></a>foo x y b z | c:cs <- f g b = c -- foo x y (f g -> c:cs) z = c
<a name="line-12"></a>foo b | c <- f b = c + b
<a name="line-13"></a>foo b | c <- f b = c where f = here
<a name="line-14"></a>foo b | c <- f b = c where foo = b
<a name="line-15"></a>foo b | c <- f b = c \
<a name="line-16"></a> | c <- f b = c
<a name="line-17"></a>foo x = yes x x where yes x y = if a then b else if c then d else e -- yes x y ; | a = b ; | c = d ; | otherwise = e
<a name="line-18"></a>foo x | otherwise = y -- foo x = y
<a name="line-19"></a>-- FIXME: #358 foo x = x + x where -- foo x = x + x
<a name="line-20"></a>foo x | a = b | True = d -- foo x | a = b ; | otherwise = d
<a name="line-21"></a></TEST>
<a name="line-22"></a>-}</span>
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<a name="line-25"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Hint</span><span class='hs-varop'>.</span><span class='hs-conid'>Structure</span> <span class='hs-keyword'>where</span>
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<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Hint</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Util</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
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<a name="line-32"></a><a name="structureHint"></a><span class='hs-definition'>structureHint</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DeclHint</span>
<a name="line-33"></a><span class='hs-definition'>structureHint</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-varid'>hints</span> <span class='hs-varop'>.</span> <span class='hs-varid'>swap</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>asPattern</span> <span class='hs-varid'>x</span>
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<a name="line-36"></a><a name="hints"></a><span class='hs-definition'>hints</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Idea</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Idea</span><span class='hs-keyglyph'>]</span>
<a name="line-37"></a><span class='hs-definition'>hints</span> <span class='hs-varid'>gen</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pat</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnGuardedRhs</span> <span class='hs-varid'>d</span> <span class='hs-varid'>bod</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-38"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>length</span> <span class='hs-varid'>guards</span> <span class='hs-varop'>></span> <span class='hs-num'>2</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>gen</span> <span class='hs-str'>"Use guards"</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Pattern</span> <span class='hs-varid'>pat</span> <span class='hs-layout'>(</span><span class='hs-conid'>GuardedRhss</span> <span class='hs-varid'>d</span> <span class='hs-varid'>guards</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-keyglyph'>]</span>
<a name="line-39"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>guards</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>asGuards</span> <span class='hs-varid'>bod</span>
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<a name="line-41"></a><span class='hs-definition'>hints</span> <span class='hs-varid'>gen</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-layout'>(</span><span class='hs-conid'>GuardedRhss</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>GuardedRhs</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Generator</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>pat</span> <span class='hs-layout'>(</span><span class='hs-conid'>App</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>op</span> <span class='hs-layout'>(</span><span class='hs-varid'>view</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Var_</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>bod</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-42"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>findIndex</span> <span class='hs-layout'>(</span><span class='hs-varop'>=~=</span> <span class='hs-layout'>(</span><span class='hs-varid'>toNamed</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Pat_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>pats</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`notElem`</span> <span class='hs-layout'>(</span><span class='hs-varid'>vars</span> <span class='hs-varid'>bod</span> <span class='hs-varop'>++</span> <span class='hs-varid'>vars</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>vars</span> <span class='hs-varid'>op</span> <span class='hs-varop'>`disjoint`</span> <span class='hs-varid'>decsBind</span><span class='hs-layout'>,</span> <span class='hs-varid'>pvars</span> <span class='hs-varid'>pats</span> <span class='hs-varop'>`disjoint`</span> <span class='hs-varid'>vars</span> <span class='hs-varid'>op</span><span class='hs-layout'>,</span> <span class='hs-varid'>pvars</span> <span class='hs-varid'>pat</span> <span class='hs-varop'>`disjoint`</span> <span class='hs-varid'>pvars</span> <span class='hs-varid'>pats</span>
<a name="line-45"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>gen</span> <span class='hs-str'>"Use view patterns"</span> <span class='hs-varop'>$</span>
<a name="line-46"></a> <span class='hs-conid'>Pattern</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-varid'>i</span> <span class='hs-varid'>pats</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PParen</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PViewPat</span> <span class='hs-varid'>an</span> <span class='hs-varid'>op</span> <span class='hs-varid'>pat</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>pats</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnGuardedRhs</span> <span class='hs-varid'>an</span> <span class='hs-varid'>bod</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-keyglyph'>]</span>
<a name="line-47"></a> <span class='hs-keyword'>where</span>
<a name="line-48"></a> <span class='hs-varid'>decsBind</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>nub</span> <span class='hs-varop'>$</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>declBind</span> <span class='hs-varop'>$</span> <span class='hs-varid'>childrenBi</span> <span class='hs-varid'>bind</span>
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<a name="line-50"></a><span class='hs-definition'>hints</span> <span class='hs-varid'>gen</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-layout'>(</span><span class='hs-conid'>GuardedRhss</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>GuardedRhs</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>test</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>bod</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>prettyPrint</span> <span class='hs-varid'>test</span> <span class='hs-varop'>`elem`</span> <span class='hs-keyglyph'>[</span><span class='hs-str'>"otherwise"</span><span class='hs-layout'>,</span><span class='hs-str'>"True"</span><span class='hs-keyglyph'>]</span>
<a name="line-52"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>gen</span> <span class='hs-str'>"Redundant guard"</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnGuardedRhs</span> <span class='hs-varid'>an</span> <span class='hs-varid'>bod</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-keyglyph'>]</span>
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<a name="line-54"></a><span class='hs-definition'>hints</span> <span class='hs-varid'>gen</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-varid'>bod</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bind</span> <span class='hs-varop'>&&</span> <span class='hs-conid'>False</span> <span class='hs-comment'>-- disabled due to bug 358</span>
<a name="line-55"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>gen</span> <span class='hs-str'>"Redundant where"</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-varid'>bod</span> <span class='hs-conid'>Nothing</span><span class='hs-keyglyph'>]</span>
<a name="line-56"></a> <span class='hs-keyword'>where</span>
<a name="line-57"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>BDecls</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>null</span> <span class='hs-varid'>x</span>
<a name="line-58"></a> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>IPBinds</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>null</span> <span class='hs-varid'>x</span>
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<a name="line-60"></a><span class='hs-definition'>hints</span> <span class='hs-varid'>gen</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-layout'>(</span><span class='hs-conid'>GuardedRhss</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsnoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>gs</span><span class='hs-layout'>,</span> <span class='hs-conid'>GuardedRhs</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>test</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>bod</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-61"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>prettyPrint</span> <span class='hs-varid'>test</span> <span class='hs-varop'>==</span> <span class='hs-str'>"True"</span>
<a name="line-62"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>gen</span> <span class='hs-str'>"Use otherwise"</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Pattern</span> <span class='hs-varid'>pats</span> <span class='hs-layout'>(</span><span class='hs-conid'>GuardedRhss</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-varid'>gs</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>GuardedRhs</span> <span class='hs-varid'>an</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Qualifier</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toNamed</span> <span class='hs-str'>"otherwise"</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>bod</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-keyglyph'>]</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='hs-definition'>hints</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-65"></a>
<a name="line-66"></a>
<a name="line-67"></a><a name="asGuards"></a><span class='hs-definition'>asGuards</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exp_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>GuardedRhs</span> <span class='hs-conid'>S</span><span class='hs-keyglyph'>]</span>
<a name="line-68"></a><span class='hs-definition'>asGuards</span> <span class='hs-layout'>(</span><span class='hs-conid'>Paren</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>asGuards</span> <span class='hs-varid'>x</span>
<a name="line-69"></a><span class='hs-definition'>asGuards</span> <span class='hs-layout'>(</span><span class='hs-conid'>If</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GuardedRhs</span> <span class='hs-varid'>an</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Qualifier</span> <span class='hs-varid'>an</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>b</span> <span class='hs-conop'>:</span> <span class='hs-varid'>asGuards</span> <span class='hs-varid'>c</span>
<a name="line-70"></a><span class='hs-definition'>asGuards</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>GuardedRhs</span> <span class='hs-varid'>an</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Qualifier</span> <span class='hs-varid'>an</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toNamed</span> <span class='hs-str'>"otherwise"</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-71"></a>
<a name="line-72"></a>
<a name="line-73"></a><a name="Pattern"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Pat_</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rhs</span> <span class='hs-conid'>S</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Binds</span> <span class='hs-conid'>S</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="asPattern"></a><span class='hs-comment'>-- Invariant: Number of patterns may not change</span>
<a name="line-76"></a><span class='hs-definition'>asPattern</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Decl_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Idea</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-77"></a><span class='hs-definition'>asPattern</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>decl</span> <span class='hs-layout'>(</span><span class='hs-varid'>universeBi</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>alt</span> <span class='hs-layout'>(</span><span class='hs-varid'>universeBi</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-78"></a> <span class='hs-keyword'>where</span>
<a name="line-79"></a> <span class='hs-varid'>decl</span> <span class='hs-varid'>o</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>PatBind</span> <span class='hs-varid'>a</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pat</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>msg</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pat</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>warn</span> <span class='hs-varid'>msg</span> <span class='hs-varid'>o</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PatBind</span> <span class='hs-varid'>a</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-80"></a> <span class='hs-varid'>decl</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunBind</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>match</span> <span class='hs-varid'>xs</span>
<a name="line-81"></a> <span class='hs-varid'>decl</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-82"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>o</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Match</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>msg</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>warn</span> <span class='hs-varid'>msg</span> <span class='hs-varid'>o</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Match</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-83"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>o</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>InfixMatch</span> <span class='hs-varid'>a</span> <span class='hs-varid'>p</span> <span class='hs-varid'>b</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:</span><span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>msg</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-conop'>:</span><span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>warn</span> <span class='hs-varid'>msg</span> <span class='hs-varid'>o</span> <span class='hs-varop'>$</span> <span class='hs-conid'>InfixMatch</span> <span class='hs-varid'>a</span> <span class='hs-varid'>p</span> <span class='hs-varid'>b</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-varid'>alt</span> <span class='hs-varid'>o</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Alt</span> <span class='hs-varid'>a</span> <span class='hs-varid'>pat</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pat</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromGuardedAlts</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>msg</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>pat</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>warn</span> <span class='hs-varid'>msg</span> <span class='hs-varid'>o</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Alt</span> <span class='hs-varid'>a</span> <span class='hs-varid'>pat</span> <span class='hs-layout'>(</span><span class='hs-varid'>toGuardedAlts</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span> <span class='hs-varid'>bind</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
</pre></body>
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