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<title>src/full/Agda/TypeChecking/DisplayForm.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>DisplayForm</span> <span class='hs-keyword'>where</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Traversable</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>mapM</span><span class='hs-layout'>)</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>Substitute</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>Reduce</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>TypeChecking</span><span class='hs-varop'>.</span><span class='hs-conid'>Level</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span><span class='hs-varop'>.</span><span class='hs-conid'>Scope</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span><span class='hs-varop'>.</span><span class='hs-conid'>Size</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-cpp'>#include "../undefined.h"</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Agda</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span><span class='hs-varop'>.</span><span class='hs-conid'>Impossible</span>
<a name="line-21"></a>
<a name="line-22"></a><a name="displayForm"></a><span class='hs-definition'>displayForm</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>QName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Args</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TCM</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>DisplayTerm</span><span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-definition'>displayForm</span> <span class='hs-varid'>c</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-24"></a> <span class='hs-varid'>odfs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>defDisplay</span> <span class='hs-varop'><$></span> <span class='hs-varid'>getConstInfo</span> <span class='hs-varid'>c</span>
<a name="line-25"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>null</span> <span class='hs-varid'>odfs</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>verboseS</span> <span class='hs-str'>"tc.display.top"</span> <span class='hs-num'>100</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-26"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getContextId</span>
<a name="line-27"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>fvs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-conid'>OpenThing</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>odfs</span>
<a name="line-28"></a> <span class='hs-varid'>reportSLn</span> <span class='hs-str'>""</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-str'>"displayForm: context = "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>n</span> <span class='hs-varop'>++</span> <span class='hs-str'>", dfs = "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>fvs</span>
<a name="line-29"></a> <span class='hs-varid'>dfs</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span>
<a name="line-30"></a> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>tryOpen</span> <span class='hs-varid'>odfs</span>
<a name="line-31"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>df</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>df</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>]</span>
<a name="line-32"></a> <span class='hs-varid'>scope</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getScope</span>
<a name="line-33"></a> <span class='hs-varid'>ms</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span>
<a name="line-34"></a> <span class='hs-varid'>ms</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-varid'>matchDisplayForm</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-varid'>dfs</span>
<a name="line-35"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ms</span><span class='hs-layout'>,</span> <span class='hs-varid'>inScope</span> <span class='hs-varid'>scope</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>]</span>
<a name="line-36"></a> <span class='hs-comment'>-- Not safe when printing non-terminating terms.</span>
<a name="line-37"></a> <span class='hs-comment'>-- (nfdfs, us) <- normalise (dfs, vs)</span>
<a name="line-38"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>null</span> <span class='hs-varid'>odfs</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reportSLn</span> <span class='hs-str'>"tc.display.top"</span> <span class='hs-num'>100</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unlines</span>
<a name="line-39"></a> <span class='hs-keyglyph'>[</span> <span class='hs-str'>"name : "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>c</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-str'>"displayForms: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>dfs</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-str'>"arguments : "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>vs</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-str'>"matches : "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>ms</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-str'>"result : "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span>
<a name="line-44"></a> <span class='hs-keyglyph'>]</span>
<a name="line-45"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>ms</span>
<a name="line-46"></a> <span class='hs-varop'>`catchError`</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-47"></a> <span class='hs-keyword'>where</span>
<a name="line-48"></a> <span class='hs-varid'>inScope</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <span class='hs-comment'>-- TODO: distinguish between with display forms and other display forms</span>
<a name="line-49"></a><span class='hs-comment'>-- inScope scope d = case hd d of</span>
<a name="line-50"></a><span class='hs-comment'>-- Just h -> maybe False (const True) $ inverseScopeLookupName h scope</span>
<a name="line-51"></a><span class='hs-comment'>-- Nothing -> __IMPOSSIBLE__ -- TODO: currently all display forms have heads</span>
<a name="line-52"></a> <span class='hs-varid'>hd</span> <span class='hs-layout'>(</span><span class='hs-conid'>DTerm</span> <span class='hs-layout'>(</span><span class='hs-conid'>Def</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-53"></a> <span class='hs-varid'>hd</span> <span class='hs-layout'>(</span><span class='hs-conid'>DTerm</span> <span class='hs-layout'>(</span><span class='hs-conid'>Con</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-54"></a> <span class='hs-varid'>hd</span> <span class='hs-layout'>(</span><span class='hs-conid'>DTerm</span> <span class='hs-layout'>(</span><span class='hs-conid'>Shared</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'>hd</span> <span class='hs-layout'>(</span><span class='hs-conid'>DTerm</span> <span class='hs-varop'>$</span> <span class='hs-varid'>derefPtr</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-varid'>hd</span> <span class='hs-layout'>(</span><span class='hs-conid'>DWithApp</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>hd</span> <span class='hs-varid'>d</span>
<a name="line-56"></a> <span class='hs-varid'>hd</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="matchDisplayForm"></a><span class='hs-definition'>matchDisplayForm</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DisplayForm</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Args</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TCM</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>DisplayTerm</span><span class='hs-layout'>)</span>
<a name="line-59"></a><span class='hs-definition'>matchDisplayForm</span> <span class='hs-layout'>(</span><span class='hs-conid'>Display</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ps</span> <span class='hs-varop'>></span> <span class='hs-varid'>length</span> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-61"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-62"></a> <span class='hs-varid'>mus</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ps</span> <span class='hs-varop'>$</span> <span class='hs-varid'>raise</span> <span class='hs-num'>1</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>unArg</span> <span class='hs-varid'>vs0</span><span class='hs-layout'>)</span>
<a name="line-63"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>us</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>applySubst</span> <span class='hs-layout'>(</span><span class='hs-varid'>parallelS</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>us</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span> <span class='hs-varop'>`apply`</span> <span class='hs-varid'>vs1</span><span class='hs-layout'>)</span> <span class='hs-varid'>mus</span>
<a name="line-64"></a> <span class='hs-keyword'>where</span>
<a name="line-65"></a> <span class='hs-layout'>(</span><span class='hs-varid'>vs0</span><span class='hs-layout'>,</span> <span class='hs-varid'>vs1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitAt</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="Match"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Match</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-68"></a> <span class='hs-varid'>match</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Nat</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TCM</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Term</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-69"></a>
<a name="line-70"></a><a name="instance%20Match%20%5ba%5d"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Match</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Match</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
<a name="line-71"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>traverse</span> <span class='hs-varid'>id</span> <span class='hs-varop'><$></span> <span class='hs-varid'>zipWithM</span> <span class='hs-layout'>(</span><span class='hs-varid'>match</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-72"></a>
<a name="line-73"></a><a name="instance%20Match%20(Arg%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Match</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Match</span> <span class='hs-layout'>(</span><span class='hs-conid'>Arg</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-74"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>unArg</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unArg</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-75"></a>
<a name="line-76"></a><a name="instance%20Match%20Term"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Match</span> <span class='hs-conid'>Term</span> <span class='hs-keyword'>where</span>
<a name="line-77"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>ignoreSharing</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>ignoreSharing</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-78"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Var</span> <span class='hs-num'>0</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>subst</span> <span class='hs-sel'>__IMPOSSIBLE__</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span>
<a name="line-79"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Var</span> <span class='hs-varid'>i</span> <span class='hs-varid'>ps</span><span class='hs-layout'>,</span> <span class='hs-conid'>Var</span> <span class='hs-varid'>j</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>vs</span>
<a name="line-80"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Def</span> <span class='hs-varid'>c</span> <span class='hs-varid'>ps</span><span class='hs-layout'>,</span> <span class='hs-conid'>Def</span> <span class='hs-varid'>d</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>vs</span>
<a name="line-81"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Con</span> <span class='hs-varid'>c</span> <span class='hs-varid'>ps</span><span class='hs-layout'>,</span> <span class='hs-conid'>Con</span> <span class='hs-varid'>d</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>vs</span>
<a name="line-82"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Lit</span> <span class='hs-varid'>l</span><span class='hs-layout'>,</span> <span class='hs-conid'>Lit</span> <span class='hs-varid'>l'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'>==</span> <span class='hs-varid'>l'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>[]</span>
<a name="line-83"></a> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varop'>==</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>[]</span>
<a name="line-84"></a> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Level</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>reallyUnLevelView</span> <span class='hs-varid'>l</span>
<a name="line-85"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Sort</span> <span class='hs-varid'>ps</span><span class='hs-layout'>,</span> <span class='hs-conid'>Sort</span> <span class='hs-varid'>pv</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>pv</span>
<a name="line-86"></a> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-conid'>Sort</span> <span class='hs-layout'>(</span><span class='hs-conid'>Type</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>reallyUnLevelView</span> <span class='hs-varid'>v</span>
<a name="line-87"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-88"></a>
<a name="line-89"></a><a name="instance%20Match%20Sort"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Match</span> <span class='hs-conid'>Sort</span> <span class='hs-keyword'>where</span>
<a name="line-90"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-91"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Type</span> <span class='hs-varid'>pl</span><span class='hs-layout'>,</span> <span class='hs-conid'>Type</span> <span class='hs-varid'>vl</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>pl</span> <span class='hs-varid'>vl</span>
<a name="line-92"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varop'>==</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>[]</span>
<a name="line-93"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="instance%20Match%20Level"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Match</span> <span class='hs-conid'>Level</span> <span class='hs-keyword'>where</span>
<a name="line-96"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-97"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reallyUnLevelView</span> <span class='hs-varid'>p</span>
<a name="line-98"></a> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reallyUnLevelView</span> <span class='hs-varid'>v</span>
<a name="line-99"></a> <span class='hs-varid'>match</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-varid'>v</span>
</pre></body>
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