<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Language/Haskell/ParseUtils.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-comment'>-- #hide</span> <a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-3"></a><span class='hs-comment'>-- |</span> <a name="line-4"></a><span class='hs-comment'>-- Module : Language.Haskell.ParseUtils</span> <a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) The GHC Team, 1997-2000</span> <a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/base/LICENSE)</span> <a name="line-7"></a><span class='hs-comment'>-- </span> <a name="line-8"></a><span class='hs-comment'>-- Maintainer : libraries@haskell.org</span> <a name="line-9"></a><span class='hs-comment'>-- Stability : experimental</span> <a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span> <a name="line-11"></a><span class='hs-comment'>--</span> <a name="line-12"></a><span class='hs-comment'>-- Utilities for the Haskell parser.</span> <a name="line-13"></a><span class='hs-comment'>--</span> <a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-15"></a> <a name="line-16"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>ParseUtils</span> <span class='hs-layout'>(</span> <a name="line-17"></a> <span class='hs-varid'>splitTyConApp</span> <span class='hs-comment'>-- HsType -> P (HsName,[HsType])</span> <a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mkRecConstrOrUpdate</span> <span class='hs-comment'>-- HsExp -> [HsFieldUpdate] -> P HsExp</span> <a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkPrec</span> <span class='hs-comment'>-- Integer -> P Int</span> <a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkContext</span> <span class='hs-comment'>-- HsType -> P HsContext</span> <a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkAssertion</span> <span class='hs-comment'>-- HsType -> P HsAsst</span> <a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkDataHeader</span> <span class='hs-comment'>-- HsQualType -> P (HsContext,HsName,[HsName])</span> <a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkClassHeader</span> <span class='hs-comment'>-- HsQualType -> P (HsContext,HsName,[HsName])</span> <a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkInstHeader</span> <span class='hs-comment'>-- HsQualType -> P (HsContext,HsQName,[HsType])</span> <a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkPattern</span> <span class='hs-comment'>-- HsExp -> P HsPat</span> <a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkExpr</span> <span class='hs-comment'>-- HsExp -> P HsExp</span> <a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkValDef</span> <span class='hs-comment'>-- SrcLoc -> HsExp -> HsRhs -> [HsDecl] -> P HsDecl</span> <a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkClassBody</span> <span class='hs-comment'>-- [HsDecl] -> P [HsDecl]</span> <a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkUnQual</span> <span class='hs-comment'>-- HsQName -> P HsName</span> <a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>checkRevDecls</span> <span class='hs-comment'>-- [HsDecl] -> P [HsDecl]</span> <a name="line-31"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-32"></a> <a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Syntax</span> <a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>ParseMonad</span> <a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Pretty</span> <a name="line-36"></a> <a name="line-37"></a><a name="splitTyConApp"></a><span class='hs-definition'>splitTyConApp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsType</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-38"></a><span class='hs-definition'>splitTyConApp</span> <span class='hs-varid'>t0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>split</span> <span class='hs-varid'>t0</span> <span class='hs-conid'>[]</span> <a name="line-39"></a> <span class='hs-keyword'>where</span> <a name="line-40"></a> <span class='hs-varid'>split</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsType</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsType</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-41"></a> <span class='hs-varid'>split</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyApp</span> <span class='hs-varid'>t</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>split</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-42"></a> <span class='hs-varid'>split</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyCon</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnQual</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-43"></a> <span class='hs-varid'>split</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal data/newtype declaration"</span> <a name="line-44"></a> <a name="line-45"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-46"></a><span class='hs-comment'>-- Various Syntactic Checks</span> <a name="line-47"></a> <a name="line-48"></a><a name="checkContext"></a><span class='hs-definition'>checkContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsContext</span> <a name="line-49"></a><span class='hs-definition'>checkContext</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyTuple</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-50"></a> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkAssertion</span> <span class='hs-varid'>ts</span> <a name="line-51"></a><span class='hs-definition'>checkContext</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-52"></a> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkAssertion</span> <span class='hs-varid'>t</span> <a name="line-53"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span> <a name="line-54"></a> <a name="line-55"></a><span class='hs-comment'>-- Changed for multi-parameter type classes</span> <a name="line-56"></a> <a name="line-57"></a><a name="checkAssertion"></a><span class='hs-definition'>checkAssertion</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsAsst</span> <a name="line-58"></a><span class='hs-definition'>checkAssertion</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkAssertion'</span> <span class='hs-conid'>[]</span> <a name="line-59"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>checkAssertion'</span> <span class='hs-varid'>ts</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyCon</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-60"></a> <span class='hs-varid'>checkAssertion'</span> <span class='hs-varid'>ts</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyApp</span> <span class='hs-varid'>a</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkAssertion'</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <a name="line-61"></a> <span class='hs-varid'>checkAssertion'</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal class assertion"</span> <a name="line-62"></a> <a name="line-63"></a> <a name="line-64"></a><a name="checkDataHeader"></a><span class='hs-definition'>checkDataHeader</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsQualType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsContext</span><span class='hs-layout'>,</span><span class='hs-conid'>HsName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-65"></a><span class='hs-definition'>checkDataHeader</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsQualType</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-66"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkSimple</span> <span class='hs-str'>"data/newtype"</span> <span class='hs-varid'>t</span> <span class='hs-conid'>[]</span> <a name="line-67"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>cs</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-68"></a> <a name="line-69"></a><a name="checkClassHeader"></a><span class='hs-definition'>checkClassHeader</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsQualType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsContext</span><span class='hs-layout'>,</span><span class='hs-conid'>HsName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-70"></a><span class='hs-definition'>checkClassHeader</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsQualType</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-71"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkSimple</span> <span class='hs-str'>"class"</span> <span class='hs-varid'>t</span> <span class='hs-conid'>[]</span> <a name="line-72"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>cs</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-73"></a> <a name="line-74"></a><a name="checkSimple"></a><span class='hs-definition'>checkSimple</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsName</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>HsName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsName</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-75"></a><span class='hs-definition'>checkSimple</span> <span class='hs-varid'>kw</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyApp</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyVar</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkSimple</span> <span class='hs-varid'>kw</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <a name="line-76"></a><span class='hs-definition'>checkSimple</span> <span class='hs-sel'>_kw</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyCon</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnQual</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <a name="line-77"></a><span class='hs-definition'>checkSimple</span> <span class='hs-varid'>kw</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Illegal "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>kw</span> <span class='hs-varop'>++</span> <span class='hs-str'>" declaration"</span><span class='hs-layout'>)</span> <a name="line-78"></a> <a name="line-79"></a><a name="checkInstHeader"></a><span class='hs-definition'>checkInstHeader</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsQualType</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsContext</span><span class='hs-layout'>,</span><span class='hs-conid'>HsQName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsType</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-80"></a><span class='hs-definition'>checkInstHeader</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsQualType</span> <span class='hs-varid'>cs</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-81"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkInsts</span> <span class='hs-varid'>t</span> <span class='hs-conid'>[]</span> <a name="line-82"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>cs</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-83"></a> <a name="line-84"></a><a name="checkInsts"></a><span class='hs-definition'>checkInsts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsType</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsType</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>HsQName</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsType</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-85"></a><span class='hs-definition'>checkInsts</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyApp</span> <span class='hs-varid'>l</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkInsts</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-86"></a><span class='hs-definition'>checkInsts</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsTyCon</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <a name="line-87"></a><span class='hs-definition'>checkInsts</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal instance declaration"</span> <a name="line-88"></a> <a name="line-89"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-90"></a><span class='hs-comment'>-- Checking Patterns.</span> <a name="line-91"></a> <a name="line-92"></a><span class='hs-comment'>-- We parse patterns as expressions and check for valid patterns below,</span> <a name="line-93"></a><span class='hs-comment'>-- converting the expression into a pattern at the same time.</span> <a name="line-94"></a> <a name="line-95"></a><a name="checkPattern"></a><span class='hs-definition'>checkPattern</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsPat</span> <a name="line-96"></a><span class='hs-definition'>checkPattern</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span> <a name="line-97"></a> <a name="line-98"></a><a name="checkPat"></a><span class='hs-definition'>checkPat</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsPat</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsPat</span> <a name="line-99"></a><span class='hs-definition'>checkPat</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsCon</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPApp</span> <span class='hs-varid'>c</span> <span class='hs-varid'>args</span><span class='hs-layout'>)</span> <a name="line-100"></a><span class='hs-definition'>checkPat</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsApp</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-101"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>x</span> <span class='hs-conid'>[]</span> <a name="line-102"></a> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>args</span><span class='hs-layout'>)</span> <a name="line-103"></a><span class='hs-definition'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>of</span> <a name="line-104"></a> <span class='hs-conid'>HsVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnQual</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPVar</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <a name="line-105"></a> <span class='hs-conid'>HsLit</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPLit</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <a name="line-106"></a> <span class='hs-conid'>HsInfixApp</span> <span class='hs-varid'>l</span> <span class='hs-varid'>op</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-107"></a> <span class='hs-varid'>l</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>l</span> <span class='hs-conid'>[]</span> <a name="line-108"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>r</span> <span class='hs-conid'>[]</span> <a name="line-109"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>op</span> <span class='hs-keyword'>of</span> <a name="line-110"></a> <span class='hs-conid'>HsQConOp</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPInfixApp</span> <span class='hs-varid'>l</span> <span class='hs-varid'>c</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <a name="line-111"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>patFail</span> <a name="line-112"></a> <span class='hs-conid'>HsTuple</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-113"></a> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <a name="line-114"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPTuple</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <a name="line-115"></a> <span class='hs-conid'>HsList</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-116"></a> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <a name="line-117"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPList</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <a name="line-118"></a> <span class='hs-conid'>HsParen</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-119"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span> <a name="line-120"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPParen</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-121"></a> <span class='hs-conid'>HsAsPat</span> <span class='hs-varid'>n</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-122"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span> <a name="line-123"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPAsPat</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-124"></a> <span class='hs-conid'>HsWildCard</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>HsPWildCard</span> <a name="line-125"></a> <span class='hs-conid'>HsIrrPat</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-126"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span> <a name="line-127"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPIrrPat</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-128"></a> <span class='hs-conid'>HsRecConstr</span> <span class='hs-varid'>c</span> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-129"></a> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkPatField</span> <span class='hs-varid'>fs</span> <a name="line-130"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPRec</span> <span class='hs-varid'>c</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span> <a name="line-131"></a> <span class='hs-conid'>HsNegApp</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsLit</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPNeg</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPLit</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-132"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>patFail</span> <a name="line-133"></a> <a name="line-134"></a><span class='hs-definition'>checkPat</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>patFail</span> <a name="line-135"></a> <a name="line-136"></a><a name="checkPatField"></a><span class='hs-definition'>checkPatField</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsFieldUpdate</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsPatField</span> <a name="line-137"></a><span class='hs-definition'>checkPatField</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFieldUpdate</span> <span class='hs-varid'>n</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-138"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPat</span> <span class='hs-varid'>e</span> <span class='hs-conid'>[]</span> <a name="line-139"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPFieldPat</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-140"></a> <a name="line-141"></a><a name="patFail"></a><span class='hs-definition'>patFail</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <a name="line-142"></a><span class='hs-definition'>patFail</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Parse error in pattern"</span> <a name="line-143"></a> <a name="line-144"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-145"></a><span class='hs-comment'>-- Check Expression Syntax</span> <a name="line-146"></a> <a name="line-147"></a><a name="checkExpr"></a><span class='hs-definition'>checkExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsExp</span> <a name="line-148"></a><span class='hs-definition'>checkExpr</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>of</span> <a name="line-149"></a> <span class='hs-conid'>HsVar</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>e</span> <a name="line-150"></a> <span class='hs-conid'>HsCon</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>e</span> <a name="line-151"></a> <span class='hs-conid'>HsLit</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>e</span> <a name="line-152"></a> <span class='hs-conid'>HsInfixApp</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>op</span> <span class='hs-varid'>e2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check2Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-conid'>HsInfixApp</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</span> <a name="line-153"></a> <span class='hs-conid'>HsApp</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check2Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-conid'>HsApp</span> <a name="line-154"></a> <span class='hs-conid'>HsNegApp</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-conid'>HsNegApp</span> <a name="line-155"></a> <span class='hs-conid'>HsLambda</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsLambda</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>ps</span><span class='hs-layout'>)</span> <a name="line-156"></a> <span class='hs-conid'>HsLet</span> <span class='hs-varid'>bs</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsLet</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <a name="line-157"></a> <span class='hs-conid'>HsIf</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>e3</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check3Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>e3</span> <span class='hs-conid'>HsIf</span> <a name="line-158"></a> <span class='hs-conid'>HsCase</span> <span class='hs-varid'>e</span> <span class='hs-varid'>alts</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-159"></a> <span class='hs-varid'>alts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkAlt</span> <span class='hs-varid'>alts</span> <a name="line-160"></a> <span class='hs-varid'>e</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e</span> <a name="line-161"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsCase</span> <span class='hs-varid'>e</span> <span class='hs-varid'>alts</span><span class='hs-layout'>)</span> <a name="line-162"></a> <span class='hs-conid'>HsDo</span> <span class='hs-varid'>stmts</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-163"></a> <span class='hs-varid'>stmts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkStmt</span> <span class='hs-varid'>stmts</span> <a name="line-164"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsDo</span> <span class='hs-varid'>stmts</span><span class='hs-layout'>)</span> <a name="line-165"></a> <span class='hs-conid'>HsTuple</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>checkManyExprs</span> <span class='hs-varid'>es</span> <span class='hs-conid'>HsTuple</span> <a name="line-166"></a> <span class='hs-conid'>HsList</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>checkManyExprs</span> <span class='hs-varid'>es</span> <span class='hs-conid'>HsList</span> <a name="line-167"></a> <span class='hs-conid'>HsParen</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-conid'>HsParen</span> <a name="line-168"></a> <span class='hs-conid'>HsLeftSection</span> <span class='hs-varid'>e</span> <span class='hs-varid'>op</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-conid'>HsLeftSection</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</span> <a name="line-169"></a> <span class='hs-conid'>HsRightSection</span> <span class='hs-varid'>op</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsRightSection</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</span> <a name="line-170"></a> <span class='hs-conid'>HsRecConstr</span> <span class='hs-varid'>c</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-171"></a> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkField</span> <span class='hs-varid'>fields</span> <a name="line-172"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsRecConstr</span> <span class='hs-varid'>c</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <a name="line-173"></a> <span class='hs-conid'>HsRecUpdate</span> <span class='hs-varid'>e</span> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-174"></a> <span class='hs-varid'>fields</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkField</span> <span class='hs-varid'>fields</span> <a name="line-175"></a> <span class='hs-varid'>e</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e</span> <a name="line-176"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsRecUpdate</span> <span class='hs-varid'>e</span> <span class='hs-varid'>fields</span><span class='hs-layout'>)</span> <a name="line-177"></a> <span class='hs-conid'>HsEnumFrom</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-conid'>HsEnumFrom</span> <a name="line-178"></a> <span class='hs-conid'>HsEnumFromTo</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check2Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-conid'>HsEnumFromTo</span> <a name="line-179"></a> <span class='hs-conid'>HsEnumFromThen</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check2Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-conid'>HsEnumFromThen</span> <a name="line-180"></a> <span class='hs-conid'>HsEnumFromThenTo</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>e3</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check3Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>e3</span> <span class='hs-conid'>HsEnumFromThenTo</span> <a name="line-181"></a> <span class='hs-conid'>HsListComp</span> <span class='hs-varid'>e</span> <span class='hs-varid'>stmts</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-182"></a> <span class='hs-varid'>stmts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkStmt</span> <span class='hs-varid'>stmts</span> <a name="line-183"></a> <span class='hs-varid'>e</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e</span> <a name="line-184"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsListComp</span> <span class='hs-varid'>e</span> <span class='hs-varid'>stmts</span><span class='hs-layout'>)</span> <a name="line-185"></a> <span class='hs-conid'>HsExpTypeSig</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>e</span> <span class='hs-varid'>ty</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-186"></a> <span class='hs-varid'>e</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e</span> <a name="line-187"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsExpTypeSig</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>e</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <a name="line-188"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Parse error in expression"</span> <a name="line-189"></a> <a name="line-190"></a><a name="check1Expr"></a><span class='hs-comment'>-- type signature for polymorphic recursion!!</span> <a name="line-191"></a><span class='hs-definition'>check1Expr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <a name="line-192"></a><span class='hs-definition'>check1Expr</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-193"></a> <span class='hs-varid'>e1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e1</span> <a name="line-194"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>e1</span><span class='hs-layout'>)</span> <a name="line-195"></a> <a name="line-196"></a><a name="check2Exprs"></a><span class='hs-definition'>check2Exprs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <a name="line-197"></a><span class='hs-definition'>check2Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-198"></a> <span class='hs-varid'>e1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e1</span> <a name="line-199"></a> <span class='hs-varid'>e2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e2</span> <a name="line-200"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span><span class='hs-layout'>)</span> <a name="line-201"></a> <a name="line-202"></a><a name="check3Exprs"></a><span class='hs-definition'>check3Exprs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <a name="line-203"></a><span class='hs-definition'>check3Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>e3</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-204"></a> <span class='hs-varid'>e1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e1</span> <a name="line-205"></a> <span class='hs-varid'>e2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e2</span> <a name="line-206"></a> <span class='hs-varid'>e3</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>e3</span> <a name="line-207"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-varid'>e3</span><span class='hs-layout'>)</span> <a name="line-208"></a> <a name="line-209"></a><a name="checkManyExprs"></a><span class='hs-definition'>checkManyExprs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsExp</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>HsExp</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <a name="line-210"></a><span class='hs-definition'>checkManyExprs</span> <span class='hs-varid'>es</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-211"></a> <span class='hs-varid'>es</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkExpr</span> <span class='hs-varid'>es</span> <a name="line-212"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>es</span><span class='hs-layout'>)</span> <a name="line-213"></a> <a name="line-214"></a><a name="checkAlt"></a><span class='hs-definition'>checkAlt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsAlt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsAlt</span> <a name="line-215"></a><span class='hs-definition'>checkAlt</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsAlt</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>p</span> <span class='hs-varid'>galts</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-216"></a> <span class='hs-varid'>galts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkGAlts</span> <span class='hs-varid'>galts</span> <a name="line-217"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsAlt</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>p</span> <span class='hs-varid'>galts</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <a name="line-218"></a> <a name="line-219"></a><a name="checkGAlts"></a><span class='hs-definition'>checkGAlts</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsGuardedAlts</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsGuardedAlts</span> <a name="line-220"></a><span class='hs-definition'>checkGAlts</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsUnGuardedAlt</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-conid'>HsUnGuardedAlt</span> <a name="line-221"></a><span class='hs-definition'>checkGAlts</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsGuardedAlts</span> <span class='hs-varid'>galts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-222"></a> <span class='hs-varid'>galts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkGAlt</span> <span class='hs-varid'>galts</span> <a name="line-223"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsGuardedAlts</span> <span class='hs-varid'>galts</span><span class='hs-layout'>)</span> <a name="line-224"></a> <a name="line-225"></a><a name="checkGAlt"></a><span class='hs-definition'>checkGAlt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsGuardedAlt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsGuardedAlt</span> <a name="line-226"></a><span class='hs-definition'>checkGAlt</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsGuardedAlt</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>check2Exprs</span> <span class='hs-varid'>e1</span> <span class='hs-varid'>e2</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsGuardedAlt</span> <span class='hs-varid'>loc</span><span class='hs-layout'>)</span> <a name="line-227"></a> <a name="line-228"></a><a name="checkStmt"></a><span class='hs-definition'>checkStmt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsStmt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsStmt</span> <a name="line-229"></a><span class='hs-definition'>checkStmt</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsGenerator</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>p</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsGenerator</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-230"></a><span class='hs-definition'>checkStmt</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsQualifier</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-conid'>HsQualifier</span> <a name="line-231"></a><span class='hs-definition'>checkStmt</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>HsLetStmt</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>s</span> <a name="line-232"></a> <a name="line-233"></a><a name="checkField"></a><span class='hs-definition'>checkField</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsFieldUpdate</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsFieldUpdate</span> <a name="line-234"></a><span class='hs-definition'>checkField</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFieldUpdate</span> <span class='hs-varid'>n</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>check1Expr</span> <span class='hs-varid'>e</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFieldUpdate</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-235"></a> <a name="line-236"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-237"></a><span class='hs-comment'>-- Check Equation Syntax</span> <a name="line-238"></a> <a name="line-239"></a><a name="checkValDef"></a><span class='hs-definition'>checkValDef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>SrcLoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HsRhs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsDecl</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsDecl</span> <a name="line-240"></a><span class='hs-definition'>checkValDef</span> <span class='hs-varid'>srcloc</span> <span class='hs-varid'>lhs</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>whereBinds</span> <span class='hs-keyglyph'>=</span> <a name="line-241"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>isFunLhs</span> <span class='hs-varid'>lhs</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>of</span> <a name="line-242"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-243"></a> <span class='hs-varid'>ps</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>checkPattern</span> <span class='hs-varid'>es</span> <a name="line-244"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFunBind</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsMatch</span> <span class='hs-varid'>srcloc</span> <span class='hs-varid'>f</span> <span class='hs-varid'>ps</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>whereBinds</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-245"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-246"></a> <span class='hs-varid'>lhs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkPattern</span> <span class='hs-varid'>lhs</span> <a name="line-247"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPatBind</span> <span class='hs-varid'>srcloc</span> <span class='hs-varid'>lhs</span> <span class='hs-varid'>rhs</span> <span class='hs-varid'>whereBinds</span><span class='hs-layout'>)</span> <a name="line-248"></a> <a name="line-249"></a><span class='hs-comment'>-- A variable binding is parsed as an HsPatBind.</span> <a name="line-250"></a> <a name="line-251"></a><a name="isFunLhs"></a><span class='hs-definition'>isFunLhs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsExp</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsName</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsExp</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-252"></a><span class='hs-definition'>isFunLhs</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsInfixApp</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsQVarOp</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnQual</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>op</span><span class='hs-layout'>,</span> <span class='hs-varid'>l</span><span class='hs-conop'>:</span><span class='hs-varid'>r</span><span class='hs-conop'>:</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <a name="line-253"></a><span class='hs-definition'>isFunLhs</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsApp</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnQual</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-conop'>:</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <a name="line-254"></a><span class='hs-definition'>isFunLhs</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsApp</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsParen</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isFunLhs</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-conop'>:</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <a name="line-255"></a><span class='hs-definition'>isFunLhs</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsApp</span> <span class='hs-varid'>f</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>es</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isFunLhs</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-conop'>:</span><span class='hs-varid'>es</span><span class='hs-layout'>)</span> <a name="line-256"></a><span class='hs-definition'>isFunLhs</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span> <a name="line-257"></a> <a name="line-258"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-259"></a><span class='hs-comment'>-- In a class or instance body, a pattern binding must be of a variable.</span> <a name="line-260"></a> <a name="line-261"></a><a name="checkClassBody"></a><span class='hs-definition'>checkClassBody</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsDecl</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsDecl</span><span class='hs-keyglyph'>]</span> <a name="line-262"></a><span class='hs-definition'>checkClassBody</span> <span class='hs-varid'>decls</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-263"></a> <span class='hs-varid'>mapM_</span> <span class='hs-varid'>checkMethodDef</span> <span class='hs-varid'>decls</span> <a name="line-264"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>decls</span> <a name="line-265"></a> <a name="line-266"></a><a name="checkMethodDef"></a><span class='hs-definition'>checkMethodDef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsDecl</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span> <a name="line-267"></a><span class='hs-definition'>checkMethodDef</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPatBind</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPVar</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-268"></a><span class='hs-definition'>checkMethodDef</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsPatBind</span> <span class='hs-varid'>loc</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-269"></a> <span class='hs-varid'>fail</span> <span class='hs-str'>"illegal method definition"</span> <span class='hs-varop'>`atSrcLoc`</span> <span class='hs-varid'>loc</span> <a name="line-270"></a><span class='hs-definition'>checkMethodDef</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-271"></a> <a name="line-272"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-273"></a><span class='hs-comment'>-- Check that an identifier or symbol is unqualified.</span> <a name="line-274"></a><span class='hs-comment'>-- For occasions when doing this in the grammar would cause conflicts.</span> <a name="line-275"></a> <a name="line-276"></a><a name="checkUnQual"></a><span class='hs-definition'>checkUnQual</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsQName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsName</span> <a name="line-277"></a><span class='hs-definition'>checkUnQual</span> <span class='hs-layout'>(</span><span class='hs-conid'>Qual</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal qualified name"</span> <a name="line-278"></a><span class='hs-definition'>checkUnQual</span> <span class='hs-layout'>(</span><span class='hs-conid'>UnQual</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>n</span> <a name="line-279"></a><span class='hs-definition'>checkUnQual</span> <span class='hs-layout'>(</span><span class='hs-conid'>Special</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal special name"</span> <a name="line-280"></a> <a name="line-281"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-282"></a><span class='hs-comment'>-- Miscellaneous utilities</span> <a name="line-283"></a> <a name="line-284"></a><a name="checkPrec"></a><span class='hs-definition'>checkPrec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>Int</span> <a name="line-285"></a><span class='hs-definition'>checkPrec</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-num'>0</span> <span class='hs-varop'><=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>i</span> <span class='hs-varop'><=</span> <span class='hs-num'>9</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromInteger</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <a name="line-286"></a><span class='hs-definition'>checkPrec</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Illegal precedence "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <a name="line-287"></a> <a name="line-288"></a><a name="mkRecConstrOrUpdate"></a><span class='hs-definition'>mkRecConstrOrUpdate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HsExp</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsFieldUpdate</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>HsExp</span> <a name="line-289"></a><span class='hs-definition'>mkRecConstrOrUpdate</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsCon</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>fs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsRecConstr</span> <span class='hs-varid'>c</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span> <a name="line-290"></a><span class='hs-definition'>mkRecConstrOrUpdate</span> <span class='hs-varid'>e</span> <span class='hs-varid'>fs</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsRecUpdate</span> <span class='hs-varid'>e</span> <span class='hs-varid'>fs</span><span class='hs-layout'>)</span> <a name="line-291"></a><span class='hs-definition'>mkRecConstrOrUpdate</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Empty record update"</span> <a name="line-292"></a> <a name="line-293"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-294"></a><span class='hs-comment'>-- Reverse a list of declarations, merging adjacent HsFunBinds of the</span> <a name="line-295"></a><span class='hs-comment'>-- same name and checking that their arities match.</span> <a name="line-296"></a> <a name="line-297"></a><a name="checkRevDecls"></a><span class='hs-definition'>checkRevDecls</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsDecl</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>HsDecl</span><span class='hs-keyglyph'>]</span> <a name="line-298"></a><span class='hs-definition'>checkRevDecls</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mergeFunBinds</span> <span class='hs-conid'>[]</span> <a name="line-299"></a> <span class='hs-keyword'>where</span> <a name="line-300"></a> <span class='hs-varid'>mergeFunBinds</span> <span class='hs-varid'>revDs</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>revDs</span> <a name="line-301"></a> <span class='hs-varid'>mergeFunBinds</span> <span class='hs-varid'>revDs</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFunBind</span> <span class='hs-varid'>ms1</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>HsMatch</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>name</span> <span class='hs-varid'>ps</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>ds1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-302"></a> <span class='hs-varid'>mergeMatches</span> <span class='hs-varid'>ms1</span> <span class='hs-varid'>ds1</span> <a name="line-303"></a> <span class='hs-keyword'>where</span> <a name="line-304"></a> <span class='hs-varid'>arity</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ps</span> <a name="line-305"></a> <span class='hs-varid'>mergeMatches</span> <span class='hs-varid'>ms'</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFunBind</span> <span class='hs-varid'>ms</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>HsMatch</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>name'</span> <span class='hs-varid'>ps'</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <a name="line-306"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>name'</span> <span class='hs-varop'>==</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <a name="line-307"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ps'</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>arity</span> <a name="line-308"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"arity mismatch for '"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>prettyPrint</span> <span class='hs-varid'>name</span> <span class='hs-varop'>++</span> <span class='hs-str'>"'"</span><span class='hs-layout'>)</span> <a name="line-309"></a> <span class='hs-varop'>`atSrcLoc`</span> <span class='hs-varid'>loc</span> <a name="line-310"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>mergeMatches</span> <span class='hs-layout'>(</span><span class='hs-varid'>ms</span><span class='hs-varop'>++</span><span class='hs-varid'>ms'</span><span class='hs-layout'>)</span> <span class='hs-varid'>ds</span> <a name="line-311"></a> <span class='hs-varid'>mergeMatches</span> <span class='hs-varid'>ms'</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mergeFunBinds</span> <span class='hs-layout'>(</span><span class='hs-conid'>HsFunBind</span> <span class='hs-varid'>ms'</span><span class='hs-conop'>:</span><span class='hs-varid'>revDs</span><span class='hs-layout'>)</span> <span class='hs-varid'>ds</span> <a name="line-312"></a> <span class='hs-varid'>mergeFunBinds</span> <span class='hs-varid'>revDs</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mergeFunBinds</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>revDs</span><span class='hs-layout'>)</span> <span class='hs-varid'>ds</span> </pre></body> </html>
