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<h3>

Simon Peyton Jones pushed to branch wip/T18412

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b">e37cbc69</a></strong>

<div>

<span>by Simon Peyton Jones</span>

<i>at 2020-07-14T16:41:03+01:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve typechecking of NPlusK patterns

This patch (due to Richard Eisenberg) improves

documentation of the wrapper returned by tcSubMult

(see Note [Wrapper returned from tcSubMult] in

 GHC.Tc.Utils.Unify).

And, more substantially, it cleans up the multiplicity

handling in the typechecking of NPlusKPat

</pre>

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<h4>6 changed files:</h4>

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<li class="file-stats">

<a href="#65e2067fbb7377818b6cadff0531f44029499948">

compiler/GHC/HsToCore/Binds.hs

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<li class="file-stats">

<a href="#902811828741e6bcd64702935bbb54edbbd070ef">

compiler/GHC/Tc/Gen/Expr.hs

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<li class="file-stats">

<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">

compiler/GHC/Tc/Gen/Pat.hs

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<li class="file-stats">

<a href="#46e7b59eca287d43c19d0d8902b41f5d04f0d268">

compiler/GHC/Tc/Types/Evidence.hs

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<a href="#f021c52a6ccf306e88c9f760b2aee33b180ba341">

compiler/GHC/Tc/Utils/Env.hs

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<li class="file-stats">

<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">

compiler/GHC/Tc/Utils/Unify.hs

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<h4>Changes:</h4>

<li id="65e2067fbb7377818b6cadff0531f44029499948">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b#65e2067fbb7377818b6cadff0531f44029499948"><strong>compiler/GHC/HsToCore/Binds.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1141,6 +1141,7 @@ dsHsWrapper (WpCast co)       = ASSERT(coercionRole co == Representational)</td>

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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell">                                <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkCastDs</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">co</span></span>

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<pre style="margin: 0;"> <span id="LC1142" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsWrapper</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpEvApp</span> <span class="n" style="color: #333;">tm</span><span class="p">)</span>      <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">core_tm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">dsEvTerm</span> <span class="n" style="color: #333;">tm</span></span>

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<pre style="margin: 0;"> <span id="LC1143" class="line" lang="haskell">                                   <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">App</span> <span class="n" style="color: #333;">e</span> <span class="n" style="color: #333;">core_tm</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC1144" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wrapper returned from tcSubMult] in GHC.Tc.Utils.Unify.</span></span>

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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"><span class="n" style="color: #333;">dsHsWrapper</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WpMultCoercion</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isReflexiveCo</span> <span class="n" style="color: #333;">co</span><span class="p">))</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell">                                         <span class="n" style="color: #333;">errDs</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Multiplicity coercions are currently not supported"</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell">                                     <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">e</span> <span class="p">}</span></span>

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<li id="902811828741e6bcd64702935bbb54edbbd070ef">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="365" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="365" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -365,7 +365,7 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>

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<pre style="margin: 0;"> <span id="LC365" class="line" lang="haskell">           <span class="n" style="color: #333;">matchActualFunTysRho</span> <span class="n" style="color: #333;">doc</span> <span class="n" style="color: #333;">orig1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">arg1</span><span class="p">))</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">arg1_ty</span></span>

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<pre style="margin: 0;"> <span id="LC366" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC367" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSubMult</span> <span class="kt" style="color: #458; font-weight: 600;">AppOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">(</span><span class="n" style="color: #333;">scaledMult</span> <span class="n" style="color: #333;">arg2_sigma</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC368" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

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<pre style="margin: 0;"> <span id="LC369" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;"> <span id="LC370" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- When ($) becomes multiplicity-polymorphic, then the above check will</span></span>

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<pre style="margin: 0;"> <span id="LC371" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- need to go. But in the meantime, it would produce ill-typed</span></span>

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<br>

</li>

<li id="3ee8be814b6c6727880deab3772e6af922524bf0">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -343,7 +343,7 @@ tc_lpats tys penv pats</td>

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<pre style="margin: 0;"> <span id="LC343" class="line" lang="haskell">               <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"tc_lpats"</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>

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<pre style="margin: 0;">-<span id="LC346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"><span class="n" style="color: #333;">checkManyPattern</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span></span>

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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"><span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSubMult</span> <span class="kt" style="color: #458; font-weight: 600;">NonLinearPatternOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="p">(</span><span class="n" style="color: #333;">scaledMult</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -358,7 +358,7 @@ tc_pat pat_ty penv ps_pat thing_inside = case ps_pat of</td>

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<pre style="margin: 0;"> <span id="LC358" class="line" lang="haskell">        <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">id</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcPatBndr</span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">pat_ty</span></span>

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<pre style="margin: 0;"> <span id="LC359" class="line" lang="haskell">        <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">mult_wrap</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckUsage</span> <span class="n" style="color: #333;">name</span> <span class="p">(</span><span class="n" style="color: #333;">scaledMult</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell">                              <span class="n" style="color: #333;">tcExtendIdEnv1</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">thing_inside</span></span>

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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="363" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

363

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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrapPat</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mult_wrap</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarPat</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">id</span><span class="p">))</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>

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<td class="diff-line-num old_line" data-linenumber="364" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="372" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="372" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -372,7 +372,7 @@ tc_pat pat_ty penv ps_pat thing_inside = case ps_pat of</td>

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<pre style="margin: 0;"> <span id="LC372" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="373" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC373" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">LazyPat</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="374" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC374" class="line" lang="haskell">        <span class="p">{</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="375" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="375" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC375" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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<td class="diff-line-num new old_line" data-linenumber="376" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC376" class="line" lang="haskell">        <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">pat_ct</span><span class="p">))</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="377" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC377" class="line" lang="haskell">                <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_lpat</span> <span class="n" style="color: #333;">pat_ty</span> <span class="p">(</span><span class="n" style="color: #333;">makeLazy</span> <span class="n" style="color: #333;">penv</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="378" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell">                   <span class="n" style="color: #333;">captureConstraints</span> <span class="n" style="color: #333;">thing_inside</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -390,14 +390,14 @@ tc_pat pat_ty penv ps_pat thing_inside = case ps_pat of</td>

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<td class="diff-line-num new_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="391" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

391

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<td class="diff-line-num new_line" data-linenumber="391" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

391

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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">WildPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell">        <span class="p">{</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="394" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

</pre>

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394

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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="395" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

395

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395

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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expTypeToType</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="396" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

396

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396

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<pre style="margin: 0;"> <span id="LC396" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrapPat</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WildPat</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>

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<td class="diff-line-num old_line" data-linenumber="397" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

397

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397

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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="398" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

398

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398

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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">AsPat</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">nm_loc</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

399

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<td class="diff-line-num new_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

399

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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell">        <span class="p">{</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

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<td class="diff-line-num old old_line" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

400

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<td class="diff-line-num new_line old" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC400" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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400

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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

</pre>

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401

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401

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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell">        <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">bndr_id</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">nm_loc</span> <span class="p">(</span><span class="n" style="color: #333;">tcPatBndr</span> <span class="n" style="color: #333;">penv</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span></span>

</pre>

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402

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402

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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell">        <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcExtendIdEnv1</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">bndr_id</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="403" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

403

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403

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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell">                         <span class="n" style="color: #333;">tc_lpat</span> <span class="p">(</span><span class="n" style="color: #333;">pat_ty</span> <span class="p">`</span><span class="n" style="color: #333;">scaledSet</span><span class="p">`(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">bndr_id</span><span class="p">))</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="414" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="414" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -414,7 +414,7 @@ tc_pat pat_ty penv ps_pat thing_inside = case ps_pat of</td>

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<td class="diff-line-num old_line" data-linenumber="414" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

414

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<td class="diff-line-num new_line" data-linenumber="414" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

414

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<pre style="margin: 0;"> <span id="LC414" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="415" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

415

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<td class="diff-line-num new_line" data-linenumber="415" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

415

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<pre style="margin: 0;"> <span id="LC415" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">ViewPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">expr</span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>

</pre>

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416

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<td class="diff-line-num new_line" data-linenumber="416" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

416

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<pre style="margin: 0;"> <span id="LC416" class="line" lang="haskell">        <span class="p">{</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="417" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

417

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<td class="diff-line-num new_line old" data-linenumber="417" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC417" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="418" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="417" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC417" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- It should be possible to have view patterns at linear (or otherwise</span></span>

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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell">         <span class="c1" style="color: #998; font-style: italic;">-- non-Many) multiplicity. But it is not clear at the moment what</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -586,7 +586,7 @@ Fortunately that's what matchExpectedFunTySigma returns anyway.</td>

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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When there is no negation, neg_lit_ty and lit_ty are the same</span></span>

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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">NPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">over_lit</span><span class="p">)</span> <span class="n" style="color: #333;">mb_neg</span> <span class="n" style="color: #333;">eq</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>

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<pre style="margin: 0;"> <span id="LC588" class="line" lang="haskell">        <span class="p">{</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

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<pre style="margin: 0;">-<span id="LC589" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

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<pre style="margin: 0;"> <span id="LC590" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- It may be possible to refine linear pattern so that they work in</span></span>

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<pre style="margin: 0;"> <span id="LC592" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- linear environments. But it is not clear how useful this is.</span></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="630" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -630,10 +630,6 @@ There are two bits of rebindable syntax:</td>

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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lit1_ty and lit2_ty could conceivably be different.</span></span>

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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">var_ty is the type inferred for x, the variable in the pattern.</span></span>

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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If the pushed-down pattern type isn't a tau-type, the two pat_ty's</span></span>

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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">above could conceivably be different specializations.  So we use</span></span>

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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expTypeToType on pat_ty before proceeding.</span></span>

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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we need to type-check the literal twice, because it is used</span></span>

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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">twice, and may be used at different types. The second HsOverLit stored in the</span></span>

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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">AST is used for the subtraction operation.</span></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -643,16 +639,16 @@ AST is used for the subtraction operation.</td>

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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">NPlusKPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">nm_loc</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC640" class="line" lang="haskell">               <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">lit</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ge</span> <span class="n" style="color: #333;">minus</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>

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<pre style="margin: 0;"> <span id="LC641" class="line" lang="haskell">        <span class="p">{</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

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<pre style="margin: 0;">-<span id="LC647" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">pat_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expTypeToType</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">scaledThing</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_ty</span></span><span class="p"><span class="idiff right">)</span></span></span>

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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell">        <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">let</span></span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LiteralOrigin</span> <span class="n" style="color: #333;">lit</span></span>

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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell">        <span class="p">;</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pat_exp_ty</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">scaledThing</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_ty</span></span></span>

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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell">        <span class="idiff left right">     </span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LiteralOrigin</span> <span class="n" style="color: #333;">lit</span></span>

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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell">        <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">lit1'</span><span class="p">,</span> <span class="n" style="color: #333;">ge'</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSyntaxOp</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ge</span> <span class="p">[</span><span class="n" style="color: #333;"><span class="idiff left">synKnownType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat</span>_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">]</span></span>

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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSyntaxOp</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ge</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SynType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_exp</span>_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">]</span></span>

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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell">                                  <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">boolTy</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell">               <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">[</span><span class="n" style="color: #333;">lit1_ty</span><span class="p">]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>

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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell">               <span class="n" style="color: #333;">newOverloadedLit</span> <span class="n" style="color: #333;">lit</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">lit1_ty</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell">        <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">lit2'</span><span class="p">,</span> <span class="n" style="color: #333;">minus_wrap</span><span class="p">,</span> <span class="n" style="color: #333;">bndr_id</span><span class="p">),</span> <span class="n" style="color: #333;">minus'</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSyntaxOpGen</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">minus</span> <span class="p">[</span><span class="n" style="color: #333;"><span class="idiff left">synKnownType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat</span>_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">SynAny</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell">            <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSyntaxOpGen</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">minus</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">SynType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pat_exp</span>_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">SynRho</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">SynAny</span> <span class="o" style="font-weight: 600;">$</span></span>

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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell">               <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">[</span><span class="n" style="color: #333;">lit2_ty</span><span class="p">,</span> <span class="n" style="color: #333;">var_ty</span><span class="p">]</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>

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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell">               <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lit2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOverloadedLit</span> <span class="n" style="color: #333;">lit</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">lit2_ty</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC654" class="line" lang="haskell">                  <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">bndr_id</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">nm_loc</span> <span class="o" style="font-weight: 600;">$</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="662" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -662,6 +658,7 @@ AST is used for the subtraction operation.</td>

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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell">                           <span class="c1" style="color: #998; font-style: italic;">-- minus_wrap is applicable to minus'</span></span>

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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell">                  <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">lit2'</span><span class="p">,</span> <span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">bndr_id</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC660" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">pat_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">pat_exp_ty</span></span>

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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- The Report says that n+k patterns must be in Integral</span></span>

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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- but it's silly to insist on this in the RebindableSyntax case</span></span>

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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">unlessM</span> <span class="p">(</span><span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">RebindableSyntax</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="981" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -984,7 +981,7 @@ tcPatSynPat penv (L con_span _) pat_syn pat_ty arg_pats thing_inside</td>

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984

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<td class="diff-line-num new_line" data-linenumber="981" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

981

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<pre style="margin: 0;"> <span id="LC981" class="line" lang="haskell">              <span class="n" style="color: #333;">req_theta'</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">tenv</span> <span class="n" style="color: #333;">req_theta</span></span>

</pre>

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985

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982

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<pre style="margin: 0;"> <span id="LC982" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="986" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

986

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983

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<pre style="margin: 0;"> <span id="LC983" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">mult_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkManyPattern</span> <span class="n" style="color: #333;">pat_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

987

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<td class="diff-line-num new_line old" data-linenumber="984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC987" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">tcSubMult's wrapper] in Tc</span>Unify.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="988" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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984

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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Wrapper returned from tcSubMult] in GHC.Tc.Utils.</span>Unify.</span></span>

</pre>

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988

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985

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<pre style="margin: 0;"> <span id="LC985" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

989

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986

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<pre style="margin: 0;"> <span id="LC986" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_sub_type</span> <span class="n" style="color: #333;">penv</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pat_ty</span><span class="p">)</span> <span class="n" style="color: #333;">ty'</span></span>

</pre>

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987

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<pre style="margin: 0;"> <span id="LC987" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcPatSynPat"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_syn</span> <span class="o" style="font-weight: 600;">$$</span></span>

</pre>

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<li id="46e7b59eca287d43c19d0d8902b41f5d04f0d268">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b#46e7b59eca287d43c19d0d8902b41f5d04f0d268"><strong>compiler/GHC/Tc/Types/Evidence.hs</strong></a>

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<pre style="margin: 0;"> <span id="LC229" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WpLet</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvBinds</span>             <span class="c1" style="color: #998; font-style: italic;">-- Non-empty (or possibly non-empty) evidence bindings,</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- so that the identity coercion is always exactly WpHole</span></span>

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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WpMultCoercion</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>

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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Note [Checking multiplicity coercions]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

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<td class="diff-line-num old old_line" data-linenumber="235" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

235

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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- This wrapper can be returned from tcSubMult.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

236

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<td class="diff-line-num new_line old" data-linenumber="232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- It is used in case a variable is used with multiplicity m1,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- we need it with multiplicity m2 and we have a coercion c :: m1 ~ m2.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Compiling such code would require multiplicity coercions in Core,</span></span>

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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- which we don't have. If the desugarer sees WpMultCoercion</span></span>

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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- with a non-reflexive coercion, it gives an error.</span></span>

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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- This is a temporary measure, as we don't really know yet exactly</span></span>

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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- what multiplicity coercions should be. But it serves as a good</span></span>

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243

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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- approximation for the first iteration for the first iteration of linear types.</span></span>

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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">WpMultCoercion</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span>     <span class="c1" style="color: #998; font-style: italic;">-- Require that a Coercion be reflexive; otherwise,</span></span>

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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- error in the desugarer. See GHC.Tc.Utils.Unify</span></span>

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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- Note [Wrapper returned from tcSubMult]</span></span>

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244

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236

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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC237" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Cannot derive Data instance because SDoc is not Data (it stores a function).</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- So we do it manually:</span></span>

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<br>

</li>

<li id="f021c52a6ccf306e88c9f760b2aee33b180ba341">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b#f021c52a6ccf306e88c9f760b2aee33b180ba341"><strong>compiler/GHC/Tc/Utils/Env.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -628,7 +628,8 @@ tcExtendLocalTypeEnv lcl_env@(TcLclEnv { tcl_env = lcl_type_env }) tc_ty_things</td>

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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="cd">-- | @tcCheckUsage name mult thing_inside@ runs @thing_inside@, checks that the</span></span>

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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- usage of @name@ is a submultiplicity of @mult@, and removes @name@ from the</span></span>

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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- usage environment. See also Note [tcSubMult's wrapper] in TcUnify.</span></span>

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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- usage environment. See also Note [Wrapper returned from tcSubMult] in</span></span>

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Utils.Unify, which applies to the wrapper returned from this function.</span></span>

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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckUsage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Mult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckUsage</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">id_mult</span> <span class="n" style="color: #333;">thing_inside</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">local_usage</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCollectingUsage</span> <span class="n" style="color: #333;">thing_inside</span></span>

</pre>

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<br>

</li>

<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e37cbc69a81f7fc07cb87cd8b3adeab377c3c52b#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="762" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="762" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -762,29 +762,29 @@ to a UserTypeCtxt of GenSigCtxt.  Why?</td>

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762

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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  ambiguity check, but we don't need one for each level within it,</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  and GHC.Tc.Utils.Unify.alwaysBuildImplication checks the UserTypeCtxt.</span></span>

</pre>

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764

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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  See Note [When to build an implication]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Wrapper returned from tcSubMult]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is no notion of multiplicity coercion in Core, therefore the wrapper</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="769" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">returned by tcSubMult (and derived functions such as tcCheckUsage and</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="770" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checkManyPattern) is quite unlike any other wrapper: it checks whether the</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercion produced by the constraint solver is trivial, producing a type error</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is it is not. This is implemented via the WpMultCoercion wrapper, as desugared</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by GHC.HsToCore.Binds.dsHsWrapper, which does the reflexivity check.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This wrapper needs to be placed in the term; otherwise, checking of the</span></span>

</pre>

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776

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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">eventual coercion won't be triggered during desugaring. But it can be put</span></span>

</pre>

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777

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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">anywhere, since it doesn't affect the desugared code.</span></span>

</pre>

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778

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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"></span>

</pre>

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779

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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why do we check this in the desugarer? It's a convenient place, since it's</span></span>

</pre>

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780

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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">right after all the constraints are solved. We need the constraints to be</span></span>

</pre>

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781

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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solved to check whether they are trivial or not. Plus there is precedent for</span></span>

</pre>

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782

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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type errors during desuraging (such as the levity polymorphism</span></span>

</pre>

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783

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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">restriction). An alternative would be to have a kind of constraint which can</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="784" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

784

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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only produce trivial evidence, then this check would happen in the constraint</span></span>

</pre>

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785

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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solver.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="786" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

786

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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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767

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787

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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"></span>

</pre>

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768

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<pre style="margin: 0;">-<span id="LC768" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [tcSubMult's wrapper]</span></span>

</pre>

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769

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<pre style="margin: 0;">-<span id="LC769" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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770

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<pre style="margin: 0;">-<span id="LC770" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- There is no notion of multiplicity coercion in Core, therefore the wrapper</span></span>

</pre>

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771

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<pre style="margin: 0;">-<span id="LC771" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returned by tcSubMult (and derived function such as tcCheckUsage and</span></span>

</pre>

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772

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<pre style="margin: 0;">-<span id="LC772" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checkManyPattern) is quite unlike any other wrapper: it checks whether the</span></span>

</pre>

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773

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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- coercion produced by the constraint solver is trivial and disappears (it</span></span>

</pre>

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774

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<pre style="margin: 0;">-<span id="LC774" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- produces a type error is the constraint is not trivial). See [Checking</span></span>

</pre>

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775

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<pre style="margin: 0;">-<span id="LC775" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- multiplicity coercions] in TcEvidence.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="776" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

776

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC776" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="777" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

777

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This wrapper need to be placed in the term, otherwise checking of the</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="778" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

778

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- eventual coercion won't be triggered during desuraging. But it can be put</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="779" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

779

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- anywhere, since it doesn't affect the desugared code.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="780" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

780

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="781" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

781

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC781" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why do we check this in the desugarer? It's a convenient place, since it's</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="782" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

782

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- right after all the constraints are solved. We need the constraints to be</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="783" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

783

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC783" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- solved to check whether they are trivial or not. Plus there are precedent for</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="784" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

784

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC784" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type errors during desuraging (such as the levity polymorphism</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="785" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

785

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- restriction). An alternative would be to have a kind of constraints which can</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="786" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

786

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- only produce trivial evidence, then this check would happen in the constraint</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="787" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

787

</td>

<td class="diff-line-num new_line old" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- solver.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

788

</td>

<td class="diff-line-num new_line" data-linenumber="788" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

788

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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubMult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Mult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Mult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="789" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

789

</td>

<td class="diff-line-num new_line" data-linenumber="789" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

789

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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubMult</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">w_actual</span> <span class="n" style="color: #333;">w_expected</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="790" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

790

</td>

<td class="diff-line-num new_line" data-linenumber="790" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

790

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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">w1</span><span class="p">,</span> <span class="n" style="color: #333;">w2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isMultMul</span> <span class="n" style="color: #333;">w_actual</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

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