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<h3>

Richard Eisenberg pushed to branch wip/T18998

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/eb5e44547603513cad06ce6ef0392d15506f5f27">eb5e4454</a></strong>

<div>

<span>by Richard Eisenberg</span>

<i>at 2020-12-11T15:13:42-05:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unfortunate dirty hack to overcome #18998.

See commentary in tcCheckUsage.

Close #18998.

Test case: typecheck/should_compile/T18998

</pre>

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<h4>4 changed files:</h4>

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<a href="#f021c52a6ccf306e88c9f760b2aee33b180ba341">

compiler/GHC/Tc/Utils/Env.hs

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<a href="#d1ca8fe66c86b35ccb7ad60d01d08c5b900c9cd7">

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+

testsuite/tests/typecheck/should_compile/T18998.hs

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<a href="#78689bc221f02626c527e58f02d18e320d2cbdb8">

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+

testsuite/tests/typecheck/should_compile/T18998b.hs

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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">

testsuite/tests/typecheck/should_compile/all.T

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<h4>Changes:</h4>

<li id="f021c52a6ccf306e88c9f760b2aee33b180ba341">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb5e44547603513cad06ce6ef0392d15506f5f27#f021c52a6ccf306e88c9f760b2aee33b180ba341"><strong>compiler/GHC/Tc/Utils/Env.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="102" 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="102" 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">@@ -102,6 +102,7 @@ import GHC.Core.ConLike</td>

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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>

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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>

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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</span></span>

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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span></span>

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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Class</span></span>

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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="663" 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="664" 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">@@ -663,10 +664,41 @@ tcCheckUsage name id_mult thing_inside</td>

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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;">wrapper</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">actual_u</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;"> <span id="LC665" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">Bottom</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">idHsWrapper</span></span>

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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">Zero</span>     <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tcSubMult</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageEnvironmentOf</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="n" style="color: #333;">id_mult</span></span>

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<td class="diff-line-num new_line old" data-linenumber="667" 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="LC666" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">MUsage</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tcSubMult</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageEnvironmentOf</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">id_mult</span></span>

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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">MUsage</span> <span class="n" style="color: #333;">m</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;">m</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">m</span></span>

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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell">                              <span class="p">;</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promote_mult</span> <span class="n" style="color: #333;">m</span></span>

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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell">                              <span class="p">;</span> <span class="n" style="color: #333;">tcSubMult</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageEnvironmentOf</span> <span class="n" style="color: #333;">name</span><span class="p">)</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">id_mult</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC670" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">tcEmitBindingUsage</span> <span class="p">(</span><span class="n" style="color: #333;">deleteUE</span> <span class="n" style="color: #333;">uenv</span> <span class="n" style="color: #333;">name</span><span class="p">)</span></span>

</pre>

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668

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671

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<pre style="margin: 0;"> <span id="LC671" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">wrapper</span> <span class="p">}</span></span>

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669

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672

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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- This is gross. The problem is in test case typecheck/should_compile/T18998:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">--   f :: a %1-> Id n a -> Id n a</span></span>

</pre>

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675

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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">--   f x (MkId _) = MkId x</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- where MkId is a GADT constructor. Multiplicity polymorphism of constructors</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- invents a new multiplicity variable p[2] for the application MkId x. This</span></span>

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678

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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- variable is at level 2, bumped because of the GADT pattern-match (MkId _).</span></span>

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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- We eventually unify the variable with One, due to the call to tcSubMult in</span></span>

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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- tcCheckUsage. But by then, we're at TcLevel 1, and so the level-check</span></span>

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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- fails.</span></span>

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<pre style="margin: 0;">+<span id="LC682" 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="LC683" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- What to do? If we did inference "for real", the sub-multiplicity constraint</span></span>

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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- would end up in the implication of the GADT pattern-match, and all would</span></span>

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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- be well. But we don't have a real sub-multiplicity constraint to put in</span></span>

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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- the implication. (Multiplicity inference works outside the usual generate-</span></span>

</pre>

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687

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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- constraints-and-solve scheme.) Here, where the multiplicity arrives, we</span></span>

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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- must promote all multiplicity variables to reflect this outer TcLevel.</span></span>

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689

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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- It's reminiscent of floating a constraint, really, so promotion is</span></span>

</pre>

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690

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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- appropriate. The promoteTcType function works only on types of kind TYPE rr,</span></span>

</pre>

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691

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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- so we can't use it here. Thus, this dirtiness.</span></span>

</pre>

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692

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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- It works nicely in practice.</span></span>

</pre>

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694

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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">promote_mult</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapTyCo</span> <span class="n" style="color: #333;">mapper</span></span>

</pre>

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695

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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell">    <span class="n" style="color: #333;">mapper</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="p">{</span> <span class="n" style="color: #333;">tcm_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTyVar</span> <span class="n" style="color: #333;">tv</span></span>

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696

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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell">                                                    <span class="p">;</span> <span class="n" style="color: #333;">zonkTcTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>

</pre>

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697

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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell">                        <span class="p">,</span> <span class="n" style="color: #333;">tcm_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoVarCo</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span></span>

</pre>

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698

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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell">                        <span class="p">,</span> <span class="n" style="color: #333;">tcm_hole</span>  <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">h</span>  <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkHoleCo</span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>

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699

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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell">                        <span class="p">,</span> <span class="n" style="color: #333;">tcm_tycobinder</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">tcv</span> <span class="n" style="color: #333;">_flag</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">()</span><span class="p">,</span> <span class="n" style="color: #333;">tcv</span><span class="p">)</span></span>

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<td class="diff-line-num new new_line" data-linenumber="700" 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="LC700" class="line" lang="haskell">                        <span class="p">,</span> <span class="n" style="color: #333;">tcm_tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC701" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>

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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             The TcBinderStack</span></span>

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<br>

</li>

<li id="d1ca8fe66c86b35ccb7ad60d01d08c5b900c9cd7">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb5e44547603513cad06ce6ef0392d15506f5f27#d1ca8fe66c86b35ccb7ad60d01d08c5b900c9cd7"><strong>testsuite/tests/typecheck/should_compile/T18998.hs</strong></a>

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE LinearTypes, GADTs, DataKinds, KindSignatures #-}</span></span>

</pre>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>

</pre>

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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this caused a TcLevel assertion failure</span></span>

</pre>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="5" 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">

5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18998</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>

</pre>

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7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types</span></span>

</pre>

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.TypeLits</span></span>

</pre>

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9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>

</pre>

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10

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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11

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">MkId</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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12

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>

</pre>

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13

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="n" style="color: #333;">n</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;">Id</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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14

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkId</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkId</span> <span class="n" style="color: #333;">a</span></span></pre>

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<br>

</li>

<li id="78689bc221f02626c527e58f02d18e320d2cbdb8">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb5e44547603513cad06ce6ef0392d15506f5f27#78689bc221f02626c527e58f02d18e320d2cbdb8"><strong>testsuite/tests/typecheck/should_compile/T18998b.hs</strong></a>

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables, LinearTypes, DataKinds, TypeOperators, GADTs,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">             PolyKinds, ConstraintKinds, TypeApplications #-}</span></span>

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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>

</pre>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18998b</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.TypeLits</span></span>

</pre>

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7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Unsafe.Coerce</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Constraint</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="n" style="color: #333;">c</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">knowPred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KnownNat</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KnownNat</span> <span class="n" style="color: #333;">n</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">knowPred</span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unsafeCoerce</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Nat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="mi" style="color: #099;">0</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Alright, this breaks linearity for some unknown reason</span></span>

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">snoc</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">n</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;">KnownNat</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">snoc</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Nil</span></span>

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21

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">snoc</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="n" style="color: #333;">n'</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">knowPred</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KnownNat</span> <span class="n" style="color: #333;">n</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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22

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell">   <span class="kt" style="color: #458; font-weight: 600;">Dict</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">snoc</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="23" 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">

23

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This works fine</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="24" 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">

24

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="25" 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">

25

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">snoc'</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">1</span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">NList</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="26" 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">

26

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">snoc'</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Nil</span></span>

</pre>

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27

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">snoc'</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="n" style="color: #333;">snoc'</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span></pre>

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<li id="34fe7bf0e6fbf60effb28393399ba68666593909">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb5e44547603513cad06ce6ef0392d15506f5f27#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="737" 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="737" 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">@@ -737,3 +737,5 @@ test('InstanceGivenOverlap2', normal, compile, [''])</td>

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<td class="diff-line-num old_line" data-linenumber="737" 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">

737

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<td class="diff-line-num new_line" data-linenumber="737" 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">

737

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<pre style="margin: 0;"> <span id="LC737" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

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738

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<td class="diff-line-num new_line" data-linenumber="738" 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">

738

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<pre style="margin: 0;"> <span id="LC738" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="739" 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">

739

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<td class="diff-line-num new_line" data-linenumber="739" 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">

739

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<pre style="margin: 0;"> <span id="LC739" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18891</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="740" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="740" 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">

740

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<pre style="margin: 0;">+<span id="LC740" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18998</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="740" 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="741" 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">

741

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<pre style="margin: 0;">+<span id="LC741" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18998b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>

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