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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/6febc444c0abea6c033174aa0e813c950b9b2877">6febc444</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2019-04-14T05:20:29Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix assertion failures reported in #16533
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<h4>4 changed files:</h4>
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<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
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<a href="#341aef35ac370771edf59ec6b9fbb31507fa6f18">
compiler/typecheck/TcSigs.hs
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<a href="#67a2fcd4f9dc88c950d518e4d2a458bd4228414f">
compiler/types/OptCoercion.hs
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<li class="file-stats">
<a href="#07ce9a046fb8ea6659690020b0a8551d94cfdf1c">
compiler/types/Type.hs
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<h4>Changes:</h4>
<li id="9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/6febc444c0abea6c033174aa0e813c950b9b2877#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a"><strong>compiler/typecheck/TcCanonical.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1015" 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="1015" 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">@@ -1015,7 +1015,7 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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1015
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Done: unify phi1 ~ phi2</span></span>
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<td class="diff-line-num old_line" data-linenumber="1016" 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">
1016
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndrs2</span></span>
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1017
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">bndrs2</span> <span class="p">)</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="n" style="color: #333;">phi1'</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">phi2</span><span class="p">)</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="n" style="color: #333;">phi1'</span> <span class="p">(</span><span class="n" style="color: #333;">substTy<span class="idiff left right">Unchecked</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">phi2</span><span class="p">)</span></span>
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1019
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"></span>
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1020
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"cna_eq_nc_forall"</span> <span class="c1" style="color: #998; font-style: italic;">-- case (s:ss) []</span></span>
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1021
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"></span>
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<li id="341aef35ac370771edf59ec6b9fbb31507fa6f18">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/6febc444c0abea6c033174aa0e813c950b9b2877#341aef35ac370771edf59ec6b9fbb31507fa6f18"><strong>compiler/typecheck/TcSigs.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="515" 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">@@ -515,7 +515,7 @@ tcInstSig hs_sig@(PartialSig { psig_hs_ty = hs_ty</td>
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515
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_prs</span></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcs</span></span>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcx</span></span>
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518
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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys<span class="idiff left right">Unchecked</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">theta</span></span>
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519
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tau</span> <span class="p">}</span></span>
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520
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"End partial sig }"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inst_sig</span><span class="p">)</span></span>
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521
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521
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">inst_sig</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/6febc444c0abea6c033174aa0e813c950b9b2877#67a2fcd4f9dc88c950d518e4d2a458bd4228414f"><strong>compiler/types/OptCoercion.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">@@ -118,8 +118,8 @@ optCoercion' env co</td>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">in_ty1</span> <span class="n" style="color: #333;">in_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">in_role</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">out_ty1</span> <span class="n" style="color: #333;">out_ty2</span><span class="p">,</span> <span class="n" style="color: #333;">out_role</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">out_co</span></span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">in_ty1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">out_ty1</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">in_ty2</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">out_ty2</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">substTy<span class="idiff left right">Unchecked</span></span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">in_ty1</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">out_ty1</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"> <span class="n" style="color: #333;">substTy<span class="idiff left right">Unchecked</span></span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">in_ty2</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">out_ty2</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="n" style="color: #333;">in_role</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">out_role</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"optCoercion changed types!"</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"in_co:"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/6febc444c0abea6c033174aa0e813c950b9b2877#07ce9a046fb8ea6659690020b0a8551d94cfdf1c"><strong>compiler/types/Type.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">@@ -1044,7 +1044,7 @@ piResultTys ty orig_args@(arg:args)</td>
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="n" style="color: #333;">init_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">orig_args</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC1045" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</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="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">-<span id="LC1047" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy<span class="idiff left right">Unchecked</span></span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">all_args</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">arg</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1050" 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="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span></span>
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