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<h3>
Krzysztof Gogolewski pushed to branch wip/fix-zipping
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/b4a7261e982e92e08d71e76746e7e07fed8b47ae">b4a7261e</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2019-05-17T23:01:58Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix missing unboxed tuple RuntimeReps (#16565)
Unboxed tuples and sums take extra RuntimeRep arguments,
which must be manually passed in a few places.
Three of them were missed.
This error was hidden because zipping functions in TyCoRep
ignored lists with mismatching length. This is now fixed;
the lengths are now checked by calling zipEqual.
As suggested in #16565, I moved checking for isTyVar and
isCoVar to zipTyEnv and zipCoEnv.
</pre>
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.hs
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<li class="file-stats">
<a href="#e983ab78d999ad95d1a9ba58ce459c2a4950a639">
compiler/hsSyn/HsPat.hs
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<li class="file-stats">
<a href="#88310e11ff3891efda62ffaa54c2830f1b147778">
compiler/types/TyCoRep.hs
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<li class="file-stats">
<a href="#7dc313da4c00f2541cb5e519a5e4a0eac7751a2a">
compiler/utils/Util.hs
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<h4>Changes:</h4>
<li id="bd37d71fa68b0980d832d992b427fd6a6bdb891d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b4a7261e982e92e08d71e76746e7e07fed8b47ae#bd37d71fa68b0980d832d992b427fd6a6bdb891d"><strong>compiler/deSugar/Check.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">@@ -43,6 +43,7 @@ import FastString</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DataCon</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">PatSyn</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HscTypes</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CompleteMatch</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">BasicTypes</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Boxity</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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47
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DsMonad</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">TcSimplify</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">tcCheckSatisfiability</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1078" 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="1079" 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">@@ -1078,12 +1079,17 @@ translatePat fam_insts pat = case pat of</td>
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1078
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1079
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TuplePat</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">ps</span> <span class="n" style="color: #333;">boxity</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1079
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_ps</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">translatePatVec</span> <span class="n" style="color: #333;">fam_insts</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">ps</span><span class="p">)</span></span>
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1080
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tuple_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="p">(</span><span class="n" style="color: #333;">tupleDataCon</span> <span class="n" style="color: #333;">boxity</span> <span class="p">(</span><span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">ps</span><span class="p">))</span></span>
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1081
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<pre style="margin: 0;">-<span id="LC1081" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">vanillaConPattern</span> <span class="n" style="color: #333;">tuple_con</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">concat</span> <span class="n" style="color: #333;">tidy_ps</span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="n" style="color: #333;">tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">boxity</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Boxed</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tys</span></span>
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1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unboxed tuple RuntimeRep vars]</span></span>
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unboxed</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">vanillaConPattern</span> <span class="n" style="color: #333;">tuple_con</span> <span class="n" style="color: #333;">tys'</span> <span class="p">(</span><span class="n" style="color: #333;">concat</span> <span class="n" style="color: #333;">tidy_ps</span><span class="p">)]</span></span>
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1082
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<pre style="margin: 0;"> <span id="LC1087" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1088" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SumPat</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">arity</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="LC1089" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_p</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">translatePat</span> <span class="n" style="color: #333;">fam_insts</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">sum_con</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="p">(</span><span class="n" style="color: #333;">sumDataCon</span> <span class="n" style="color: #333;">alt</span> <span class="n" style="color: #333;">arity</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1086" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">vanillaConPattern</span> <span class="n" style="color: #333;">sum_con</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">tidy_p</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unboxed tuple RuntimeRep vars]</span></span>
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<pre style="margin: 0;">+<span id="LC1092" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">[</span><span class="n" style="color: #333;">vanillaConPattern</span> <span class="n" style="color: #333;">sum_con</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">tidy_p</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1093" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1094" 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="LC1095" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Not supposed to happen</span></span>
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<li id="e983ab78d999ad95d1a9ba58ce459c2a4950a639">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/b4a7261e982e92e08d71e76746e7e07fed8b47ae#e983ab78d999ad95d1a9ba58ce459c2a4950a639"><strong>compiler/hsSyn/HsPat.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">@@ -622,8 +622,12 @@ mkPrefixConPat dc pats tys</td>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyTcEvBinds</span></span>
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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_args</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PrefixCon</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys<span class="idiff left right">'</span></span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pat_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">tys'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isUnboxedTupleCon</span> <span class="n" style="color: #333;">dc</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isUnboxedSumCon</span> <span class="n" style="color: #333;">dc</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unboxed tuple RuntimeRep vars]</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"><span class="n" style="color: #333;">mkNilPat</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;">OutPat</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GhcPass</span> <span class="n" style="color: #333;">p</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"><span class="n" style="color: #333;">mkNilPat</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrefixConPat</span> <span class="n" style="color: #333;">nilDataCon</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span><span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/b4a7261e982e92e08d71e76746e7e07fed8b47ae#88310e11ff3891efda62ffaa54c2830f1b147778"><strong>compiler/types/TyCoRep.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">@@ -2965,10 +2965,6 @@ unionTCvSubst (TCvSubst in_scope1 tenv1 cenv1) (TCvSubst in_scope2 tenv2 cenv2)</td>
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<pre style="margin: 0;"> <span id="LC2965" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- environment. No CoVars, please!</span></span>
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2966
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<pre style="margin: 0;"> <span id="LC2966" class="line" lang="haskell"><span class="n" style="color: #333;">zipTvSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</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;">TCvSubst</span></span>
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2967
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<pre style="margin: 0;"> <span id="LC2967" class="line" lang="haskell"><span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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2968
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<pre style="margin: 0;">-<span id="LC2968" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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2969
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<pre style="margin: 0;">-<span id="LC2969" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">neLength</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span></span>
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2970
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<pre style="margin: 0;">-<span id="LC2970" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"zipTvSubst"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>
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2971
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<pre style="margin: 0;">-<span id="LC2971" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2968
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<pre style="margin: 0;"> <span id="LC2968" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">tys</span><span class="p">))</span> <span class="n" style="color: #333;">tenv</span></span>
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2973
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2969
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<pre style="margin: 0;"> <span id="LC2969" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2974
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<pre style="margin: 0;"> <span id="LC2970" class="line" lang="haskell"> <span class="n" style="color: #333;">tenv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipTyEnv</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</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">@@ -2977,25 +2973,19 @@ zipTvSubst tvs tys</td>
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2977
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<pre style="margin: 0;"> <span id="LC2973" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- environment. No TyVars, please!</span></span>
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2978
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<pre style="margin: 0;"> <span id="LC2974" class="line" lang="haskell"><span class="n" style="color: #333;">zipCvSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span></span>
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2979
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<pre style="margin: 0;"> <span id="LC2975" class="line" lang="haskell"><span class="n" style="color: #333;">zipCvSubst</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;">-<span id="LC2980" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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2981
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<pre style="margin: 0;">-<span id="LC2981" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">neLength</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span></span>
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2982
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<pre style="margin: 0;">-<span id="LC2982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"zipCvSubst"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>
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<pre style="margin: 0;">-<span id="LC2983" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC2976" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCos</span> <span class="n" style="color: #333;">cos</span><span class="p">))</span> <span class="n" style="color: #333;">emptyTvSubstEnv</span> <span class="n" style="color: #333;">cenv</span></span>
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2985
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2977
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<pre style="margin: 0;"> <span id="LC2977" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2986
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2978
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<pre style="margin: 0;"> <span id="LC2978" class="line" lang="haskell"> <span class="n" style="color: #333;">cenv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipCoEnv</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span></span>
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2987
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2979
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<pre style="margin: 0;"> <span id="LC2979" class="line" lang="haskell"></span>
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2980
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<pre style="margin: 0;"> <span id="LC2980" class="line" lang="haskell"><span class="n" style="color: #333;">zipTCvSubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">]</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;">TCvSubst</span></span>
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2981
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<pre style="margin: 0;"> <span id="LC2981" class="line" lang="haskell"><span class="n" style="color: #333;">zipTCvSubst</span> <span class="n" style="color: #333;">tcvs</span> <span class="n" style="color: #333;">tys</span></span>
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2990
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<pre style="margin: 0;">-<span id="LC2990" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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<pre style="margin: 0;">-<span id="LC2991" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">neLength</span> <span class="n" style="color: #333;">tcvs</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC2992" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprTrace</span> <span class="s" style="color: #d14;">"zipTCvSubst"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tcvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>
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2993
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<pre style="margin: 0;">-<span id="LC2993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC2982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zip_tcvsubst</span> <span class="n" style="color: #333;">tcvs</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</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="n" style="color: #333;">tys</span><span class="p">))</span></span>
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2995
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<pre style="margin: 0;"> <span id="LC2983" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">zip_tcvsubst</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">]</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;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span></span>
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<pre style="margin: 0;"> <span id="LC2984" class="line" lang="haskell"> <span class="n" style="color: #333;">zip_tcvsubst</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">tvs</span><span class="p">)</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;">tys</span><span class="p">)</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC2985" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zip_tcvsubst</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">extendTCvSubst</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2998" class="line" lang="haskell"> <span class="n" style="color: #333;">zip_tcvsubst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst</span> <span class="c1" style="color: #998; font-style: italic;">-- empty case</span></span>
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<pre style="margin: 0;">+<span id="LC2986" class="line" lang="haskell"> <span class="n" style="color: #333;">zip_tcvsubst</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst</span> <span class="c1" style="color: #998; font-style: italic;">-- empty case</span></span>
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<pre style="margin: 0;">+<span id="LC2987" class="line" lang="haskell"> <span class="n" style="color: #333;">zip_tcvsubst</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;">pprPanic</span> <span class="s" style="color: #d14;">"zipTCvSubst: length mismatch"</span></span>
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<pre style="margin: 0;">+<span id="LC2988" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tcvs</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2989" class="line" lang="haskell"></span>
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3000
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2990
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<pre style="margin: 0;"> <span id="LC2990" class="line" lang="haskell"><span class="cd">-- | Generates the in-scope set for the 'TCvSubst' from the types in the</span></span>
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3001
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2991
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<pre style="margin: 0;"> <span id="LC2991" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- incoming environment. No CoVars, please!</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">@@ -3011,6 +3001,10 @@ mkTvSubstPrs prs =</td>
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3011
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3001
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<pre style="margin: 0;"> <span id="LC3001" class="line" lang="haskell"></span>
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3012
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3002
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<pre style="margin: 0;"> <span id="LC3002" class="line" lang="haskell"><span class="n" style="color: #333;">zipTyEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</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;">TvSubstEnv</span></span>
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3013
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3003
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<pre style="margin: 0;"> <span id="LC3003" class="line" lang="haskell"><span class="n" style="color: #333;">zipTyEnv</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">tys</span></span>
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3004
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<pre style="margin: 0;">+<span id="LC3004" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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3005
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<pre style="margin: 0;">+<span id="LC3005" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tyvars</span><span class="p">)</span></span>
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3006
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<pre style="margin: 0;">+<span id="LC3006" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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3007
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<pre style="margin: 0;">+<span id="LC3007" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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3014
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3008
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<pre style="margin: 0;"> <span id="LC3008" 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;">all</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isCoercionTy</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="p">)</span></span>
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3015
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3009
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<pre style="margin: 0;"> <span id="LC3009" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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3016
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3010
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<pre style="margin: 0;"> <span id="LC3010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There used to be a special case for when</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">@@ -3027,7 +3021,12 @@ zipTyEnv tyvars tys</td>
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3027
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3021
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<pre style="margin: 0;"> <span id="LC3021" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Simplest fix is to nuke the "optimisation"</span></span>
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3028
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3022
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<pre style="margin: 0;"> <span id="LC3022" class="line" lang="haskell"></span>
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3029
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3023
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<pre style="margin: 0;"> <span id="LC3023" class="line" lang="haskell"><span class="n" style="color: #333;">zipCoEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CvSubstEnv</span></span>
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3030
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<pre style="margin: 0;">-<span id="LC3030" class="line" lang="haskell"><span class="n" style="color: #333;">zipCoEnv</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"zipCoEnv"</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span></span>
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3024
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<pre style="margin: 0;">+<span id="LC3024" class="line" lang="haskell"><span class="n" style="color: #333;">zipCoEnv</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span></span>
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3025
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<pre style="margin: 0;">+<span id="LC3025" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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3026
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<pre style="margin: 0;">+<span id="LC3026" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isCoVar</span> <span class="n" style="color: #333;">cvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zipCoEnv"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cvs</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC3029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"zipCoEnv"</span> <span class="n" style="color: #333;">cvs</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3030" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3031" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC3032" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="n" style="color: #333;">ins</span> <span class="n" style="color: #333;">tenv</span> <span class="n" style="color: #333;">cenv</span><span class="p">)</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">@@ -35,7 +35,7 @@ module Util (</td>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lengthExceeds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lengthIs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lengthIsNot</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">lengthAtLeast</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lengthAtMost</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lengthLessThan</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">listLengthCmp</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">atLength</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">equalLength</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">neLength</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">compareLength</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">leLength</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ltLength</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">equalLength</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">compareLength</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">leLength</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ltLength</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isSingleton</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">only</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">singleton</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">notNull</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">snocView</span><span class="p">,</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">@@ -535,12 +535,6 @@ equalLength [] [] = True</td>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"><span class="n" style="color: #333;">equalLength</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;">xs</span><span class="p">)</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;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">equalLength</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="n" style="color: #333;">equalLength</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="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">neLength</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ True if length xs /= length ys</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"><span class="n" style="color: #333;">neLength</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"><span class="n" style="color: #333;">neLength</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;">xs</span><span class="p">)</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;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">neLength</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell"><span class="n" style="color: #333;">neLength</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="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"></span>
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544
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">compareLength</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ordering</span></span>
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545
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539
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"><span class="n" style="color: #333;">compareLength</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EQ</span></span>
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546
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540
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"><span class="n" style="color: #333;">compareLength</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;">xs</span><span class="p">)</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;">ys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">compareLength</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span></span>
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