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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:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/69b1633104a43d5654e65f2c05fa6b73775936e2">69b16331</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2019-05-29T14:39:43Z</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.
This was not done in deSugar/Check.
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>
<ul>
<li class="file-stats">
<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.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="#02ab52057b25cd107220549e7027dd4c9a6ba32c">
compiler/types/TyCon.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/69b1633104a43d5654e65f2c05fa6b73775936e2#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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45
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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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46
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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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46
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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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1082
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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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<td class="diff-line-num new new_line" data-linenumber="1084" 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="LC1084" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unboxed tuple RuntimeRep vars] in TyCon</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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1084
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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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1085
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1090
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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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1086
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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] in TyCon</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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1093
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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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1095
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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="88310e11ff3891efda62ffaa54c2830f1b147778">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/69b1633104a43d5654e65f2c05fa6b73775936e2#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">@@ -2963,39 +2963,29 @@ unionTCvSubst (TCvSubst in_scope1 tenv1 cenv1) (TCvSubst in_scope2 tenv2 cenv2)</td>
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<pre style="margin: 0;"> <span id="LC2963" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2964" class="line" lang="haskell"><span class="cd">-- | Generates the in-scope set for the 'TCvSubst' from the types in the incoming</span></span>
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2965
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2965
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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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<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="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </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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<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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<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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<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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<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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<pre style="margin: 0;"> <span id="LC2971" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2972" class="line" lang="haskell"><span class="cd">-- | Generates the in-scope set for the 'TCvSubst' from the types in the incoming</span></span>
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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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<pre style="margin: 0;">-<span id="LC2978" 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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<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="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </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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<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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<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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<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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<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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<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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<pre style="margin: 0;"> <span id="LC2979" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2988" 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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<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="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </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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<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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<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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<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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2994
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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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2984
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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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2997
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2985
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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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2998
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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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<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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<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">@@ -3009,8 +2999,12 @@ mkTvSubstPrs prs =</td>
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<pre style="margin: 0;"> <span id="LC2999" class="line" lang="haskell"> <span class="n" style="color: #333;">and</span> <span class="p">[</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isCoercionTy</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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3000
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<pre style="margin: 0;"> <span id="LC3000" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">prs</span> <span class="p">]</span></span>
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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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<pre style="margin: 0;">-<span id="LC3012" 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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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="kt" style="color: #458; font-weight: 600;"><span class="idiff left">HasDebugCallStack</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=></span></span><span class="idiff right"> </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="diff-line-num unfold js-unfold new_line" data-linenumber="3020" 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">@@ -3026,8 +3020,13 @@ zipTyEnv tyvars tys</td>
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3026
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3020
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<pre style="margin: 0;"> <span id="LC3020" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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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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<pre style="margin: 0;">-<span id="LC3029" 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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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="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</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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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">@@ -358,13 +358,27 @@ Note [Unboxed tuple RuntimeRep vars]</td>
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<pre style="margin: 0;"> <span id="LC358" 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="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The contents of an unboxed tuple may have any representation. Accordingly,</span></span>
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<pre style="margin: 0;"> <span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the kind of the unboxed tuple constructor is runtime-representation</span></span>
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<pre style="margin: 0;">-<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">polymorphic. For example,</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">polymorphic.</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type constructor (2 kind arguments)</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (#,#) :: forall (q :: RuntimeRep) (r :: RuntimeRep).</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TYPE q -> TYPE r -> TYPE (TupleRep [q, r])</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Data constructor (4 type arguments)</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (#,#) :: forall (q :: RuntimeRep) (r :: RuntimeRep)</span></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (a :: TYPE q) (b :: TYPE r). a -> b -> (# a, b #)</span></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These extra tyvars (q and r) cause some delicate processing around tuples,</span></span>
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where we need to manually insert RuntimeRep arguments.</span></span>
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The same situation happens with unboxed sums: each alternative</span></span>
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">has its own RuntimeRep.</span></span>
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For boxed tuples, there is no levity polymorphism, and therefore</span></span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we add RuntimeReps only for the unboxed version.</span></span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Type constructor (no kind arguments)</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (,) :: Type -> Type -> Type</span></span>
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Data constructor (2 type arguments)</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (,) :: forall a b. a -> b -> (a, b)</span></span>
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<pre style="margin: 0;"> <span id="LC381" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (#,#) :: forall (q :: RuntimeRep) (r :: RuntimeRep). TYPE q -> TYPE r -> #</span></span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">These extra tyvars (v and w) cause some delicate processing around tuples,</span></span>
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<pre style="margin: 0;">-<span id="LC366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where we used to be able to assume that the tycon arity and the</span></span>
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<pre style="margin: 0;">-<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">datacon arity were the same.</span></span>
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Injective type families]</span></span>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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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<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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<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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<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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