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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e538977b4791d4e9dfea6892abaf4e15a20aebc">4e538977</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-10-26T21:48:36-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Some small changes, mostly comments.
</pre>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cf175e03363960bc603572eaaffbf13c559f0c5">3cf175e0</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-10-26T23:22:46-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18875 by breaking type variable cycles.
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<h4>11 changed files:</h4>
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<li class="file-stats">
<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<li class="file-stats">
<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<li class="file-stats">
<a href="#344f534534e1418b7146783c94eecdf3d1d4ea71">
testsuite/tests/indexed-types/should_fail/Simple13.hs
→
testsuite/tests/indexed-types/should_compile/Simple13.hs
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<li class="file-stats">
<a href="#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e">
testsuite/tests/indexed-types/should_compile/all.T
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<li class="file-stats">
<a href="#3e0457789f3266c805563b6a84cef1dfb08aed7e">
testsuite/tests/indexed-types/should_fail/all.T
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<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
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<h4>Changes:</h4>
<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -29,7 +29,7 @@ module GHC.Core.Type (</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkAppTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAppTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitAppTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitAppTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">repSplitAppTys</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitAppTy_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">repSplitAppTy_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcRepSplitAppTy_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkVisFunTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkInvisFunTy</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mk<span class="idiff left">FunTy</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">mk</span>VisFunTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkInvisFunTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkVisFunTys</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkVisFunTyMany</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkInvisFunTyMany</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkVisFunTysMany</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkInvisFunTysMany</span><span class="p">,</span></span>
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<li id="89a2e0e1a3095c7a42b10f2819049908908080e8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/Unify.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1003" 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="1003" 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">@@ -1003,9 +1003,11 @@ unify_ty env ty1 (TyVarTy tv2) kco</td>
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uVar</span> <span class="p">(</span><span class="n" style="color: #333;">umSwapRn</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">tv2</span> <span class="n" style="color: #333;">ty1</span> <span class="p">(</span><span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span></span>
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1004
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1004
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"></span>
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1005
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"><span class="n" style="color: #333;">unify_ty</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">_kco</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: This keeps Constraint and Type distinct, as it should for use in the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1007" 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">
1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type-checker.</span></span>
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1006
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc1</span><span class="p">,</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_tc_app1</span></span>
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1007
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_tc_app2</span></span>
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<pre style="margin: 0;">-<span id="LC1008" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tc1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tc2</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">||</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tcIsLiftedTypeKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">&&</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcIsLiftedTypeKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tc1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tc2</span></span>
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<pre style="margin: 0;"> <span id="LC1011" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isInjectiveTyCon</span> <span class="n" style="color: #333;">tc1</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">unify_tys</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span></span>
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inj</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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">@@ -2305,12 +2305,18 @@ canEqCanLHSFinish ev eq_rel swapped lhs rhs</td>
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<pre style="margin: 0;"> <span id="LC2305" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">lhs_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;"> <span id="LC2306" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">eq_rel</span></span>
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<pre style="margin: 0;"> <span id="LC2307" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEqCanLHSFinish breaking a cycle"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2308" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">breakTyVarCycle</span> <span class="n" style="color: #333;"><span class="idiff left right">lhs_tv</span></span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC2308" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">breakTyVarCycle</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvLoc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC2309" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"new RHS:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2310" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPred</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">lhs_tv</span><span class="p">)</span> <span class="n" style="color: #333;">new_rhs</span></span>
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<pre style="margin: 0;"> <span id="LC2311" class="line" lang="haskell"> <span class="n" style="color: #333;">new_new_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_ev</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_pred</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2312" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">-<span id="LC2313" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_rhs</span><span class="p">,</span> <span class="n" style="color: #333;">cc_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2312" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (6) of Note [Type variable cycles in Givens]</span></span>
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<pre style="margin: 0;">+<span id="LC2313" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2314" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">anyRewritableTyVar</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">lhs_tv</span><span class="p">)</span> <span class="n" style="color: #333;">new_rhs</span></span>
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<pre style="margin: 0;">+<span id="LC2315" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Note [Type variable cycles in Givens] Detail (1)"</span></span>
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<pre style="margin: 0;">+<span id="LC2316" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_new_ev</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2317" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="n" style="color: #333;">mkIrredCt</span> <span class="n" style="color: #333;">status</span> <span class="n" style="color: #333;">new_ev</span><span class="p">)</span> <span class="p">}</span></span>
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2318
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<pre style="margin: 0;">+<span id="LC2318" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">+<span id="LC2319" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_rhs</span><span class="p">,</span> <span class="n" style="color: #333;">cc_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">})</span> <span class="p">}</span></span>
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2320
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<pre style="margin: 0;"> <span id="LC2320" class="line" lang="haskell"></span>
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2321
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<pre style="margin: 0;"> <span id="LC2321" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We must not use it for further rewriting!</span></span>
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2322
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<pre style="margin: 0;"> <span id="LC2322" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2610,43 +2616,39 @@ Instead, we detect this scenario by the following characteristics:</td>
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<pre style="margin: 0;"> <span id="LC2616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - a Given CEqCan constraint</span></span>
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2611
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2617
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<pre style="margin: 0;"> <span id="LC2617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - with a tyvar on its LHS</span></span>
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2612
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2618
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<pre style="margin: 0;"> <span id="LC2618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - with a soluble occurs-check failure</span></span>
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<pre style="margin: 0;">+<span id="LC2619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - and a nominal equality</span></span>
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2613
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2620
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<pre style="margin: 0;"> <span id="LC2620" class="line" lang="haskell"></span>
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2614
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<pre style="margin: 0;">-<span id="LC2614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Having identified the scenario, we create a fresh untouchable metavariable a'</span></span>
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2615
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<pre style="margin: 0;">-<span id="LC2615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(with MetaInfo CycleBreakerTv), and replace all occurrences of `a` in the RHS</span></span>
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2616
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<pre style="margin: 0;">-<span id="LC2616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a'. This is done by breakTyVarCycle. We have now disrupted the</span></span>
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2617
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<pre style="margin: 0;">-<span id="LC2617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">occurs-check problem and can make the CEqCan.</span></span>
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2621
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<pre style="margin: 0;">+<span id="LC2621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Having identified the scenario, we wish to replace all type family</span></span>
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2622
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<pre style="margin: 0;">+<span id="LC2622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications on the RHS with fresh metavariables (with MetaInfo</span></span>
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2623
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<pre style="margin: 0;">+<span id="LC2623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CycleBreakerTv). This is done in breakTyVarCycle. These metavariables are</span></span>
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2624
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<pre style="margin: 0;">+<span id="LC2624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">untouchable, but we also emit Givens relating the fresh variables to the type</span></span>
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<pre style="margin: 0;">+<span id="LC2625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">family applications they replace.</span></span>
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2626
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<pre style="margin: 0;"> <span id="LC2626" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Of course, we don't want <span class="idiff left right">a' leaking into e.g. error messages. So we</span></span></span>
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2620
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<pre style="margin: 0;">-<span id="LC2620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">restore the cycles by setting a' := a after we're done running the</span></span></span>
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2621
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<pre style="margin: 0;">-<span id="LC2621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">solver (in nestImplicTcS and runTcSWithEvBinds). This is done by</span></span></span>
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2622
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<pre style="margin: 0;">-<span id="LC2622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">restoreTyVarCycles, which uses the inert_tv_cycles field in InertSet,</span></span></span>
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2623
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<pre style="margin: 0;">-<span id="LC2623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which contains the pairings invented in breakTyVarCycle.</span></span>
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2627
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<pre style="margin: 0;">+<span id="LC2627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Of course, we don't want <span class="idiff left right">our fresh variables leaking into e.g. error messages.</span></span></span>
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2628
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<pre style="margin: 0;">+<span id="LC2628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">So we fill in the metavariables with their original type family applications</span></span></span>
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2629
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<pre style="margin: 0;">+<span id="LC2629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">after we're done running the solver (in nestImplicTcS and runTcSWithEvBinds).</span></span></span>
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2630
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<pre style="margin: 0;">+<span id="LC2630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">This is done by restoreTyVarCycles, which uses the inert_cycle_breakers field in</span></span></span>
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2631
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<pre style="margin: 0;">+<span id="LC2631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">InertSet, </span>which contains the pairings invented in breakTyVarCycle.</span></span>
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2632
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<pre style="margin: 0;"> <span id="LC2632" class="line" lang="haskell"></span>
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2625
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<pre style="margin: 0;">-<span id="LC2625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we don't have to think about evidence here, because the</span></span>
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2626
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<pre style="margin: 0;">-<span id="LC2626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loop-breaker variable just gets zonked right back to the original</span></span>
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2627
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<pre style="margin: 0;">-<span id="LC2627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one. By the time we examine the evidence, all traces of this trick</span></span>
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2628
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<pre style="margin: 0;">-<span id="LC2628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are very long gone.</span></span>
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<pre style="margin: 0;">+<span id="LC2633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In our example, we start with</span></span>
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2629
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2634
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<pre style="margin: 0;"> <span id="LC2634" class="line" lang="haskell"></span>
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2630
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<pre style="margin: 0;">-<span id="LC2630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">There are drawbacks of this approach:</span></span></span>
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2635
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<pre style="margin: 0;">+<span id="LC2635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> [G] a ~ Maybe (F a)</span></span></span>
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2631
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2636
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<pre style="margin: 0;"> <span id="LC2636" class="line" lang="haskell"></span>
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2632
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<pre style="margin: 0;">-<span id="LC2632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. This trick allows us to use a loopy Given once, but not twice.</span></span>
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2633
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<pre style="margin: 0;">-<span id="LC2633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> And it's possible for twice to be necessary. #18875:</span></span>
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<pre style="margin: 0;">+<span id="LC2637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We then change this to become</span></span>
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2634
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2638
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<pre style="margin: 0;"> <span id="LC2638" class="line" lang="haskell"></span>
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2635
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<pre style="margin: 0;">-<span id="LC2635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> type family G a b where</span></span></span>
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2636
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<pre style="margin: 0;">-<span id="LC2636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right"> G (Maybe c) d = d</span></span></span>
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2639
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<pre style="margin: 0;">+<span id="LC2639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">[G] a ~ Maybe cbv</span></span></span>
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2640
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<pre style="margin: 0;">+<span id="LC2640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">[G] F a ~ cbv</span></span></span>
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2641
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<pre style="margin: 0;"> <span id="LC2641" class="line" lang="haskell"></span>
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2638
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<pre style="margin: 0;">-<span id="LC2638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h :: (e ~ Maybe (G e f)) => e -> f</span></span>
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2639
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<pre style="margin: 0;">-<span id="LC2639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h (Just x) = x</span></span>
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<pre style="margin: 0;">+<span id="LC2642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and set cbv := F a after we're done solving.</span></span>
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2640
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2643
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<pre style="margin: 0;"> <span id="LC2643" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> In order to accept this, we have to use the Given twice, in order</span></span>
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2642
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<pre style="margin: 0;">-<span id="LC2642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for G e f to reduce to show that e ~ Maybe f.</span></span>
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2644
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<pre style="margin: 0;">+<span id="LC2644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are drawbacks of this approach:</span></span>
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2645
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<pre style="margin: 0;"> <span id="LC2645" class="line" lang="haskell"></span>
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2644
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<pre style="margin: 0;">-<span id="LC2644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">2</span>. We apply this trick only for Givens, never for Wanted or Derived.</span></span>
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2646
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<pre style="margin: 0;">+<span id="LC2646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">1</span>. We apply this trick only for Givens, never for Wanted or Derived.</span></span>
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2645
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2647
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<pre style="margin: 0;"> <span id="LC2647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It wouldn't make sense for Wanted, because Wanted never rewrite.</span></span>
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2646
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2648
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<pre style="margin: 0;"> <span id="LC2648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But it's conceivable that a Derived would benefit from this all.</span></span>
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2647
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2649
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<pre style="margin: 0;"> <span id="LC2649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> I doubt it would ever happen, though, so I'm holding off.</span></span>
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2650
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<pre style="margin: 0;"> <span id="LC2650" class="line" lang="haskell"></span>
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2649
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<pre style="margin: 0;">-<span id="LC2649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">3</span>. We don't use this trick for representational equalities, as there</span></span>
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<pre style="margin: 0;">+<span id="LC2651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">2</span>. We don't use this trick for representational equalities, as there</span></span>
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2650
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2652
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<pre style="margin: 0;"> <span id="LC2652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is no concrete use case where it is helpful (unlike for nominal</span></span>
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2651
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2653
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<pre style="margin: 0;"> <span id="LC2653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> equalities). Furthermore, because function applications can be</span></span>
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2652
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2654
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<pre style="margin: 0;"> <span id="LC2654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CanEqLHSs, but newtype applications cannot, the disparities between</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">@@ -2658,8 +2660,56 @@ There are drawbacks of this approach:</td>
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2658
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2660
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<pre style="margin: 0;"> <span id="LC2660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: (Coercible a (N a b), Coercible (N a b) b) => a -> b</span></span>
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2659
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2661
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<pre style="margin: 0;"> <span id="LC2661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = coerce</span></span>
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2660
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<pre style="margin: 0;"> <span id="LC2662" class="line" lang="haskell"></span>
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2661
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<pre style="margin: 0;">-<span id="LC2661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> failed with "Could not match 'b' with 'b'." Further work is saved</span></span>
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2662
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<pre style="margin: 0;">-<span id="LC2662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for when we have a concrete incentive to explore this dark corner.</span></span>
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2663
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<pre style="margin: 0;">+<span id="LC2663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> failed with "Could not match 'b' with 'b'." Further work is held off</span></span>
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<pre style="margin: 0;">+<span id="LC2664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> until when we have a concrete incentive to explore this dark corner.</span></span>
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<pre style="margin: 0;">+<span id="LC2665" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Details:</span></span>
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2667
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<pre style="margin: 0;">+<span id="LC2667" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (1) We don't look under foralls, at all, when substituting away type family</span></span>
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<pre style="margin: 0;">+<span id="LC2669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> applications, because doing so can never be fruitful. Recall that we</span></span>
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<pre style="margin: 0;">+<span id="LC2670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are in a case like [G] a ~ forall b. ... a .... Until we have a type</span></span>
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<pre style="margin: 0;">+<span id="LC2671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> family that can pull the body out from a forall, this will always be</span></span>
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<pre style="margin: 0;">+<span id="LC2672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> insoluble. Note also that the forall cannot be in an argument to a</span></span>
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2673
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<pre style="margin: 0;">+<span id="LC2673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family, or that outer type family application would already have</span></span>
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2674
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<pre style="margin: 0;">+<span id="LC2674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> been substituted away.</span></span>
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2675
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<pre style="margin: 0;">+<span id="LC2675" class="line" lang="haskell"></span>
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2676
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<pre style="margin: 0;">+<span id="LC2676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, we still must check to make sure that breakTyVarCycle actually</span></span>
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2677
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<pre style="margin: 0;">+<span id="LC2677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> succeeds in getting rid of all occurrences of the offending variable.</span></span>
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<pre style="margin: 0;">+<span id="LC2678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If one is hidden under a forall, this won't be true. So we perform</span></span>
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<pre style="margin: 0;">+<span id="LC2679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> an additional check after performing the substitution.</span></span>
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2680
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<pre style="margin: 0;">+<span id="LC2680" class="line" lang="haskell"></span>
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2681
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<pre style="margin: 0;">+<span id="LC2681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Skipping this check causes typecheck/should_fail/GivenForallLoop to loop.</span></span>
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2682
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<pre style="margin: 0;">+<span id="LC2682" class="line" lang="haskell"></span>
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2683
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<pre style="margin: 0;">+<span id="LC2683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2) Our goal here is to avoid loops in rewriting. We can thus skip looking</span></span>
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2684
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<pre style="margin: 0;">+<span id="LC2684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in coercions, as we don't rewrite in coercions.</span></span>
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2685
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<pre style="margin: 0;">+<span id="LC2685" class="line" lang="haskell"></span>
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2686
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<pre style="margin: 0;">+<span id="LC2686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (3) As we're substituting, we can build ill-kinded</span></span>
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2687
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<pre style="margin: 0;">+<span id="LC2687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> types. For example, if we have Proxy (F a) b, where (b :: F a), then</span></span>
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2688
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<pre style="margin: 0;">+<span id="LC2688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> replacing this with Proxy cbv b is ill-kinded. However, we will later</span></span>
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2689
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<pre style="margin: 0;">+<span id="LC2689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> set cbv := F a, and so the zonked type will be well-kinded again.</span></span>
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2690
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<pre style="margin: 0;">+<span id="LC2690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The temporary ill-kinded type hurts no one, and avoiding this would</span></span>
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2691
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<pre style="margin: 0;">+<span id="LC2691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> be quite painfully difficult.</span></span>
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2692
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<pre style="margin: 0;">+<span id="LC2692" class="line" lang="haskell"></span>
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2693
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<pre style="margin: 0;">+<span id="LC2693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (4) The evidence for the produced Givens is all just reflexive, because</span></span>
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2694
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<pre style="margin: 0;">+<span id="LC2694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we will eventually set the cycle-breaker variable to be the type family,</span></span>
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2695
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<pre style="margin: 0;">+<span id="LC2695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and then, after the zonk, all will be well.</span></span>
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2696
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<pre style="margin: 0;">+<span id="LC2696" class="line" lang="haskell"></span>
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2697
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<pre style="margin: 0;">+<span id="LC2697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (5) The approach here is inefficient. For instance, we could choose to</span></span>
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2698
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<pre style="margin: 0;">+<span id="LC2698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> affect only type family applications that mention the offending variable.</span></span>
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2699
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<pre style="margin: 0;">+<span id="LC2699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We could try to detect cases like a ~ (F a, F a) and use the same</span></span>
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2700
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<pre style="margin: 0;">+<span id="LC2700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tyvar to replace F a. (Cf. Note [Flattening] in GHC.Core.Unify, which</span></span>
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2701
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<pre style="margin: 0;">+<span id="LC2701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> goes to this extra effort.) There may be other opportunities for</span></span>
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2702
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<pre style="margin: 0;">+<span id="LC2702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> improvement. However, this is really a very small corner case, always</span></span>
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2703
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<pre style="margin: 0;">+<span id="LC2703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tickled by a user-written Given. The investment to craft a clever,</span></span>
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2704
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<pre style="margin: 0;">+<span id="LC2704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> performant solution seems unworthwhile.</span></span>
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2705
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<pre style="margin: 0;">+<span id="LC2705" class="line" lang="haskell"></span>
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2706
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<pre style="margin: 0;">+<span id="LC2706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (6) We often get the predicate associated with a constraint from its</span></span>
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2707
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<pre style="margin: 0;">+<span id="LC2707" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence. We thus must not only make sure the generated CEqCan's</span></span>
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2708
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<pre style="margin: 0;">+<span id="LC2708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fields have the updated RHS type, but we must also update the</span></span>
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2709
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<pre style="margin: 0;">+<span id="LC2709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence itself. As in Detail (4), we don't need to change the</span></span>
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2710
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<pre style="margin: 0;">+<span id="LC2710" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence term (as in e.g. rewriteEqEvidence) because the cycle</span></span>
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2711
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<pre style="margin: 0;">+<span id="LC2711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> breaker variables are all zonked away by the time we examine the</span></span>
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2712
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<pre style="margin: 0;">+<span id="LC2712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence.</span></span>
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2663
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2713
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<pre style="margin: 0;"> <span id="LC2713" class="line" lang="haskell"></span>
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2664
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2714
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<pre style="margin: 0;"> <span id="LC2714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2665
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2715
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<pre style="margin: 0;"> <span id="LC2715" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.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">@@ -559,6 +559,10 @@ flatten_one :: TcType -> FlatM (Xi, Coercion)</td>
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<pre style="margin: 0;"> <span id="LC559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Postcondition: Coercion :: Xi ~ TcType</span></span>
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<pre style="margin: 0;"> <span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The role on the result coercion matches the EqRel in the FlattenEnv</span></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenView</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening synonyms]</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty'</span></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"></span>
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566
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">xi</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span></span>
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563
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRole</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">mkReflCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">xi</span><span class="p">)</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">@@ -569,16 +573,8 @@ flatten_one (TyVarTy tv)</td>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flatten_app_tys</span> <span class="n" style="color: #333;">ty1</span> <span class="p">[</span><span class="n" style="color: #333;">ty2</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Expand type synonyms that mention type families</span></span>
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- on the RHS; see Note [Flattening synonyms]</span></span>
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="n" style="color: #333;">tc</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;">isFamFreeTyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">expanded_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">expanded_ty</span></span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise, it's a type function application, and we have to</span></span>
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flatten it away as well, and generate a new given equality constraint</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- between the application and a newly generated flattening skolem variable.</span></span>
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_one</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If it's a type family application, try to reduce it</span></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flatten_fam_app</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.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">@@ -123,7 +123,7 @@ module GHC.Tc.Solver.Monad (</td>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if the whole instance matcher simply belongs</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here</span></span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">breakTyVarCycle</span></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">breakTyVarCycle</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">flattenView</span></span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</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">@@ -146,6 +146,7 @@ import GHC.Tc.Instance.Class( InstanceWhat(..), safeOverlap, instanceReturnsDict</td>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Rep</span> <span class="c1" style="color: #998; font-style: italic;">-- this needs to be used only very locally</span></span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unify</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -392,8 +393,8 @@ data InertSet</td>
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<pre style="margin: 0;"> <span id="LC393" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Canonical Given, Wanted, Derived</span></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Sometimes called "the inert set"</span></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_<span class="idiff left">tv_cycles</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcTyVar</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">TcTyVar</span></span><span class="p">)]</span></span>
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<pre style="margin: 0;">-<span id="LC396" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a list of CycleBreakerTv / original <span class="idiff left right">tv pairs (in that order)</span></span></span>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_<span class="idiff left">cycle_breakers</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcTyVar</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">TcType</span></span><span class="p">)]</span></span>
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<pre style="margin: 0;">+<span id="LC397" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a list of CycleBreakerTv / original <span class="idiff left right">family applications</span></span></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- used to undo the cycle-breaking needed to handle</span></span>
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Type variable cycles in Givens] in GHC.Tc.Solver.Canonical</span></span>
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -434,10 +435,10 @@ emptyInertCans</td>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInert</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInert</span></span>
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<pre style="margin: 0;">-<span id="LC437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cans</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyInertCans</span></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_<span class="idiff left">tv_cycles</span></span><span class="idiff right"> </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="LC439" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_flat_cache</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFunEqs</span></span>
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<pre style="margin: 0;">-<span id="LC440" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_solved_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDictMap</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cans</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyInertCans</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_<span class="idiff left right">cycle_breakers</span></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="LC440" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_flat_cache</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFunEqs</span></span>
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<pre style="margin: 0;">+<span id="LC441" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_solved_dicts</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDictMap</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC443" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Solved dictionaries]</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">@@ -1397,7 +1398,7 @@ addTyEq old_eqs tv ct</td>
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"><span class="n" style="color: #333;">addCanFunEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"><span class="n" style="color: #333;">addCanFunEq</span> <span class="n" style="color: #333;">old_eqs</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC1400" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterTcApp</span> <span class="n" style="color: #333;">old_eqs</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">getUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fun_tc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">fun_args</span> <span class="n" style="color: #333;">upd</span></span>
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<pre style="margin: 0;">+<span id="LC1401" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterTcApp</span> <span class="n" style="color: #333;">old_eqs</span> <span class="n" style="color: #333;"><span class="idiff left right">fun_tc</span></span> <span class="n" style="color: #333;">fun_args</span> <span class="n" style="color: #333;">upd</span></span>
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1401
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1402
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<pre style="margin: 0;"> <span id="LC1402" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1402
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1403
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<pre style="margin: 0;"> <span id="LC1403" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">old_equal_ct_list</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">addToEqualCtList</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">old_equal_ct_list</span></span>
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1403
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1404
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<pre style="margin: 0;"> <span id="LC1404" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="p">[</span><span class="n" style="color: #333;">ct</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">@@ -1419,14 +1420,10 @@ findTyEqs icans tv = lookupDVarEnv (inert_eqs icans) tv `orElse` []</td>
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1420
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<pre style="margin: 0;"> <span id="LC1420" class="line" lang="haskell"></span>
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1420
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"><span class="n" style="color: #333;">delEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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1421
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"><span class="n" style="color: #333;">delEq</span> <span class="n" style="color: #333;">ic</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1422
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ic</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyDVarEnv</span></span>
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1423
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">filter</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;">isThisOne</span><span class="p">))</span></span>
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1424
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<pre style="margin: 0;">-<span id="LC1424" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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1425
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ic</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterTcApp</span></span>
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1427" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">tf</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="haskell"> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">-<span id="LC1429" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1423" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC1424" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ic</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">modifyDVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">filter</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;">isThisOne</span><span class="p">))</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1425" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC1426" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ic</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">alterTcApp</span> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">ic</span><span class="p">)</span> <span class="n" style="color: #333;">tf</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">upd</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1427" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1431
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1428
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"> <span class="n" style="color: #333;">upd</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eq_ct_list</span><span class="p">)</span></span>
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1432
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1429
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<pre style="margin: 0;"> <span id="LC1429" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">filtered</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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">@@ -1508,11 +1505,11 @@ When adding an equality to the inerts:</td>
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1508
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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kickOutRewritable with Nominal, Given. See kickOutAfterUnification.</span></span>
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1509
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1506
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1510
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1511" class="line" lang="haskell"><span class="n" style="color: #333;">addInertCan</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Constraints *other than* equalities</span></span></span>
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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell"><span class="n" style="color: #333;">addInertCan</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1512
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: item /is/ canonical</span></span>
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1513
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Adding an equality to the InertCans]</span></span>
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"><span class="n" style="color: #333;">addInertCan</span> <span class="n" style="color: #333;">ct</span></span>
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1515
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<pre style="margin: 0;">-<span id="LC1515" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"<span class="idiff left right">insert</span>InertCan {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"<span class="idiff left right">add</span>InertCan {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Trying to insert new inert item:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC1514" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1515" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</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">@@ -1702,7 +1699,7 @@ kick_out_rewritable new_fr new_lhs</td>
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1702
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1699
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<pre style="margin: 0;"> <span id="LC1699" class="line" lang="haskell"> <span class="n" style="color: #333;">extend_fun_eqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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1703
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<pre style="margin: 0;"> <span id="LC1700" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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1704
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<pre style="margin: 0;"> <span id="LC1701" class="line" lang="haskell"> <span class="n" style="color: #333;">extend_fun_eqs</span> <span class="n" style="color: #333;">eqs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span><span class="p">)</span> <span class="n" style="color: #333;">cts</span></span>
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1705
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<pre style="margin: 0;">-<span id="LC1705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">eqs</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">getUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_tc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;">+<span id="LC1702" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">eqs</span> <span class="n" style="color: #333;"><span class="idiff left right">fam_tc</span></span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">cts</span></span>
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1706
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1703
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<pre style="margin: 0;"> <span id="LC1703" class="line" lang="haskell"> <span class="n" style="color: #333;">extend_fun_eqs</span> <span class="n" style="color: #333;">eqs</span> <span class="n" style="color: #333;">other</span> <span class="n" style="color: #333;">_cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"extend_fun_eqs"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other</span><span class="p">)</span></span>
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1707
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1704
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<pre style="margin: 0;"> <span id="LC1704" class="line" lang="haskell"></span>
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1705
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<pre style="margin: 0;"> <span id="LC1705" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_eqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">container</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">container</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">@@ -2338,7 +2335,7 @@ not match the requested info exactly!</td>
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2335
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<pre style="margin: 0;"> <span id="LC2335" class="line" lang="haskell"></span>
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2339
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2336
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<pre style="margin: 0;"> <span id="LC2336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2340
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2337
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<pre style="margin: 0;"> <span id="LC2337" class="line" lang="haskell"></span>
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2341
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<pre style="margin: 0;">-<span id="LC2341" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDFM</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Unique</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListMap</span> <span class="kt" style="color: #458; font-weight: 600;">LooseTypeMap</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2338" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqDFM</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TyCon</span></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListMap</span> <span class="kt" style="color: #458; font-weight: 600;">LooseTypeMap</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2339" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Indexed by tycon then the arg types, using "loose" matching, where</span></span>
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<pre style="margin: 0;"> <span id="LC2340" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't require kind equality. This allows, for example, (a |> co)</span></span>
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<pre style="margin: 0;"> <span id="LC2341" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to match (a).</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">@@ -2352,27 +2349,24 @@ isEmptyTcAppMap m = isNullUDFM m</td>
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<pre style="margin: 0;"> <span id="LC2349" class="line" lang="haskell"><span class="n" style="color: #333;">emptyTcAppMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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2353
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<pre style="margin: 0;"> <span id="LC2350" class="line" lang="haskell"><span class="n" style="color: #333;">emptyTcAppMap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyUDFM</span></span>
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2351
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<pre style="margin: 0;"> <span id="LC2351" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2355" class="line" lang="haskell"><span class="n" style="color: #333;">findTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Unique</span></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;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC2356" class="line" lang="haskell"><span class="n" style="color: #333;">findTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">u</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys_map</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lookupUDFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">u</span></span></span>
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<pre style="margin: 0;">-<span id="LC2357" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lookupTM</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">tys_map</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2352" class="line" lang="haskell"><span class="n" style="color: #333;">findTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TyCon</span></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;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2353" class="line" lang="haskell"><span class="n" style="color: #333;">findTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys_map</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">lookupUDFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span></span></span>
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<pre style="margin: 0;">+<span id="LC2354" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">lookupTM</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">tys_map</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2355" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2359" class="line" lang="haskell"><span class="n" style="color: #333;">delTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Unique</span></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;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC2360" class="line" lang="haskell"><span class="n" style="color: #333;">delTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">cls</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">adjustUDFM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">deleteTM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cls</span></span></span>
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<pre style="margin: 0;">+<span id="LC2356" class="line" lang="haskell"><span class="n" style="color: #333;">delTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TyCon</span></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;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2357" class="line" lang="haskell"><span class="n" style="color: #333;">delTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">adjustUDFM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">deleteTM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span></span></span>
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<pre style="margin: 0;"> <span id="LC2358" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2362" class="line" lang="haskell"><span class="n" style="color: #333;">insertTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Unique</span></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="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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2363
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<pre style="margin: 0;">-<span id="LC2363" class="line" lang="haskell"><span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">cls</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alterUDFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alter_tm</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cls</span></span></span>
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<pre style="margin: 0;">+<span id="LC2359" class="line" lang="haskell"><span class="n" style="color: #333;">insertTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TyCon</span></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="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2360" class="line" lang="haskell"><span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ct</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alterUDFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alter_tm</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span></span></span>
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2364
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<pre style="margin: 0;"> <span id="LC2361" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2362" class="line" lang="haskell"> <span class="n" style="color: #333;">alter_tm</span> <span class="n" style="color: #333;">mb_tm</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">insertTM</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">ct</span> <span class="p">(</span><span class="n" style="color: #333;">mb_tm</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="n" style="color: #333;">emptyTM</span><span class="p">))</span></span>
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2363
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<pre style="margin: 0;"> <span id="LC2363" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2367" class="line" lang="haskell"><span class="n" style="color: #333;">alterTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Unique</span></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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC2368" class="line" lang="haskell"><span class="n" style="color: #333;">alterTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">cls</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">upd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alterUDFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alter_tm</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">cls</span></span></span>
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<pre style="margin: 0;">+<span id="LC2364" class="line" lang="haskell"><span class="n" style="color: #333;">alterTcApp</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TyCon</span></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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC2365" class="line" lang="haskell"><span class="n" style="color: #333;">alterTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left">tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">upd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alterUDFM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">alter_tm</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span></span></span>
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2369
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2366
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<pre style="margin: 0;"> <span id="LC2366" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2370
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2367
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<pre style="margin: 0;"> <span id="LC2367" class="line" lang="haskell"> <span class="n" style="color: #333;">alter_tm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListMap</span> <span class="kt" style="color: #458; font-weight: 600;">LooseTypeMap</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListMap</span> <span class="kt" style="color: #458; font-weight: 600;">LooseTypeMap</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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2371
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<pre style="margin: 0;"> <span id="LC2368" class="line" lang="haskell"> <span class="n" style="color: #333;">alter_tm</span> <span class="n" style="color: #333;">m_elt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">alterTM</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">upd</span> <span class="p">(</span><span class="n" style="color: #333;">m_elt</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="n" style="color: #333;">emptyTM</span><span class="p">))</span></span>
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2372
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<pre style="margin: 0;"> <span id="LC2369" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2373" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mapTcApp :: (a->b) -> TcAppMap a -> TcAppMap b</span></span>
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<pre style="margin: 0;">-<span id="LC2374" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mapTcApp f = mapUDFM (mapTM f)</span></span>
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<pre style="margin: 0;">-<span id="LC2375" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2370" class="line" lang="haskell"><span class="n" style="color: #333;">filterTcAppMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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<pre style="margin: 0;"> <span id="LC2371" class="line" lang="haskell"><span class="n" style="color: #333;">filterTcAppMap</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC2372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapUDFM</span> <span class="n" style="color: #333;">do_tm</span> <span class="n" style="color: #333;">m</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">@@ -2457,7 +2451,7 @@ findDict m loc cls tys</td>
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<pre style="margin: 0;"> <span id="LC2451" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Solving CallStack constraints]</span></span>
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2458
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2452
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<pre style="margin: 0;"> <span id="LC2452" class="line" lang="haskell"></span>
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2453
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<pre style="margin: 0;"> <span id="LC2453" 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="LC2460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">getUnique</span></span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">classTyCon</span></span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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2455
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<pre style="margin: 0;"> <span id="LC2455" class="line" lang="haskell"></span>
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2462
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<pre style="margin: 0;"> <span id="LC2456" class="line" lang="haskell"><span class="n" style="color: #333;">findDictsByClass</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="n" style="color: #333;">a</span></span>
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2457
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<pre style="margin: 0;"> <span id="LC2457" class="line" lang="haskell"><span class="n" style="color: #333;">findDictsByClass</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">cls</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">@@ -2465,10 +2459,10 @@ findDictsByClass m cls</td>
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2465
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<pre style="margin: 0;"> <span id="LC2459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyBag</span></span>
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2460
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<pre style="margin: 0;"> <span id="LC2460" class="line" lang="haskell"></span>
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2467
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2461
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<pre style="margin: 0;"> <span id="LC2461" class="line" lang="haskell"><span class="n" style="color: #333;">delDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</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;">DictMap</span> <span class="n" style="color: #333;">a</span></span>
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2468
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<pre style="margin: 0;">-<span id="LC2468" class="line" lang="haskell"><span class="n" style="color: #333;">delDict</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">getUnique</span></span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC2462" class="line" lang="haskell"><span class="n" style="color: #333;">delDict</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">classTyCon</span></span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC2463" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2464" class="line" lang="haskell"><span class="n" style="color: #333;">addDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</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="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="n" style="color: #333;">a</span></span>
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2471
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<pre style="margin: 0;">-<span id="LC2471" class="line" lang="haskell"><span class="n" style="color: #333;">addDict</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">getUnique</span></span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;">+<span id="LC2465" class="line" lang="haskell"><span class="n" style="color: #333;">addDict</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">classTyCon</span></span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;"> <span id="LC2466" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2467" class="line" lang="haskell"><span class="n" style="color: #333;">addDictsByClass</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span></span>
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<pre style="margin: 0;"> <span id="LC2468" class="line" lang="haskell"><span class="n" style="color: #333;">addDictsByClass</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">items</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">@@ -2511,7 +2505,7 @@ emptyFunEqs :: TcAppMap a</td>
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell"><span class="n" style="color: #333;">emptyFunEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyTcAppMap</span></span>
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2506
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"></span>
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2513
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2507
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<pre style="margin: 0;"> <span id="LC2507" class="line" lang="haskell"><span class="n" style="color: #333;">findFunEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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2514
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<pre style="margin: 0;">-<span id="LC2514" class="line" lang="haskell"><span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">getUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">tys</span></span>
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2508
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<pre style="margin: 0;">+<span id="LC2508" class="line" lang="haskell"><span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left right">tc</span></span> <span class="n" style="color: #333;">tys</span></span>
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2515
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2509
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<pre style="margin: 0;"> <span id="LC2509" class="line" lang="haskell"></span>
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2516
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2510
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<pre style="margin: 0;"> <span id="LC2510" class="line" lang="haskell"><span class="n" style="color: #333;">findFunEqsByTyCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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>
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2517
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2511
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<pre style="margin: 0;"> <span id="LC2511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Get inert function equation constraints that have the given tycon</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2519" 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="2513" 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">@@ -2519,8 +2513,8 @@ findFunEqsByTyCon :: FunEqMap a -> TyCon -> [a]</td>
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2519
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2513
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<pre style="margin: 0;"> <span id="LC2513" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We use this to check for derived interactions with built-in type-function</span></span>
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2520
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2514
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<pre style="margin: 0;"> <span id="LC2514" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constructors.</span></span>
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2521
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2515
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<pre style="margin: 0;"> <span id="LC2515" class="line" lang="haskell"><span class="n" style="color: #333;">findFunEqsByTyCon</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span></span>
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2522
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupUDFM</span> <span class="n" style="color: #333;">m</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">getUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTM</span> <span class="p">(</span><span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="n" style="color: #333;">tm</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2523
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2516
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<pre style="margin: 0;">+<span id="LC2516" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tm</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupUDFM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left right">tc</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTM</span> <span class="p">(</span><span class="o" style="font-weight: 600;">:</span><span class="p">)</span> <span class="n" style="color: #333;">tm</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2517
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<pre style="margin: 0;">+<span id="LC2517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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2524
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2518
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="haskell"></span>
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2525
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2519
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"><span class="n" style="color: #333;">foldFunEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></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;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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2526
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2520
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"><span class="n" style="color: #333;">foldFunEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTcAppMap</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2535" 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="2529" 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">@@ -2535,7 +2529,7 @@ anyFunEqMap m test = foldFunEqs (\ a b -> b || test a) m False</td>
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2535
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2529
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<pre style="margin: 0;"> <span id="LC2529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- filterFunEqs = filterTcAppMap</span></span>
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2536
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2530
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<pre style="margin: 0;"> <span id="LC2530" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2531" class="line" lang="haskell"><span class="n" style="color: #333;">insertFunEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</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="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC2538" class="line" lang="haskell"><span class="n" style="color: #333;">insertFunEq</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">val</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">getUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">val</span></span>
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"><span class="n" style="color: #333;">insertFunEq</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">val</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;"><span class="idiff left right">tc</span></span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">val</span></span>
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<pre style="margin: 0;"> <span id="LC2533" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2534" 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="LC2535" 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">@@ -3435,24 +3429,61 @@ See GHC.Tc.Solver.Monad.deferTcSForAllEq</td>
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<pre style="margin: 0;"> <span id="LC3429" 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="LC3430" 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="LC3431" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3438" class="line" lang="haskell"><span class="cd">-- | Replace all <span class="idiff left right">occurrences of the LHS tyvar in an RHS with a fresh</span></span></span>
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<pre style="margin: 0;">-<span id="LC3439" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">variable, recording the pairing in the TcS monad</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC3432" class="line" lang="haskell"><span class="cd">-- | Replace all <span class="idiff left right">type family applications in the RHS with fresh variables,</span></span></span>
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<pre style="margin: 0;">+<span id="LC3433" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">emitting givens that relate the type family application to the variable</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC3434" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Type variable cycles in Givens] in GHC.Tc.Solver.Canonical.</span></span>
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<pre style="margin: 0;">-<span id="LC3441" class="line" lang="haskell"><span class="n" style="color: #333;">breakTyVarCycle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TyVar</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- the LHS tyvar</span></span></span>
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<pre style="margin: 0;">+<span id="LC3435" class="line" lang="haskell"><span class="n" style="color: #333;">breakTyVarCycle</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtLoc</span></span></span>
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<pre style="margin: 0;"> <span id="LC3436" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- the RHS</span></span>
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<pre style="margin: 0;">-<span id="LC3443" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- new RHS that doesn't mention TyVar</span></span>
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<pre style="margin: 0;">-<span id="LC3444" class="line" lang="haskell"><span class="n" style="color: #333;">breakTyVarCycle</span> <span class="n" style="color: #333;">lhs_tv</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">-<span id="LC3445" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrapTcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newCycleBreakerTyVar</span> <span class="n" style="color: #333;">lhs_tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3446" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updInertTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">is</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC3447" class="line" lang="haskell"> <span class="n" style="color: #333;">is</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_tv_cycles</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">new_tv</span><span class="p">,</span> <span class="n" style="color: #333;">lhs_tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">inert_tv_cycles</span> <span class="n" style="color: #333;">is</span> <span class="p">}</span></span>
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3448
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<pre style="margin: 0;">-<span id="LC3448" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">in_scope</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;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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3449
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<pre style="margin: 0;">-<span id="LC3449" class="line" lang="haskell"> <span class="n" style="color: #333;">subst0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span></span>
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3450
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<pre style="margin: 0;">-<span id="LC3450" class="line" lang="haskell"> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTvSubstWithClone</span> <span class="n" style="color: #333;">subst0</span> <span class="n" style="color: #333;">lhs_tv</span> <span class="n" style="color: #333;">new_tv</span></span>
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3451
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<pre style="margin: 0;">-<span id="LC3451" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="p">}</span></span>
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3437
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<pre style="margin: 0;">+<span id="LC3437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- new RHS that doesn't have any type families</span></span>
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<pre style="margin: 0;">+<span id="LC3438" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This could be considerably more efficient. See Detail (5) of Note.</span></span>
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3439
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<pre style="margin: 0;">+<span id="LC3439" class="line" lang="haskell"><span class="n" style="color: #333;">breakTyVarCycle</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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3440
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<pre style="margin: 0;">+<span id="LC3440" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3441
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<pre style="margin: 0;">+<span id="LC3441" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty'</span></span>
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3442
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<pre style="margin: 0;">+<span id="LC3442" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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3443
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<pre style="margin: 0;">+<span id="LC3443" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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3444
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<pre style="margin: 0;">+<span id="LC3444" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">fun_args</span><span class="p">,</span> <span class="n" style="color: #333;">extra_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAt</span> <span class="p">(</span><span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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3445
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<pre style="margin: 0;">+<span id="LC3445" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_app</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">fun_args</span></span>
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3446
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<pre style="margin: 0;">+<span id="LC3446" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_app_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">fun_app</span></span>
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3447
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<pre style="margin: 0;">+<span id="LC3447" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrapTcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newCycleBreakerTyVar</span> <span class="n" style="color: #333;">fun_app_kind</span><span class="p">)</span></span>
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3448
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<pre style="margin: 0;">+<span id="LC3448" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">new_tv</span></span>
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3449
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<pre style="margin: 0;">+<span id="LC3449" class="line" lang="haskell"> <span class="n" style="color: #333;">given_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkHeteroPrimEqPred</span> <span class="n" style="color: #333;">fun_app_kind</span> <span class="n" style="color: #333;">fun_app_kind</span></span>
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<pre style="margin: 0;">+<span id="LC3450" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_app</span> <span class="n" style="color: #333;">new_ty</span></span>
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3451
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<pre style="margin: 0;">+<span id="LC3451" class="line" lang="haskell"> <span class="n" style="color: #333;">given_term</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">evCoercion</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkNomReflCo</span> <span class="n" style="color: #333;">new_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (4) of Note</span></span>
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3452
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<pre style="margin: 0;">+<span id="LC3452" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_given</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newGivenEvVar</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">given_pred</span><span class="p">,</span> <span class="n" style="color: #333;">given_term</span><span class="p">)</span></span>
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3453
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<pre style="margin: 0;">+<span id="LC3453" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"breakTyVarCycle replacing type family"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_given</span><span class="p">)</span></span>
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3454
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<pre style="margin: 0;">+<span id="LC3454" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWorkNC</span> <span class="p">[</span><span class="n" style="color: #333;">new_given</span><span class="p">]</span></span>
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3455
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<pre style="margin: 0;">+<span id="LC3455" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updInertTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">is</span> <span class="o" style="font-weight: 600;">-></span></span>
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3456
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<pre style="margin: 0;">+<span id="LC3456" class="line" lang="haskell"> <span class="n" style="color: #333;">is</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cycle_breakers</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">new_tv</span><span class="p">,</span> <span class="n" style="color: #333;">fun_app</span><span class="p">)</span> <span class="o" style="font-weight: 600;">:</span></span>
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3457
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<pre style="margin: 0;">+<span id="LC3457" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_cycle_breakers</span> <span class="n" style="color: #333;">is</span> <span class="p">}</span></span>
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3458
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<pre style="margin: 0;">+<span id="LC3458" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">extra_args'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">extra_args</span></span>
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3459
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<pre style="margin: 0;">+<span id="LC3459" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkAppTys</span> <span class="n" style="color: #333;">new_ty</span> <span class="n" style="color: #333;">extra_args'</span><span class="p">)</span> <span class="p">}</span></span>
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3460
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<pre style="margin: 0;">+<span id="LC3460" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Worried that this substitution will change kinds?</span></span>
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3461
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<pre style="margin: 0;">+<span id="LC3461" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (3) of Note</span></span>
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3462
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<pre style="margin: 0;">+<span id="LC3462" class="line" lang="haskell"></span>
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3463
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<pre style="margin: 0;">+<span id="LC3463" 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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3464
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<pre style="margin: 0;">+<span id="LC3464" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tys</span></span>
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3465
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<pre style="margin: 0;">+<span id="LC3465" class="line" lang="haskell"></span>
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3466
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<pre style="margin: 0;">+<span id="LC3466" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkAppTy</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty2</span></span>
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3467
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<pre style="margin: 0;">+<span id="LC3467" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="n" style="color: #333;">vis</span> <span class="n" style="color: #333;">w</span> <span class="n" style="color: #333;">arg</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFunTy</span> <span class="n" style="color: #333;">vis</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">res</span></span>
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3468
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<pre style="margin: 0;">+<span id="LC3468" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCastTy</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><*></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">co</span></span>
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3469
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<pre style="margin: 0;">+<span id="LC3469" class="line" lang="haskell"></span>
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3470
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<pre style="margin: 0;">+<span id="LC3470" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span></span>
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3471
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<pre style="margin: 0;">+<span id="LC3471" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span></span>
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3472
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<pre style="margin: 0;">+<span id="LC3472" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (1) of Note</span></span>
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3473
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<pre style="margin: 0;">+<span id="LC3473" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (2) of Note</span></span>
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3452
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3474
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<pre style="margin: 0;"> <span id="LC3474" class="line" lang="haskell"></span>
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3453
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3475
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<pre style="margin: 0;"> <span id="LC3475" class="line" lang="haskell"><span class="cd">-- | Filli in CycleBreakerTvs with the variables they stand for.</span></span>
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3454
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3476
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<pre style="margin: 0;"> <span id="LC3476" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Type variable cycles in Givens] in GHC.Tc.Solver.Canonical.</span></span>
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3455
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3477
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<pre style="margin: 0;"> <span id="LC3477" class="line" lang="haskell"><span class="n" style="color: #333;">restoreTyVarCycles</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3456
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3478
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<pre style="margin: 0;"> <span id="LC3478" class="line" lang="haskell"><span class="n" style="color: #333;">restoreTyVarCycles</span> <span class="n" style="color: #333;">is</span></span>
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3457
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<pre style="margin: 0;">-<span id="LC3457" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forM_</span> <span class="p">(</span><span class="n" style="color: #333;">inert_tv_cycles</span> <span class="n" style="color: #333;">is</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">(</span><span class="n" style="color: #333;">cycle_breaker_tv</span><span class="p">,</span> <span class="n" style="color: #333;">orig_tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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3458
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<pre style="margin: 0;">-<span id="LC3458" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">cycle_breaker_tv</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">orig_tv</span><span class="p">)</span></span></pre>
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<pre style="margin: 0;">+<span id="LC3479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forM_</span> <span class="p">(</span><span class="n" style="color: #333;">inert_cycle_breakers</span> <span class="n" style="color: #333;">is</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">(</span><span class="n" style="color: #333;">cycle_breaker_tv</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC3480" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">cycle_breaker_tv</span> <span class="n" style="color: #333;">orig_ty</span></span>
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3481
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<pre style="margin: 0;">+<span id="LC3481" class="line" lang="haskell"></span>
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3482
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<pre style="margin: 0;">+<span id="LC3482" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unwrap a type synonym only when either:</span></span>
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3483
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<pre style="margin: 0;">+<span id="LC3483" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The type synonym is forgetful, or</span></span>
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3484
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<pre style="margin: 0;">+<span id="LC3484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the type synonym mentions a type family in its expansion</span></span>
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3485
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<pre style="margin: 0;">+<span id="LC3485" class="line" lang="haskell"><span class="n" style="color: #333;">flattenView</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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3486
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<pre style="margin: 0;">+<span id="LC3486" class="line" lang="haskell"><span class="n" style="color: #333;">flattenView</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3487" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeSynonymTyCon</span> <span class="n" style="color: #333;">tc</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;">isFamFreeTyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC3488" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC3489" class="line" lang="haskell"><span class="n" style="color: #333;">flattenView</span> <span class="n" style="color: #333;">_other</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -150,7 +150,7 @@ data Ct</td>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a ~ [a] occurs check</span></span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">tv</span> ~ rhs</span></span>
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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">CanEqLHS</span> ~ rhs</span></span>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Invariants:</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * See Note [inert_eqs: the inert equalities] in GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Many are checked in checkTypeEq in GHC.Tc.Utils.Unify</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.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">@@ -871,11 +871,11 @@ cloneAnonMetaTyVar info tv kind</td>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Make a new CycleBreakerTv. See Note [Type variable cycles in Givens]</span></span>
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<pre style="margin: 0;"> <span id="LC873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver.Canonical.</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">newCycleBreakerTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T<span class="idiff left right">yVar</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="n" style="color: #333;">newCycleBreakerTyVar</span> <span class="n" style="color: #333;"><span class="idiff left right">old_tv</span></span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">newCycleBreakerTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T<span class="idiff left right">cKind</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="n" style="color: #333;">newCycleBreakerTyVar</span> <span class="n" style="color: #333;"><span class="idiff left right">kind</span></span></span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaDetails</span> <span class="kt" style="color: #458; font-weight: 600;">CycleBreakerTv</span></span>
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">cloneMetaTyVarName</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tyVarName</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">old_tv</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">name</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">tyVarKind</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_tv</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">details</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left">newMetaTyVarName</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">fsLit</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"cbv"</span></span><span class="p">)</span></span>
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878
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;"><span class="idiff left right">kind</span></span> <span class="n" style="color: #333;">details</span><span class="p">)</span> <span class="p">}</span></span>
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"></span>
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880
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<pre style="margin: 0;"> <span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaDetails</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MetaInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarDetails</span></span>
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881
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881
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaDetails</span> <span class="n" style="color: #333;">info</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#344f534534e1418b7146783c94eecdf3d1d4ea71"><strong>testsuite/tests/indexed-types/should_fail/Simple13.hs</strong>
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<strong>testsuite/tests/indexed-types/should_compile/Simple13.hs</strong>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e"><strong>testsuite/tests/indexed-types/should_compile/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="10" 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="10" 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">@@ -10,6 +10,7 @@ test('Simple9', normal, compile, [''])</td>
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple10</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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11
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11
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple11</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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12
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12
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple12</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple13</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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13
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14
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple14</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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14
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15
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple15</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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15
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple16</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="297" 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="298" 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">@@ -297,3 +298,4 @@ test('T17923', normal, compile, [''])</td>
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297
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298
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18065</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span>
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298
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299
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CEqCanOccursCheck</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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299
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300
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">GivenLoop</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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301
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18875</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#3e0457789f3266c805563b6a84cef1dfb08aed7e"><strong>testsuite/tests/indexed-types/should_fail/all.T</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">@@ -163,4 +163,3 @@ test('T17008a', normal, compile_fail, ['-fprint-explicit-kinds'])</td>
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163
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13571</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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164
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164
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13571a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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165
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18648</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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166
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">Simple13</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/cdc73a4c3e789c7725e594b7582896301d77f8c7...3cf175e03363960bc603572eaaffbf13c559f0c5#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="584" 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="584" 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">@@ -584,3 +584,4 @@ test('too-many', normal, compile_fail, [''])</td>
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584
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584
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18640a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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585
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585
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18640b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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586
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586
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18640c</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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587
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<pre style="margin: 0;">+<span id="LC587" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">GivenForallLoop</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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