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<h3>
Simon Peyton Jones pushed to branch wip/T17656
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/061eee913a913b934845549ba90a4e8381454b1d">061eee91</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-11-26T23:44:19+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles
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<h4>5 changed files:</h4>
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#be3176dd680b038f442161581e992924140d0404">
testsuite/tests/ghci.debugger/scripts/break012.stdout
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<a href="#d9b84a6a85857ca6c1c54a44783355ad60647fa0">
testsuite/tests/partial-sigs/should_fail/ScopedNamedWildcardsBad.stderr
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<a href="#d67673f1f07a2cd7b42addb9d5e4bdb29f7a7002">
testsuite/tests/typecheck/should_fail/ExpandSynsFail2.stderr
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<li class="file-stats">
<a href="#1ebf0c75765ea8946e5ea0a914d6d48df2f66b33">
testsuite/tests/typecheck/should_fail/T7453.stderr
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<h4>Changes:</h4>
<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/061eee913a913b934845549ba90a4e8381454b1d#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2269" 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">@@ -2269,7 +2269,7 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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<pre style="margin: 0;"> <span id="LC2269" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2270" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function handles the case where one side is a tyvar and the other is</span></span>
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<pre style="margin: 0;"> <span id="LC2271" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a type family application. Which to put on the left?</span></span>
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<pre style="margin: 0;">-<span id="LC2272" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If <span class="idiff left right">we can unify the variable</span>, put it on the left, as this may be our only</span></span>
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<pre style="margin: 0;">+<span id="LC2272" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If <span class="idiff left right">the tyvar is a meta-tyvar</span>, put it on the left, as this may be our only</span></span>
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<pre style="margin: 0;"> <span id="LC2273" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- shot to unify.</span></span>
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<pre style="margin: 0;"> <span id="LC2274" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Otherwise, put the function on the left, because it's generally better to</span></span>
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<pre style="margin: 0;"> <span id="LC2275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rewrite away function calls. This makes types smaller. And it seems necessary:</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2288" 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="2288" 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">@@ -2288,17 +2288,16 @@ canEqTyVarFunEq :: CtEvidence -- :: lhs ~ (rhs |> mco)</td>
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<pre style="margin: 0;"> <span id="LC2288" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="c1" style="color: #998; font-style: italic;">-- :: kind(rhs) ~N kind(lhs)</span></span>
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<pre style="margin: 0;"> <span id="LC2289" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2290" class="line" lang="haskell"><span class="n" style="color: #333;">canEqTyVarFunEq</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ps_xi1</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span> <span class="n" style="color: #333;">ps_xi2</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">-<span id="LC2291" 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;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;">-<span id="LC2292" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">-<span id="LC2293" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv1</span></span>
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<pre style="margin: 0;">-<span id="LC2294" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkTyVarEq</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span> <span class="n" style="color: #333;">tv1</span> <span class="p">(</span><span class="n" style="color: #333;">ps_xi2</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">mco</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2295" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">canEqCanLHSFinish</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2296" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ps_xi2</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">mco</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2291" 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="c1" style="color: #998; font-style: italic;">-- tclvl <- getTcLevel</span></span>
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2292
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<pre style="margin: 0;">+<span id="LC2292" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- dflags <- getDynFlags</span></span>
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2293
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<pre style="margin: 0;">+<span id="LC2293" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv1</span></span>
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2294
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<pre style="margin: 0;">+<span id="LC2294" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">canEqCanLHSFinish</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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2295
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<pre style="margin: 0;">+<span id="LC2295" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ps_xi2</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">mco</span><span class="p">)</span></span>
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2297
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2296
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<pre style="margin: 0;"> <span id="LC2296" 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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2298
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<pre style="margin: 0;">-<span id="LC2298" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteCastedEquality</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span></span>
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2297
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<pre style="margin: 0;">+<span id="LC2297" 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_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteCastedEquality</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span></span>
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2299
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2298
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<pre style="margin: 0;"> <span id="LC2298" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span><span class="p">)</span></span>
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2299
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<pre style="margin: 0;"> <span id="LC2299" class="line" lang="haskell"> <span class="n" style="color: #333;">mco</span></span>
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2301
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<pre style="margin: 0;">-<span id="LC2301" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">canEqCanLHSFinish</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span></span>
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<pre style="margin: 0;">+<span id="LC2300" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">canEqCanLHSFinish</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span></span>
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<pre style="margin: 0;"> <span id="LC2301" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span><span class="p">)</span></span>
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2303
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2302
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<pre style="margin: 0;"> <span id="LC2302" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ps_xi1</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">sym_mco</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2303" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/061eee913a913b934845549ba90a4e8381454b1d#be3176dd680b038f442161581e992924140d0404"><strong>testsuite/tests/ghci.debugger/scripts/break012.stdout</strong></a>
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1
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">Stopped in Main.g, break012.hs:5:10-18</span>
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2
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">_result :: (<span class="idiff left right">p, a1 -> a1</span>, (), a -> a -> a) = _</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">a :: <span class="idiff left right">p</span> = _</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">b :: a<span class="idiff left right">2 -> a2</span> = _</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">_result :: (<span class="idiff left right">a1, a2 -> a2</span>, (), a -> a -> a) = _</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">a :: <span class="idiff left right">a1</span> = _</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">b :: a<span class="idiff left right">3 -> a3</span> = _</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">c :: () = _</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">d :: a -> a -> a = _</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">a :: <span class="idiff left right">p</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">b :: a<span class="idiff left right">2 -> a2</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">a :: <span class="idiff left right">a1</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">b :: a<span class="idiff left right">3 -> a3</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">c :: ()</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">d :: a -> a -> a</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">a = (_t1::<span class="idiff left right">p</span>)</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">b = (_t2::a<span class="idiff left right">2 -> a2</span>)</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">a = (_t1::<span class="idiff left right">a1</span>)</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">b = (_t2::a<span class="idiff left right">3 -> a3</span>)</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">c = (_t3::())</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">d = (_t4::a -> a -> a)</span></pre>
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<li id="d9b84a6a85857ca6c1c54a44783355ad60647fa0">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/061eee913a913b934845549ba90a4e8381454b1d#d9b84a6a85857ca6c1c54a44783355ad60647fa0"><strong>testsuite/tests/partial-sigs/should_fail/ScopedNamedWildcardsBad.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">ScopedNamedWildcardsBad.hs:<span class="idiff left right">8:21</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">ScopedNamedWildcardsBad.hs:<span class="idiff left right">11:15</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘Bool’ with actual type ‘Char’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘not’, namely ‘x’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the expression: not x</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In an equation for ‘v’: v = not x</span></pre>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘g’, namely ‘'x'’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the expression: g 'x'</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the expression:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> let</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> v = not x</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> g :: _a -> _a</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> g x = x</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> in (g 'x')</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/061eee913a913b934845549ba90a4e8381454b1d#d67673f1f07a2cd7b42addb9d5e4bdb29f7a7002"><strong>testsuite/tests/typecheck/should_fail/ExpandSynsFail2.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">ExpandSynsFail2.hs:19:37: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">Int’ with ‘Bool</span>’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">Bool’ with ‘Int</span>’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Expected: ST s Foo</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Actual: MyBarST s</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Type synonyms expanded:</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/061eee913a913b934845549ba90a4e8381454b1d#1ebf0c75765ea8946e5ea0a914d6d48df2f66b33"><strong>testsuite/tests/typecheck/should_fail/T7453.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T7453.hs:10:30: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘t’ with actual type ‘p’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T7453.hs:9:15: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘t’ with ‘p’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: Id t</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Actual: Id p</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> ‘t’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> z :: forall t. Id t</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">@@ -8,17 +10,29 @@ T7453.hs:10:30: error:</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> ‘p’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> the inferred type of cast1 :: p -> a</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> at T7453.hs:(7,1)-(10,30)</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> • In the first argument of ‘Id’, namely ‘v’</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> In the expression: Id v</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> In an equation for ‘aux’: aux = Id v</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> • In the expression: aux</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> In an equation for ‘z’:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> aux = Id v</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> In an equation for ‘cast1’:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> cast1 v</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> = runId z</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> z :: Id t</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> aux = Id v</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> aux :: Id <span class="idiff left right">t</span> (bound at T7453.hs:10:21)</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> aux :: Id <span class="idiff left right">p</span> (bound at T7453.hs:10:21)</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"> z :: Id t (bound at T7453.hs:9:11)</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"> v :: p (bound at T7453.hs:7:7)</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> cast1 :: p -> a (bound at T7453.hs:7:1)</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">T7453.hs:16:33: error:</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> • Couldn't match expected type ‘t1’ with actual type ‘p’</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">T7453.hs:15:15: error:</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> • Couldn't match type ‘t1’ with ‘p’</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> Expected: () -> t1</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> Actual: () -> p</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext"> ‘t1’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> z :: forall t1. () -> t1</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">@@ -26,11 +40,21 @@ T7453.hs:16:33: error:</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> ‘p’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"> the inferred type of cast2 :: p -> t</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> at T7453.hs:(13,1)-(16,33)</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext"> • In the first argument of ‘const’, namely ‘v’</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> In the expression: const v</span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext"> In an equation for ‘aux’: aux = const v</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> • In the expression: aux</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> In an equation for ‘z’:</span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext"> aux = const v</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"> In an equation for ‘cast2’:</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"> cast2 v</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext"> = z ()</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"> z :: () -> t</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext"> aux = const v</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext"> aux :: <span class="idiff left right">b -> t1</span> (bound at T7453.hs:16:21)</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"> aux :: <span class="idiff left right">forall {b}. b -> p</span> (bound at T7453.hs:16:21)</span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"> z :: () -> t1 (bound at T7453.hs:15:11)</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"> v :: p (bound at T7453.hs:13:7)</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"> cast2 :: p -> t (bound at T7453.hs:13:1)</span>
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