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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293">edec6a6c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-06T04:41:57-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make isTauTy detect higher-rank contexts
Previously, `isTauTy` would only detect higher-rank `forall`s, not
higher-rank contexts, which led to some minor bugs observed
in #18127. Easily fixed by adding a case for
`(FunTy InvisArg _ _)`.
Fixes #18127.
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<h4>7 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="#0011e9fe4e6ece6642f125a2ddc3c2c43934507e">
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+
testsuite/tests/deriving/should_fail/T18127b.hs
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<li class="file-stats">
<a href="#61a57623f7661c17448eb93d1b1e7e8d3ada4c09">
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testsuite/tests/deriving/should_fail/T18127b.stderr
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<li class="file-stats">
<a href="#fe704eff5994395af741e90abe1df7aa42891d86">
testsuite/tests/deriving/should_fail/all.T
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<li class="file-stats">
<a href="#abbdf3af99f6dc2833b7499a6bcea06b1802aa31">
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testsuite/tests/typecheck/should_fail/T18127a.hs
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<li class="file-stats">
<a href="#fcc6f00ad2164fefb0f1d0b3cdcce7152de7c8ca">
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testsuite/tests/typecheck/should_fail/T18127a.stderr
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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/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#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">@@ -1857,17 +1857,19 @@ fun_kind_arg_flags = go emptyTCvSubst</td>
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1857
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1857
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<pre style="margin: 0;"> <span id="LC1857" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- something is ill-kinded. But this can happen</span></span>
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1858
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1858
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<pre style="margin: 0;"> <span id="LC1858" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- when printing errors. Assume everything is Required.</span></span>
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1859
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1859
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<pre style="margin: 0;"> <span id="LC1859" class="line" lang="haskell"></span>
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1860
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<pre style="margin: 0;">-<span id="LC1860" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @isTauTy@ tests if a type has no foralls</span></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @isTauTy@ tests if a type has no foralls<span class="idiff left right"> or (=>)</span></span></span>
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1861
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1861
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<pre style="margin: 0;"> <span id="LC1861" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1862
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1862
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<pre style="margin: 0;"> <span id="LC1862" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</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;">coreView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">ty'</span></span>
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1863
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<pre style="margin: 0;">-<span id="LC1863" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1864
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<pre style="margin: 0;">-<span id="LC1864" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">True</span></span>
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1865
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<pre style="margin: 0;">-<span id="LC1865" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTauTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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1866
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<pre style="margin: 0;">-<span id="LC1866" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">b</span></span>
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1867
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<pre style="margin: 0;">-<span id="LC1867" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">b</span></span>
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1868
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<pre style="margin: 0;">-<span id="LC1868" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">False</span></span>
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1869
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<pre style="margin: 0;">-<span id="LC1869" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">ty</span></span>
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1870
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<pre style="margin: 0;">-<span id="LC1870" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Not sure about this</span></span>
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<pre style="margin: 0;">+<span id="LC1863" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1864
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<pre style="margin: 0;">+<span id="LC1864" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">True</span></span>
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1865
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<pre style="margin: 0;">+<span id="LC1865" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</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 class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTauTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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1866
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<pre style="margin: 0;">+<span id="LC1866" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">b</span></span>
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1867
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<pre style="margin: 0;">+<span id="LC1867" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="n" style="color: #333;">af</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">af</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1868
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">InvisArg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- e.g., Eq a => b</span></span>
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1869
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<pre style="margin: 0;">+<span id="LC1869" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">VisArg</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">b</span> <span class="c1" style="color: #998; font-style: italic;">-- e.g., a -> b</span></span>
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1870
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<pre style="margin: 0;">+<span id="LC1870" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</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="kt" style="color: #458; font-weight: 600;">False</span></span>
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1871
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<pre style="margin: 0;">+<span id="LC1871" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">ty</span></span>
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1872
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<pre style="margin: 0;">+<span id="LC1872" class="line" lang="haskell"><span class="n" style="color: #333;">isTauTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Not sure about this</span></span>
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1871
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1873
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<pre style="margin: 0;"> <span id="LC1873" class="line" lang="haskell"></span>
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1872
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1874
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<pre style="margin: 0;"> <span id="LC1874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1873
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1875
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<pre style="margin: 0;"> <span id="LC1875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#0011e9fe4e6ece6642f125a2ddc3c2c43934507e"><strong>testsuite/tests/deriving/should_fail/T18127b.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveGeneric #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18127b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Generics</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T1</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT1</span> <span class="p">(</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="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T2</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;">MkT2</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#61a57623f7661c17448eb93d1b1e7e8d3ada4c09"><strong>testsuite/tests/deriving/should_fail/T18127b.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">T18127b.hs:7:40: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Can't make a derived instance of ‘Eq T1’:</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Constructor ‘MkT1’ has a higher-rank type</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Possible fix: use a standalone deriving declaration instead</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the data declaration for ‘T1’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">T18127b.hs:7:44: error:</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • Can't make a derived instance of ‘Generic T1’:</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> MkT1 must not have exotic unlifted or polymorphic arguments</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> • In the data declaration for ‘T1’</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">T18127b.hs:8:42: error:</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> • Can't make a derived instance of ‘Eq (T2 a)’:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Constructor ‘MkT2’ has a higher-rank type</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> Possible fix: use a standalone deriving declaration instead</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> • In the data declaration for ‘T2’</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext">T18127b.hs:8:46: error:</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> • Can't make a derived instance of ‘Generic (T2 a)’:</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> MkT2 must not have exotic unlifted or polymorphic arguments</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> • In the data declaration for ‘T2’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#fe704eff5994395af741e90abe1df7aa42891d86"><strong>testsuite/tests/deriving/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">@@ -76,6 +76,7 @@ test('T15073', [extra_files(['T15073a.hs'])], multimod_compile_fail,</td>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">T15073</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16181</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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78
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78
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16923</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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79
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18127b</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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79
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80
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">deriving-via-fail</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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80
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81
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">deriving-via-fail2</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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81
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82
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">deriving-via-fail3</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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<li id="abbdf3af99f6dc2833b7499a6bcea06b1802aa31">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#abbdf3af99f6dc2833b7499a6bcea06b1802aa31"><strong>testsuite/tests/typecheck/should_fail/T18127a.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18127a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">C</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="n" style="color: #333;">a</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">D</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;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span></pre>
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<li id="fcc6f00ad2164fefb0f1d0b3cdcce7152de7c8ca">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#fcc6f00ad2164fefb0f1d0b3cdcce7152de7c8ca"><strong>testsuite/tests/typecheck/should_fail/T18127a.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">T18127a.hs:5:5: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘a1’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> with a type involving polytypes: (forall a. a) -> ()</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the expression: undefined</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In an equation for ‘a’: a = undefined</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">T18127a.hs:8:5: error:</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘a3’</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> with a type involving polytypes: (Show a => a) -> ()</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> • In the expression: undefined</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> In an equation for ‘b’: b = undefined</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> b :: (Show a => a) -> () (bound at T18127a.hs:8:1)</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">T18127a.hs:12:5: error:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘a0’</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> with a type involving polytypes: C -> ()</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> • In the expression: undefined</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> In an equation for ‘c’: c = undefined</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">T18127a.hs:16:5: error:</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘a2’</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> with a type involving polytypes: D a -> ()</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> • In the expression: undefined</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> In an equation for ‘d’: d = undefined</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> d :: D a -> () (bound at T18127a.hs:16:1)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/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">@@ -563,3 +563,4 @@ test('T17021', normal, compile_fail, [''])</td>
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563
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17021b</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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<pre style="margin: 0;"> <span id="LC564" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17955</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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565
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17173</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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566
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18127a</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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