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<h3>
Simon Peyton Jones pushed to branch wip/T18036
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386b5ad22ad8724204be13e29f1e5181574880fa">386b5ad2</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-04-09T16:51:46+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a buglet in redundant-constraint warnings
Ticket #18036 pointed out that we were reporting a redundant
constraint when it really really wasn't.
Turned out to be a buglet in the SkolemInfo for the
relevant implication constraint. Easily fixed!
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<h4>5 changed files:</h4>
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<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
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testsuite/tests/typecheck/should_compile/T18036.hs
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<a href="#c3804a76f71e7c9059b53e0855b541cf3a5fc140">
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testsuite/tests/typecheck/should_compile/T18036a.hs
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testsuite/tests/typecheck/should_compile/T18036a.stderr
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="e63425e031ffe9350ee6b1687e506aaea75d11e1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386b5ad22ad8724204be13e29f1e5181574880fa#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.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">@@ -1719,19 +1719,26 @@ tcMethodBodyHelp hs_sig_fn sel_id local_meth_id meth_bind</td>
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<pre style="margin: 0;"> <span id="LC1719" 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;">hs_sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">hs_sig_fn</span> <span class="n" style="color: #333;">sel_name</span></span>
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<pre style="margin: 0;"> <span id="LC1720" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There is a signature in the instance</span></span>
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<pre style="margin: 0;"> <span id="LC1721" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Instance method signatures]</span></span>
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<pre style="margin: 0;">-<span id="LC1722" 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="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="n" style="color: #333;">sel_name</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC1723" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">sig_ty</span><span class="p">,</span> <span class="n" style="color: #333;">hs_wrap</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1722" 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="p">(</span><span class="n" style="color: #333;">sig_ty</span><span class="p">,</span> <span class="n" style="color: #333;">hs_wrap</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1723" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">hs_sig_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="LC1724" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inst_sigs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">InstanceSigs</span></span>
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<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkTc</span> <span class="n" style="color: #333;">inst_sigs</span> <span class="p">(</span><span class="n" style="color: #333;">misplacedInstSig</span> <span class="n" style="color: #333;">sel_name</span> <span class="n" style="color: #333;">hs_sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsSigType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="n" style="color: #333;">sel_name</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="n" style="color: #333;">hs_sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">local_meth_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">local_meth_id</span></span>
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<pre style="margin: 0;">+<span id="LC1728" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="n" style="color: #333;">sel_name</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- False <=> do not report redundant constraints when</span></span>
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking instance-sig <= class-meth-sig</span></span>
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<pre style="margin: 0;">+<span id="LC1731" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The instance-sig is the focus here; the class-meth-sig</span></span>
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<pre style="margin: 0;">+<span id="LC1732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is fixed (#18036)</span></span>
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">hs_wrap</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">addErrCtxtM</span> <span class="p">(</span><span class="n" style="color: #333;">methSigCtxt</span> <span class="n" style="color: #333;">sel_name</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">local_meth_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="LC1734" class="line" lang="haskell"> <span class="n" style="color: #333;">tcSubType_NC</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig_ty</span> <span class="n" style="color: #333;">local_meth_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1735" 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;">sig_ty</span><span class="p">,</span> <span class="n" style="color: #333;">hs_wrap</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1736" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1737" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">inner_meth_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newName</span> <span class="p">(</span><span class="n" style="color: #333;">nameOccName</span> <span class="n" style="color: #333;">sel_name</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1734" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inner_meth_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">inner_meth_name</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunSigCtxt</span> <span class="n" style="color: #333;">sel_name</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC1739" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> check for redundant constraints in the</span></span>
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<pre style="margin: 0;">+<span id="LC1740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- user-specified instance signature</span></span>
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<pre style="margin: 0;">+<span id="LC1741" class="line" lang="haskell"> <span class="n" style="color: #333;">inner_meth_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">inner_meth_name</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"> <span class="n" style="color: #333;">inner_meth_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CompleteSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inner_meth_id</span></span>
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<pre style="margin: 0;"> <span id="LC1743" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getLoc</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">hs_sig_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386b5ad22ad8724204be13e29f1e5181574880fa#4b27b5498774af2650947698f023f4e40beeac18"><strong>testsuite/tests/typecheck/should_compile/T18036.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 InstanceSigs #-}</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;">{-# OPTIONS_GHC -Wredundant-constraints #-}</span></span>
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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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18036</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Fold</span> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">fold</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Identity</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;">Identity</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Fold</span> <span class="kt" style="color: #458; font-weight: 600;">Identity</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="n" style="color: #333;">fold</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Identity</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="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">fold</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Identity</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386b5ad22ad8724204be13e29f1e5181574880fa#c3804a76f71e7c9059b53e0855b541cf3a5fc140"><strong>testsuite/tests/typecheck/should_compile/T18036a.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 InstanceSigs #-}</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;">{-# OPTIONS_GHC -Wredundant-constraints #-}</span></span>
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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="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18036</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Fold</span> <span class="n" style="color: #333;">f</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">fold</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Identity</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;">Identity</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Here we /should/ warn about redundant constraints in the</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instance signature, since we can remove them</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Fold</span> <span class="kt" style="color: #458; font-weight: 600;">Identity</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;">fold</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</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;">Identity</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;">fold</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Identity</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386b5ad22ad8724204be13e29f1e5181574880fa#cacf20fd5a3b897c5893309162d40f41e5fb7b70"><strong>testsuite/tests/typecheck/should_compile/T18036a.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18036a.hs:14:13: warning: [-Wredundant-constraints]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Redundant constraint: Monoid a</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> fold :: forall a. Monoid a => Identity a -> a</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the instance declaration for ‘Fold Identity’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386b5ad22ad8724204be13e29f1e5181574880fa#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/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">@@ -702,3 +702,5 @@ test('T17792', normal, compile, [''])</td>
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17024</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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703
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17021a</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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704
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704
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18005</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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<pre style="margin: 0;">+<span id="LC705" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036</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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<pre style="margin: 0;">+<span id="LC706" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036a</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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