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<h3>
Ryan Scott pushed to branch wip/T18612
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5">222a8788</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-08-26T19:16:56-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make {hsExpr,hsType,pat}NeedsParens aware of boxed 1-tuples
`hsExprNeedsParens`, `hsTypeNeedsParens`, and `patNeedsParens`
previously assumed that all uses of explicit tuples in the source
syntax never need to be parenthesized. This is true save for one
exception: boxed one-tuples, which use the `Solo` data type from
`GHC.Tuple` instead of special tuple syntax. This patch adds the
necessary logic to the three `*NeedsParens` functions to handle
`Solo` correctly.
Fixes #18612.
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<h4>6 changed files:</h4>
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<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<li class="file-stats">
<a href="#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f">
compiler/GHC/Hs/Pat.hs
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<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
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<li class="file-stats">
<a href="#b1d5e5f5b63851099a8565cf1bf06a9a6cd5f16e">
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+
testsuite/tests/th/T18612.hs
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<li class="file-stats">
<a href="#d2d5fb7a4b0143ec0a7c3a9afef1fac10f31920c">
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testsuite/tests/th/T18612.stderr
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<li class="file-stats">
<a href="#6f885f60b8c0fea6b94dd73a67d02212eedb4498">
testsuite/tests/th/all.T
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<h4>Changes:</h4>
<li id="cc97d81e7223ad4a3a5e801156ca632f9fa75654">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1320" 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">@@ -1320,6 +1320,11 @@ hsExprNeedsParens p = go</td>
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NegApp</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">topPrec</span></span>
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<td class="diff-line-num old_line" data-linenumber="1321" 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">
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<td class="diff-line-num new_line" data-linenumber="1321" 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">
1321
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionL</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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<td class="diff-line-num new_line" data-linenumber="1322" 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">
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<pre style="margin: 0;"> <span id="LC1322" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SectionR</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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<td class="diff-line-num new new_line" data-linenumber="1323" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1323" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Special-case unary boxed tuple applications so that they are</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1324" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1324" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesized as `Identity (Solo x)`, not `Identity Solo x` (#18612)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1325" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1325" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [One-tuples] in GHC.Builtin.Types</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1326" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExplicitTuple</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">Present</span><span class="p">{}]</span> <span class="kt" style="color: #458; font-weight: 600;">Boxed</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1327" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1327" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">appPrec</span></span>
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExplicitTuple</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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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ExplicitSum</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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<pre style="margin: 0;"> <span id="LC1330" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLam</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">topPrec</span></span>
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<li id="0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f"><strong>compiler/GHC/Hs/Pat.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">@@ -857,7 +857,12 @@ patNeedsParens p = go</td>
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BangPat</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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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ParPat</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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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AsPat</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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860
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TuplePat</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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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Special-case unary boxed tuple applications so that they are</span></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesized as `Identity (Solo x)`, not `Identity Solo x` (#18612)</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [One-tuples] in GHC.Builtin.Types</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TuplePat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="kr" style="font-weight: 600;">_</span><span class="p">]</span> <span class="kt" style="color: #458; font-weight: 600;">Boxed</span><span class="p">)</span></span>
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864
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">appPrec</span></span>
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865
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TuplePat</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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861
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SumPat</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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862
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ListPat</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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863
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitPat</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">l</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hsLitNeedsParens</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">l</span></span>
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<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1979" 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="1979" 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">@@ -1979,6 +1979,15 @@ hsTypeNeedsParens p = go_hs_ty</td>
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1979
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecTy</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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1980
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1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</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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1981
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1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsFunTy</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">funPrec</span></span>
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1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Special-case unary boxed tuple applications so that they are</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1983
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<pre style="margin: 0;">+<span id="LC1983" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesized as `Identity (Solo x)`, not `Identity Solo x` (#18612)</span></span>
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1984
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<pre style="margin: 0;">+<span id="LC1984" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [One-tuples] in GHC.Builtin.Types</span></span>
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1985
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<pre style="margin: 0;">+<span id="LC1985" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTupleTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">con</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty</span><span class="p">])</span></span>
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1986
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<pre style="margin: 0;">+<span id="LC1986" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">con</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1987
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<pre style="margin: 0;">+<span id="LC1987" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsBoxedTuple</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">appPrec</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1988" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1988
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<pre style="margin: 0;">+<span id="LC1988" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsBoxedOrConstraintTuple</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">appPrec</span></span>
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1989
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<pre style="margin: 0;">+<span id="LC1989" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsConstraintTuple</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_hs_ty</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1990
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<pre style="margin: 0;">+<span id="LC1990" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HsUnboxedTuple</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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1982
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1991
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<pre style="margin: 0;"> <span id="LC1991" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTupleTy</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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<td class="diff-line-num old_line" data-linenumber="1983" 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">
1983
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<td class="diff-line-num new_line" data-linenumber="1992" 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">
1992
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<pre style="margin: 0;"> <span id="LC1992" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSumTy</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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1984
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<td class="diff-line-num new_line" data-linenumber="1993" 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">
1993
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<pre style="margin: 0;"> <span id="LC1993" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsKindSig</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">sigPrec</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1986" 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="1995" 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">@@ -1986,6 +1995,11 @@ hsTypeNeedsParens p = go_hs_ty</td>
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1986
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<td class="diff-line-num new_line" data-linenumber="1995" 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">
1995
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<pre style="margin: 0;"> <span id="LC1995" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIParamTy</span><span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">topPrec</span></span>
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1987
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<td class="diff-line-num new_line" data-linenumber="1996" 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">
1996
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<pre style="margin: 0;"> <span id="LC1996" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsSpliceTy</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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<td class="diff-line-num old_line" data-linenumber="1988" 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">
1988
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<td class="diff-line-num new_line" data-linenumber="1997" 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">
1997
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<pre style="margin: 0;"> <span id="LC1997" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitListTy</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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<td class="diff-line-num new old_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Special-case unary boxed tuple applications so that they are</span></span>
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1999
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<pre style="margin: 0;">+<span id="LC1999" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parenthesized as `Proxy ('Solo x)`, not `Proxy 'Solo x` (#18612)</span></span>
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2000
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<pre style="margin: 0;">+<span id="LC2000" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [One-tuples] in GHC.Builtin.Types</span></span>
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2001
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<pre style="margin: 0;">+<span id="LC2001" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitTupleTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="kr" style="font-weight: 600;">_</span><span class="p">])</span></span>
</pre>
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</td>
<td class="diff-line-num new new_line" data-linenumber="2002" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2002
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<pre style="margin: 0;">+<span id="LC2002" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">p</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">appPrec</span></span>
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1989
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2003
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<pre style="margin: 0;"> <span id="LC2003" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitTupleTy</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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<td class="diff-line-num old_line" data-linenumber="1990" 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">
1990
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<td class="diff-line-num new_line" data-linenumber="2004" 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">
2004
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<pre style="margin: 0;"> <span id="LC2004" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyLit</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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<td class="diff-line-num old_line" data-linenumber="1991" 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">
1991
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2005
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<pre style="margin: 0;"> <span id="LC2005" class="line" lang="haskell"> <span class="n" style="color: #333;">go_hs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</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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<li id="b1d5e5f5b63851099a8565cf1bf06a9a6cd5f16e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5#b1d5e5f5b63851099a8565cf1bf06a9a6cd5f16e"><strong>testsuite/tests/th/T18612.hs</strong></a>
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1
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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 DataKinds #-}</span></span>
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2
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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 TemplateHaskell #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -ddump-splices #-}</span></span>
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4
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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;">T18612</span> <span class="kr" style="font-weight: 600;">where</span></span>
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5
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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;">import</span> <span class="nn" style="color: #555;">Data.Functor.Identity</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Language.Haskell.TH</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="n" style="color: #333;">arrowT</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">conT</span> <span class="sc" style="color: #d14;">''</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">I</span><span class="n" style="color: #333;">dentity</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">tupleT</span> <span class="mi" style="color: #099;">1</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">tupleT</span> <span class="mi" style="color: #099;">0</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">conT</span> <span class="sc" style="color: #d14;">''</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">I</span><span class="n" style="color: #333;">dentity</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">tupleT</span> <span class="mi" style="color: #099;">1</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">tupleT</span> <span class="mi" style="color: #099;">0</span><span class="p">))))</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="n" style="color: #333;">conP</span> <span class="kt" style="color: #458; font-weight: 600;">'Identity</span> <span class="p">[</span><span class="n" style="color: #333;">tupP</span> <span class="p">[</span><span class="n" style="color: #333;">tupP</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">]])</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="n" style="color: #333;">conE</span> <span class="kt" style="color: #458; font-weight: 600;">'Identity</span> <span class="p">`</span><span class="n" style="color: #333;">appE</span><span class="p">`</span> <span class="n" style="color: #333;">tupE</span> <span class="p">[</span><span class="n" style="color: #333;">tupE</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">G</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">$</span><span class="p">(</span><span class="n" style="color: #333;">conT</span> <span class="sc" style="color: #d14;">''</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">P</span><span class="n" style="color: #333;">roxy</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">promotedTupleT</span> <span class="mi" style="color: #099;">1</span> <span class="p">`</span><span class="n" style="color: #333;">appT</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">tupleT</span> <span class="mi" style="color: #099;">0</span><span class="p">)))</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5#d2d5fb7a4b0143ec0a7c3a9afef1fac10f31920c"><strong>testsuite/tests/th/T18612.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">T18612.hs:14:11-68: Splicing type</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext"> conT ''Proxy `appT` (promotedTupleT 1 `appT` (tupleT 0))</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> ======></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Proxy ('Solo ())</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">T18612.hs:(10,7)-(11,75): Splicing type</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> arrowT `appT` (conT ''Identity `appT` (tupleT 1 `appT` (tupleT 0)))</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> `appT` (conT ''Identity `appT` (tupleT 1 `appT` (tupleT 0)))</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"> Identity (Solo ()) -> Identity (Solo ())</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T18612.hs:12:4-36: Splicing pattern</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> conP 'Identity [tupP [tupP []]] ======> Identity (Solo())</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">T18612.hs:12:41-78: Splicing expression</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> conE 'Identity `appE` tupE [tupE []] ======> Identity (Solo ())</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/222a878875b0e093e82f81d6f83fa39ac42d53b5#6f885f60b8c0fea6b94dd73a67d02212eedb4498"><strong>testsuite/tests/th/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">@@ -513,3 +513,4 @@ test('T18102b', extra_files(['T18102b_aux.hs']), compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18121</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="LC514" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18123</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="LC515" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18388</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="LC516" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18612</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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