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<h3>
Alan Zimmerman pushed to branch wip/T18888
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4">791cb337</a></strong>
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<span>by Alan Zimmerman</span>
<i>at 2020-11-02T08:23:42+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Restrict Linear arrow %1 to exactly literal 1 only
This disallows `a %001 -> b`, and makes sure the type literal is
printed from its SourceText so it is clear why.
Closes #18888
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<h4>7 changed files:</h4>
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<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
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<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<a href="#b35af0e500cfd952761229a3cbd463c189dfe707">
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+
testsuite/tests/linear/should_fail/T18888.hs
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testsuite/tests/linear/should_fail/T18888.stderr
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<li class="file-stats">
<a href="#4e427bb44e7811194b98935b0d85cc48e50c86e0">
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testsuite/tests/linear/should_fail/T18888_datakinds.hs
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<a href="#74e942aebbf93f92024c4468c3a0c2fffe6b7b08">
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testsuite/tests/linear/should_fail/T18888_datakinds.stderr
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<li class="file-stats">
<a href="#9eaf3d28760bfe4fb6839aeb7cad53d8f9bac1c1">
testsuite/tests/linear/should_fail/all.T
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<h4>Changes:</h4>
<li id="018be522bc4813b147a1525e4f96a7a493207d96">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#018be522bc4813b147a1525e4f96a7a493207d96"><strong>compiler/GHC/Hs/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">@@ -1982,8 +1982,8 @@ ppr_fun_ty mult ty1 ty2</td>
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1982
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1982
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<pre style="margin: 0;"> <span id="LC1982" class="line" lang="haskell"></span>
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1983
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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;">--------------------------</span></span>
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1984
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1984
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<pre style="margin: 0;"> <span id="LC1984" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_tylit</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsTyLit</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</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;">ppr_tylit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsNumTy</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">i</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">integer</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">i</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="1986" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1986
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<pre style="margin: 0;">-<span id="LC1986" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_tylit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsStrTy</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">s</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">show</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">s</span></span><span class="p">)</span></span>
</pre>
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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;">ppr_tylit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsNumTy</span> <span class="n" style="color: #333;"><span class="idiff left">source</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">i</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pprWithSourceText</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">source</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">integer</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">i</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="1986" 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">
1986
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<pre style="margin: 0;">+<span id="LC1986" class="line" lang="haskell"><span class="n" style="color: #333;">ppr_tylit</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsStrTy</span> <span class="n" style="color: #333;"><span class="idiff left">source</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">s</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pprWithSourceText</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">source</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">show</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">s</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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1987
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1987
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<pre style="margin: 0;"> <span id="LC1987" class="line" lang="haskell"></span>
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1988
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1988
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<pre style="margin: 0;"> <span id="LC1988" class="line" lang="haskell"></span>
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1989
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1989
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<pre style="margin: 0;"> <span id="LC1989" class="line" lang="haskell"><span class="cd">-- | @'hsTypeNeedsParens' p t@ returns 'True' if the type @t@ needs parentheses</span></span>
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<li id="446cb12ca6cefaf1c6eb79b7db643632744263c7">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#446cb12ca6cefaf1c6eb79b7db643632744263c7"><strong>compiler/GHC/Parser/PostProcess.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2620" 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="2620" 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">@@ -2620,7 +2620,8 @@ mkLHsOpTy x op y =</td>
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2620
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2620
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<pre style="margin: 0;"> <span id="LC2620" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsOpTy</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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2621
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2621
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<pre style="margin: 0;"> <span id="LC2621" class="line" lang="haskell"></span>
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2622
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2622
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<pre style="margin: 0;"> <span id="LC2622" class="line" lang="haskell"><span class="n" style="color: #333;">mkMultTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IsUnicodeSyntax</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Token</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsArrow</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">AddAnn</span><span class="p">)</span></span>
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2623
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<pre style="margin: 0;">-<span id="LC2623" class="line" lang="haskell"><span class="n" style="color: #333;">mkMultTy</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">tok</span> <span class="n" style="color: #333;">t</span><span class="o" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsNumTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="mi" style="color: #099;">1</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC2623" class="line" lang="haskell"><span class="n" style="color: #333;">mkMultTy</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">tok</span> <span class="n" style="color: #333;">t</span><span class="o" 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="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyLit</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsNumTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SourceText</span> <span class="s" style="color: #d14;">"1"</span><span class="p">)</span> <span class="mi" style="color: #099;">1</span><span class="p">)))</span></span>
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<pre style="margin: 0;">+<span id="LC2624" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #18888 for the use of (SourceText "1") above</span></span>
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<pre style="margin: 0;"> <span id="LC2625" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLinearArrow</span> <span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">AddAnn</span> <span class="kt" style="color: #458; font-weight: 600;">AnnPercentOne</span> <span class="p">(</span><span class="n" style="color: #333;">combineLocs</span> <span class="n" style="color: #333;">tok</span> <span class="n" style="color: #333;">t</span><span class="p">))</span></span>
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2626
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<pre style="margin: 0;"> <span id="LC2626" class="line" lang="haskell"><span class="n" style="color: #333;">mkMultTy</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">tok</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsExplicitMult</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">t</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">AddAnn</span> <span class="kt" style="color: #458; font-weight: 600;">AnnPercent</span> <span class="p">(</span><span class="n" style="color: #333;">getLoc</span> <span class="n" style="color: #333;">tok</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2627" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#b35af0e500cfd952761229a3cbd463c189dfe707"><strong>testsuite/tests/linear/should_fail/T18888.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 LinearTypes #-}</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;">T18888</span> <span class="kr" style="font-weight: 600;">where</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="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">001</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span> <span class="n" style="color: #333;">x</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#2d0d7829849d5209f687049f3882a65e69bd5c04"><strong>testsuite/tests/linear/should_fail/T18888.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18888.hs:4:9:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Illegal type: ‘001’ Perhaps you intended to use DataKinds</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#4e427bb44e7811194b98935b0d85cc48e50c86e0"><strong>testsuite/tests/linear/should_fail/T18888_datakinds.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 LinearTypes #-}</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 DataKinds #-}</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;">T18888</span> <span class="kr" style="font-weight: 600;">where</span></span>
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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="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">%</span><span class="mi" style="color: #099;">001</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span> <span class="n" style="color: #333;">x</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#74e942aebbf93f92024c4468c3a0c2fffe6b7b08"><strong>testsuite/tests/linear/should_fail/T18888_datakinds.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">T18888_datakinds.hs:5:9:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Expected kind ‘GHC.Types.Multiplicity’,</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> but ‘001’ has kind ‘GHC.Num.Natural.Natural’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the type signature: f :: a %001 -> b</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/791cb337549df002ff4323299e6baf825fe994f4#9eaf3d28760bfe4fb6839aeb7cad53d8f9bac1c1"><strong>testsuite/tests/linear/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">@@ -32,3 +32,5 @@ test('LinearIf', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearPatternGuardWildcard</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="LC33" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearFFI</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="LC34" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearTHFail</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="LC35" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18888</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="LC36" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18888_datakinds</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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