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<h3>
 Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357">2707c4ea</a></strong>
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<span>by Arnaud Spiwack</span>
<i>at 2020-09-25T21:13:58-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pattern guards BindStmt always use multiplicity Many

Fixes #18439 .

The rhs of the pattern guard was consumed with multiplicity one, while
the pattern assumed it was Many. We use Many everywhere instead.

This is behaviour consistent with that of `case` expression. See #18738.
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<h4>4 changed files:</h4>
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compiler/GHC/Tc/Gen/Match.hs
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testsuite/tests/linear/should_fail/LinearPatternGuardWildcard.hs
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testsuite/tests/linear/should_fail/LinearPatternGuardWildcard.stderr
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testsuite/tests/linear/should_fail/all.T
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<h4>Changes:</h4>
<li id="3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9"><strong>compiler/GHC/Tc/Gen/Match.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="397" 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="397" 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">@@ -397,7 +397,14 @@ tcGuardStmt _ (BodyStmt _ guard _ _) res_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BodyStmt</span> <span class="n" style="color: #333;">boolTy</span> <span class="n" style="color: #333;">guard'</span> <span class="n" style="color: #333;">noSyntaxExpr</span> <span class="n" style="color: #333;">noSyntaxExpr</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"><span class="n" style="color: #333;">tcGuardStmt</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BindStmt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">-<span id="LC400" 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;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC400" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span>  <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- The Many on the next line and the unrestricted on the line after</span></span>
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- are linked. These must be the same multiplicity. Consider</span></span>
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<pre style="margin: 0;">+<span id="LC402" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">--   x <- rhs -> u</span></span>
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<pre style="margin: 0;">+<span id="LC403" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- The multiplicity of x in u must be the same as the multiplicity at</span></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- which the rhs has been consumed. When solving #18738, we want these</span></span>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- two multiplicity to still be the same.</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell">          <span class="p">(</span><span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcScalingUsage</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcInferRhoNC</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell">                                   <span class="c1" style="color: #998; font-style: italic;">-- Stmt has a context already</span></span>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell">        <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">pat'</span><span class="p">,</span> <span class="n" style="color: #333;">thing</span><span class="p">)</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckPat_O</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StmtCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">lexprCtOrigin</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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403
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410
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell">                                         <span class="n" style="color: #333;">pat</span> <span class="p">(</span><span class="n" style="color: #333;">unrestricted</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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</li>
<li id="1ad049a7b967742a37712bb8c22ad74e6c93dbe5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357#1ad049a7b967742a37712bb8c22ad74e6c93dbe5"><strong>testsuite/tests/linear/should_fail/LinearPatternGuardWildcard.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 LinearTypes #-}</span></span>
</pre>
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2
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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;">LinearPatternGuardWildcard</span> <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
</pre>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See #18439</span></span>
</pre>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
</pre>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">unsafeConsume</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="nb" style="color: #0086b3;">()</span></span>
</pre>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="n" style="color: #333;">unsafeConsume</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">|</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<br>
</li>
<li id="4a4bc7d89e9876aecd57118c56c7e5e1417a8257">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357#4a4bc7d89e9876aecd57118c56c7e5e1417a8257"><strong>testsuite/tests/linear/should_fail/LinearPatternGuardWildcard.stderr</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">LinearPatternGuardWildcard.hs:7:15: error:</span>
</pre>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Couldn't match type ‘'Many’ with ‘'One’</span>
</pre>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">        arising from multiplicity of ‘x’</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">    • In an equation for ‘unsafeConsume’: unsafeConsume x | _ <- x = ()</span></pre>
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<br>
</li>
<li id="9eaf3d28760bfe4fb6839aeb7cad53d8f9bac1c1">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357#9eaf3d28760bfe4fb6839aeb7cad53d8f9bac1c1"><strong>testsuite/tests/linear/should_fail/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="27" 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">@@ -27,3 +27,4 @@ test('LinearPolyType', expect_broken([436, broken_multiplicity_syntax]), compile</td>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearBottomMult</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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28
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearSequenceExpr</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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<pre style="margin: 0;"> <span id="LC29" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearIf</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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<pre style="margin: 0;">+<span id="LC30" 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></pre>
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