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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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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bda55fa0444310079ab89f2d28ddb8982975b646">bda55fa0</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:18:22-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make 'undefined x' linear in 'x' (#18731)
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<h4>3 changed files:</h4>
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compiler/GHC/Tc/Gen/App.hs
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testsuite/tests/linear/should_compile/T18731.hs
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testsuite/tests/linear/should_compile/all.T
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<h4>Changes:</h4>
<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bda55fa0444310079ab89f2d28ddb8982975b646#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.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">@@ -19,6 +19,7 @@ module GHC.Tc.Gen.App</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Gen</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Expr</span><span class="p">(</span> <span class="n" style="color: #333;">tcCheckPolyExprNC</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">multiplicityTy</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Head</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="499" 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="500" 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">@@ -499,13 +500,17 @@ tcInstFun do_ql inst_final rn_fun fun_sigma rn_args</td>
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499
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- - We need the freshly allocated unification variables, to extend</span></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- delta with.</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It's easier just to do the job directly here.</span></span>
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<pre style="margin: 0;">-<span id="LC502" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">arg_nus</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">replicateM</span> <span class="p">(</span><span class="n" style="color: #333;">countLeadingValArgs</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="n" style="color: #333;">newOpenFlexiTyVar</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <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;">valArgsCount</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">countLeadingValArgs</span> <span class="n" style="color: #333;">args</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg_nus</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">replicateM</span> <span class="n" style="color: #333;">valArgsCount</span> <span class="n" style="color: #333;">newOpenFlexiTyVar</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need variables for multiplicity (#18731)</span></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Otherwise, 'undefined x' wouldn't be linear in x</span></span>
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mults</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">replicateM</span> <span class="n" style="color: #333;">valArgsCount</span> <span class="p">(</span><span class="n" style="color: #333;">newFlexiTyVarTy</span> <span class="n" style="color: #333;">multiplicityTy</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_nu</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVar</span></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">liftedTypeKind</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">kappa</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">delta'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">delta</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSetList</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">res_nu</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_nus</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">arg_nus</span></span>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">res_nu</span></span>
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys<span class="idiff left">Many</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">arg_tys</span></span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"> <span class="n" style="color: #333;">fun_ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">zipWithEqual</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"tcInstFun"</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkScaled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mults</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg_tys</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"> <span class="n" style="color: #333;">co_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpCastN</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcGReflLeftCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fun_ty'</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"> <span class="n" style="color: #333;">acc'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addArgWrap</span> <span class="n" style="color: #333;">co_wrap</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Suppose kappa :: kk</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bda55fa0444310079ab89f2d28ddb8982975b646#28a057f5fb325ee5aa0315a4d4a2bc1a5744c8f3"><strong>testsuite/tests/linear/should_compile/T18731.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;">T18731</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="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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,3 +36,4 @@ test('LinearLetRec', expect_broken(405), compile, ['-O -dlinear-core-lint'])</td>
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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;">LinearTH1</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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37
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearTH2</span><span class="p">',</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="nv" style="color: #008080;">broken_multiplicity_syntax</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="LC38" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearHole</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="LC39" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18731</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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