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<h3>
Krzysztof Gogolewski pushed to branch wip/infer-mult-more
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/83047a104850ff77e076bc66e6127015dfdd5f00">83047a10</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-21T18:09:03+02:00</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>5 changed files:</h4>
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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<li class="file-stats">
<a href="#3fa1c31577a138583da8f797e3719b53c0247443">
testsuite/tests/dependent/should_compile/dynamic-paper.stderr
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+
testsuite/tests/linear/should_compile/T18731.hs
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<a href="#b2116411d7a46bfc94bcd94fab260cbfab5ad414">
testsuite/tests/linear/should_compile/all.T
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<li class="file-stats">
<a href="#496e235ba715f41fdcb8c8dfcb270637414842d7">
testsuite/tests/typecheck/should_fail/T7869.stderr
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<h4>Changes:</h4>
<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83047a104850ff77e076bc66e6127015dfdd5f00#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.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">@@ -340,9 +340,12 @@ matchActualFunTySigma herald ct_orig mb_thing err_info fun_ty</td>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="haskell"> <span class="n" style="color: #333;">defer</span> <span class="n" style="color: #333;">fun_ty</span></span>
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<pre style="margin: 0;"> <span id="LC341" 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="n" style="color: #333;">arg_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>
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<pre style="margin: 0;"> <span id="LC342" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>
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<pre style="margin: 0;">-<span id="LC343" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTyMany</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mult</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlexiTyVarTy</span> <span class="n" style="color: #333;">multiplicityTy</span></span>
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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need a new variable for multiplicity (#18731)</span></span>
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<pre style="margin: 0;">+<span id="LC345" 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="LC346" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">unif_fun_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTy</span> <span class="n" style="color: #333;">mult</span> <span class="n" style="color: #333;">arg_ty</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyType</span> <span class="n" style="color: #333;">mb_thing</span> <span class="n" style="color: #333;">fun_ty</span> <span class="n" style="color: #333;">unif_fun_ty</span></span>
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<pre style="margin: 0;">-<span id="LC345" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">unrestricted</span></span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Scaled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">mult</span></span> <span class="n" style="color: #333;">arg_ty</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC350" 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="LC351" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ctxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83047a104850ff77e076bc66e6127015dfdd5f00#3fa1c31577a138583da8f797e3719b53c0247443"><strong>testsuite/tests/dependent/should_compile/dynamic-paper.stderr</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">@@ -12,4 +12,4 @@ Simplifier ticks exhausted</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> simplifier non-termination has been judged acceptable.</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> </span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> To see detailed counts use -ddump-simpl-stats</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> Total ticks: 1<span class="idiff left right">3696</span>1</span></pre>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Total ticks: 1<span class="idiff left right">4080</span>1</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83047a104850ff77e076bc66e6127015dfdd5f00#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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83047a104850ff77e076bc66e6127015dfdd5f00#b2116411d7a46bfc94bcd94fab260cbfab5ad414"><strong>testsuite/tests/linear/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -35,3 +35,4 @@ test('MultConstructor', expect_broken(broken_multiplicity_syntax), compile, ['']</td>
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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;">LinearLetRec</span><span class="p">',</span> <span class="nv" style="color: #008080;">expect_broken</span><span class="p">(</span><span class="mi" style="color: #099;">405</span><span class="p">),</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -dlinear-core-lint</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;">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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<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;">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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83047a104850ff77e076bc66e6127015dfdd5f00#496e235ba715f41fdcb8c8dfcb270637414842d7"><strong>testsuite/tests/typecheck/should_fail/T7869.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">T7869.hs:3:12: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">b1’ with ‘b</span>’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">a1’ with ‘a</span>’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Expected: [a1] -> b1</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Actual: [a] -> b</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> ‘<span class="idiff left right">b</span>1’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> ‘<span class="idiff left right">a</span>1’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> an expression type signature:</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> forall a1 b1. [a1] -> b1</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> at T7869.hs:3:20-27</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> ‘<span class="idiff left right">b</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> ‘<span class="idiff left right">a</span>’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> the inferred type of f :: [a] -> b</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> at T7869.hs:3:1-27</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> • In the expression: f x</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> In the expression: (\ x -> f x) :: [a] -> b</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> In an equation for ‘f’: f = (\ x -> f x) :: [a] -> b</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> • Relevant bindings include f :: [a] -> b (bound at T7869.hs:3:1)</span></pre>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> x :: [a1] (bound at T7869.hs:3:7)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> f :: [a] -> b (bound at T7869.hs:3:1)</span></pre>
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