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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
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/7a92bf457b225c58f3396cd950e75f42915ddb27">7a92bf45</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-10-15T17:23:04-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tiny little changes
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<h4>3 changed files:</h4>
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<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<h4>Changes:</h4>
<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a92bf457b225c58f3396cd950e75f42915ddb27#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1974" 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="1974" 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">@@ -1974,7 +1974,8 @@ buildSynTyCon name binders res_kind roles rhs</td>
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1974
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1974
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<pre style="margin: 0;"> <span id="LC1974" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1975
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<td class="diff-line-num new_line" data-linenumber="1975" 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">
1975
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<pre style="margin: 0;"> <span id="LC1975" class="line" lang="haskell"> <span class="n" style="color: #333;">is_tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">rhs</span></span>
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<td class="diff-line-num old_line" data-linenumber="1976" 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">
1976
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<td class="diff-line-num new_line" data-linenumber="1976" 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">
1976
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<pre style="margin: 0;"> <span id="LC1976" class="line" lang="haskell"> <span class="n" style="color: #333;">is_fam_free</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isFamFreeTy</span> <span class="n" style="color: #333;">rhs</span></span>
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1977
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<pre style="margin: 0;">-<span id="LC1977" class="line" lang="haskell"> <span class="n" style="color: #333;">is_forgetful</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="n" style="color: #333;">binders</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1978" 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="1977" 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">
1977
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<pre style="margin: 0;">+<span id="LC1977" class="line" lang="haskell"> <span class="n" style="color: #333;">is_forgetful</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="p">(`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="n" style="color: #333;">binders</span> <span class="o" style="font-weight: 600;">||</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1978" 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">
1978
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<pre style="margin: 0;">+<span id="LC1978" class="line" lang="haskell"> <span class="n" style="color: #333;">uniqSetAny</span> <span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">tyConsOfType</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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1978
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"></span>
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1979
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1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1980
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1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a92bf457b225c58f3396cd950e75f42915ddb27#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2216" 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="2216" 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">@@ -2216,10 +2216,14 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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2216
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2216
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<pre style="margin: 0;"> <span id="LC2216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">arg1</span><span class="p">,</span> <span class="n" style="color: #333;">arg2</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zip3</span> <span class="n" style="color: #333;">fun_args1</span> <span class="n" style="color: #333;">fun_args2</span> <span class="n" style="color: #333;">inj</span> <span class="p">]</span></span>
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2217
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2217
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<pre style="margin: 0;"> <span id="LC2217" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2218
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2218
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<pre style="margin: 0;"> <span id="LC2218" class="line" lang="haskell"></span>
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2219
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<pre style="margin: 0;">-<span id="LC2219" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">fun_args2</span></span>
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2219
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<pre style="margin: 0;">+<span id="LC2219" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvs1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">fun_args1</span></span>
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2220
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<pre style="margin: 0;">+<span id="LC2220" class="line" lang="haskell"> <span class="n" style="color: #333;">tvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">fun_args2</span></span>
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2220
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2221
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<pre style="margin: 0;"> <span id="LC2221" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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2221
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<pre style="margin: 0;">-<span id="LC2221" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">anyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span><span class="p">)</span> <span class="n" style="color: #333;">tvs2</span></span>
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<pre style="margin: 0;">+<span id="LC2222" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">anyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span><span class="p">)</span> <span class="n" style="color: #333;">tvs2</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">&&</span></span></span>
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<pre style="margin: 0;"> <span id="LC2223" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- swap 'em: Note [Put touchable variables on the left]</span></span>
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<pre style="margin: 0;">+<span id="LC2224" class="line" lang="haskell"> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">anyVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span><span class="p">)</span> <span class="n" style="color: #333;">tvs1</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2225" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this check is just to avoid unfruitful swapping</span></span>
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<pre style="margin: 0;">+<span id="LC2226" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2227" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">do_swap</span></span>
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<pre style="margin: 0;"> <span id="LC2228" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">canEqCanLHSFinish</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span> <span class="n" style="color: #333;">lhs2</span> <span class="p">(</span><span class="n" style="color: #333;">ps_xi1</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">sym_mco</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2229" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">finish_without_swapping</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a92bf457b225c58f3396cd950e75f42915ddb27#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.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">@@ -2439,7 +2439,7 @@ matchClassInst dflags inerts clas tys loc</td>
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<pre style="margin: 0;"> <span id="LC2439" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- First check whether there is an in-scope Given that could</span></span>
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<pre style="margin: 0;"> <span id="LC2440" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- match this constraint. In that case, do not use any instance</span></span>
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<pre style="margin: 0;"> <span id="LC2441" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- whether top level, or local quantified constraints.</span></span>
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<pre style="margin: 0;">-<span id="LC2442" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ee Note [Instance and Given overlap]</span></span>
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<pre style="margin: 0;">+<span id="LC2442" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">S</span>ee Note [Instance and Given overlap]</span></span>
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2443
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<pre style="margin: 0;"> <span id="LC2443" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">xopt</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">IncoherentInstances</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2444
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2444
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<pre style="margin: 0;"> <span id="LC2444" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">naturallyCoherentClass</span> <span class="n" style="color: #333;">clas</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2445" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">matchable_givens</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matchableGivens</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">inerts</span></span>
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