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<h3>
Richard Eisenberg pushed to branch wip/T18753
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/4c7e736da65f71511d360a087bf5fb757f6a397b">4c7e736d</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-09-26T22:25:04-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Omit redundant kind equality check in solver
See updated Note [Use loose types in inert set] in
GHC.Tc.Solver.Monad.
Close #18753.
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<h4>1 changed file:</h4>
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<h4>Changes:</h4>
<li id="0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7e736da65f71511d360a087bf5fb757f6a397b#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.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">@@ -2357,10 +2357,8 @@ lookupFlatCache fam_tc tys</td>
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<pre style="margin: 0;"> <span id="LC2357" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_flats</span> <span class="n" style="color: #333;">flat_cache</span><span class="p">])</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2358" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC2359" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup_inerts</span> <span class="n" style="color: #333;">inert_funeqs</span></span>
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<pre style="margin: 0;">-<span id="LC2360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CFunEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_fsk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsk</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">cc_tyargs</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 right">xis</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC2360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CFunEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_fsk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fsk</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2361" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findFunEq</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tys</span></span>
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2362
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<pre style="margin: 0;">-<span id="LC2362" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tys</span> <span class="p">`</span><span class="n" style="color: #333;">eqTypes</span><span class="p">`</span> <span class="n" style="color: #333;">xis</span> <span class="c1" style="color: #998; font-style: italic;">-- The lookup might find a near-match; see</span></span>
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<pre style="margin: 0;">-<span id="LC2363" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Use loose types in inert set]</span></span>
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<pre style="margin: 0;"> <span id="LC2362" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvCoercion</span> <span class="n" style="color: #333;">ctev</span><span class="p">,</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">fsk</span><span class="p">,</span> <span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2363" 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="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC2364" class="line" lang="haskell"></span>
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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">@@ -2377,16 +2375,14 @@ lookupInInerts loc pty</td>
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<pre style="margin: 0;"> <span id="LC2375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: No caching for equalities, IPs, holes, or errors</span></span>
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<pre style="margin: 0;"> <span id="LC2376" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC2377" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2380" class="line" lang="haskell"><span class="cd">-- | Look up a dictionary inert. NB: the returned 'CtEvidence' might not</span></span>
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<pre style="margin: 0;">-<span id="LC2381" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- match the input exactly. Note [Use loose types in inert set].</span></span>
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<pre style="margin: 0;">+<span id="LC2378" class="line" lang="haskell"><span class="cd">-- | Look up a dictionary inert.</span></span>
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<pre style="margin: 0;"> <span id="LC2379" class="line" lang="haskell"><span class="n" style="color: #333;">lookupInertDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC2380" class="line" lang="haskell"><span class="n" style="color: #333;">lookupInertDict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dicts</span> <span class="p">})</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC2381" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">findDict</span> <span class="n" style="color: #333;">dicts</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2385
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2382
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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2386
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2383
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<pre style="margin: 0;"> <span id="LC2383" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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2387
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2384
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<pre style="margin: 0;"> <span id="LC2384" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2388" class="line" lang="haskell"><span class="cd">-- | Look up a solved inert. NB: the returned 'CtEvidence' might not</span></span>
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2389
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<pre style="margin: 0;">-<span id="LC2389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- match the input exactly. See Note [Use loose types in inert set].</span></span>
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<pre style="margin: 0;">+<span id="LC2385" class="line" lang="haskell"><span class="cd">-- | Look up a solved inert.</span></span>
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<pre style="margin: 0;"> <span id="LC2386" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSolvedDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC2387" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns just if exactly this predicate type exists in the solved.</span></span>
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<pre style="margin: 0;"> <span id="LC2388" class="line" lang="haskell"><span class="n" style="color: #333;">lookupSolvedDict</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IS</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_solved_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solved</span> <span class="p">})</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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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">@@ -2412,12 +2408,24 @@ foldIrreds k irreds z = foldr k z irreds</td>
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<pre style="margin: 0;"> <span id="LC2408" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2409" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Use loose types in inert set]</span></span>
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<pre style="margin: 0;"> <span id="LC2410" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC2415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Say we know (Eq (a |> c1)) and we need (Eq (a |> c2)). One is clearly</span></span>
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<pre style="margin: 0;">-<span id="LC2416" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solvable from the other. So, we do lookup in the inert set using</span></span>
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<pre style="margin: 0;">-<span id="LC2417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loose types, which omit the kind-check.</span></span>
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<pre style="margin: 0;">-<span id="LC2418" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must be careful when using the result of a lookup because it may</span></span>
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<pre style="margin: 0;">-<span id="LC2420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not match the requested info exactly!</span></span>
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2411
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<pre style="margin: 0;">+<span id="LC2411" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Whenever we are looking up an inert dictionary (CDictCan) or function</span></span>
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2412
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<pre style="margin: 0;">+<span id="LC2412" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equality (CFunEqCan), we use a TcAppMap, which uses the Unique of the</span></span>
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2413
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<pre style="margin: 0;">+<span id="LC2413" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">class/type family tycon and then a trie which maps the arguments. This</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2414" 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">
2414
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<pre style="margin: 0;">+<span id="LC2414" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">trie does *not* need to match the kinds of the arguments; this Note</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2415" 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">
2415
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<pre style="margin: 0;">+<span id="LC2415" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explains why.</span></span>
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2416
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<pre style="margin: 0;">+<span id="LC2416" class="line" lang="haskell"></span>
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2417
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<pre style="margin: 0;">+<span id="LC2417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider the types ty0 = (T ty1 ty2 ty3 ty4) and ty0' = (T ty1' ty2' ty3' ty4'),</span></span>
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2418
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<pre style="margin: 0;">+<span id="LC2418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where ty4 and ty4' have different kinds. Let's further assume that both types</span></span>
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2419
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<pre style="margin: 0;">+<span id="LC2419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ty0 and ty0' are well-typed. Because the kind of T is closed, it must be that</span></span>
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2420
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<pre style="margin: 0;">+<span id="LC2420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one of the ty1..ty3 does not match ty1'..ty3' (and that the kind of the fourth</span></span>
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2421
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<pre style="margin: 0;">+<span id="LC2421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument to T is dependent on whichever one changed). Since we are matching</span></span>
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2422
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<pre style="margin: 0;">+<span id="LC2422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all arguments, during the inert-set lookup, we know that ty1..ty3 do indeed</span></span>
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2423
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<pre style="margin: 0;">+<span id="LC2423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match ty1'..ty3'. Therefore, the kind of ty4 and ty4' must match, too --</span></span>
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2424
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<pre style="margin: 0;">+<span id="LC2424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">without ever looking at it.</span></span>
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2425
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<pre style="margin: 0;">+<span id="LC2425" class="line" lang="haskell"></span>
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2426
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<pre style="margin: 0;">+<span id="LC2426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Accordingly, we use LooseTypeMap, which skips the kind check when looking</span></span>
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2427
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<pre style="margin: 0;">+<span id="LC2427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">up a type. I (Richard E) believe this is just an optimization, and that</span></span>
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2428
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<pre style="margin: 0;">+<span id="LC2428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">looking at kinds would be harmless.</span></span>
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2421
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2429
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<pre style="margin: 0;"> <span id="LC2429" class="line" lang="haskell"></span>
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2422
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2430
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<pre style="margin: 0;"> <span id="LC2430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2423
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2431
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<pre style="margin: 0;"> <span id="LC2431" class="line" lang="haskell"></span>
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