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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/57609069ed365114b38487c97706f3151064b1fa">57609069</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-25T15:00:36-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve comments
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<h4>5 changed files:</h4>
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57609069ed365114b38487c97706f3151064b1fa#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3939" 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">@@ -3939,6 +3939,8 @@ more. So I use a HACK:</td>
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3939
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<pre style="margin: 0;"> <span id="LC3939" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Result works fine, but it may eventually bite us.</span></span>
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3941
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3941
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<pre style="margin: 0;"> <span id="LC3941" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Do not simplify ConstraintHoles] in GHC.Tc.Solver for</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3943" 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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<pre style="margin: 0;">+<span id="LC3943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">information about how these are printed.</span></span>
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<pre style="margin: 0;"> <span id="LC3944" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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3944
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<pre style="margin: 0;"> <span id="LC3946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57609069ed365114b38487c97706f3151064b1fa#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -2120,7 +2120,8 @@ the example for why (partial-sigs/should_compile/T12844):</td>
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2120
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC correctly infers that the extra-constraints wildcard on `bar`</span></span>
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<pre style="margin: 0;"> <span id="LC2122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should be (Head rngs ~ '(r, r'), Foo rngs). It then adds this constraint</span></span>
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2123
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<pre style="margin: 0;">-<span id="LC2123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as a Given on the implication constraint for `bar`. The Hole for</span></span>
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<pre style="margin: 0;">+<span id="LC2123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as a Given on the implication constraint for `bar`. (This implication is</span></span>
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<pre style="margin: 0;">+<span id="LC2124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">created by mkResidualConstraints in simplifyInfer.) The Hole for</span></span>
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<pre style="margin: 0;"> <span id="LC2125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the _ is stored within the implication's WantedConstraints.</span></span>
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<pre style="margin: 0;"> <span id="LC2126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When simplifyHoles is called, that constraint is already assumed as</span></span>
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<pre style="margin: 0;"> <span id="LC2127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a Given. Simplifying with respect to it turns it into</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2136" 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">@@ -2135,6 +2136,9 @@ is simple: just don't simplify extra-constraints wildcards.</td>
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<pre style="margin: 0;"> <span id="LC2136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is the only reason we need to track ConstraintHole separately</span></span>
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<pre style="margin: 0;"> <span id="LC2137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from TypeHole in HoleSort.</span></span>
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2137
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2138
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<pre style="margin: 0;"> <span id="LC2138" class="line" lang="haskell"></span>
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2139
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<pre style="margin: 0;">+<span id="LC2139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Extra-constraint holes in partial type signatures]</span></span>
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2140
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<pre style="margin: 0;">+<span id="LC2140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Tc.Gen.HsType.</span></span>
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2141
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<pre style="margin: 0;">+<span id="LC2141" class="line" lang="haskell"></span>
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2138
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2142
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<pre style="margin: 0;"> <span id="LC2142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Tracking redundant constraints]</span></span>
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2139
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2143
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<pre style="margin: 0;"> <span id="LC2143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2140
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2144
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<pre style="margin: 0;"> <span id="LC2144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With Opt_WarnRedundantConstraints, GHC can report which</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57609069ed365114b38487c97706f3151064b1fa#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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">@@ -2524,38 +2524,39 @@ Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must be sure to kick out any such CIrredCan constraints that mention coercion holes</span></span>
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when those holes get filled in, so that the unification step can now proceed.</span></span>
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2a) We must now kick out any constraints that mention a newly-filled-in</span></span>
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> coercion hole, but only if there are no more remaining coercion</span></span>
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<pre style="margin: 0;">-<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> holes. This is done in kickOutAfterFillingCoercionHole. The extra</span></span>
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check that there are no more remaining holes avoids needless work</span></span>
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when rewriting evidence (which fills coercion holes) and aids</span></span>
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<pre style="margin: 0;">-<span id="LC2532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> efficiency.</span></span>
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<pre style="margin: 0;">-<span id="LC2533" class="line" lang="haskell"></span>
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2534
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<pre style="margin: 0;">-<span id="LC2534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Moreover, kicking out when there are remaining unfilled holes can</span></span>
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cause a loop in the solver in this case:</span></span>
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w1 :: (ty1 :: F a) ~ (ty2 :: s)</span></span>
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2537
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<pre style="margin: 0;">-<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> After canonicalisation, we discover that this equality is heterogeneous.</span></span>
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2538
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<pre style="margin: 0;">-<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we emit</span></span>
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2539
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<pre style="margin: 0;">-<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abc :: F a ~ s</span></span>
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2540
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<pre style="margin: 0;">-<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and preserve the original as</span></span>
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2541
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w2 :: (ty1 |> co_abc) ~ ty2 (blocked on co_abc)</span></span>
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2542
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<pre style="margin: 0;">-<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then, co_abc comes becomes the work item. It gets swapped in</span></span>
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2543
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<pre style="margin: 0;">-<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> canEqCanLHS2 and then back again in canEqTyVarFunEq. We thus get</span></span>
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2544
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<pre style="margin: 0;">-<span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co_abc := sym co_abd, and then co_abd := sym co_abe, with</span></span>
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2545
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<pre style="margin: 0;">-<span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abe :: F a ~ s</span></span>
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2546
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<pre style="margin: 0;">-<span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This process has filled in co_abc. Suppose w2 were kicked out.</span></span>
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2547
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<pre style="margin: 0;">-<span id="LC2547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> When it gets processed,</span></span>
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2548
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<pre style="margin: 0;">-<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> would get this whole chain going again. The solution is to</span></span>
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2549
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<pre style="margin: 0;">-<span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kick out a blocked constraint only when the result of filling</span></span>
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2550
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<pre style="margin: 0;">-<span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the blocking coercion involves no further blocking coercions.</span></span>
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2551
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<pre style="margin: 0;">-<span id="LC2551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Alternatively, we could be careful not to do unnecessary swaps during</span></span>
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2552
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<pre style="margin: 0;">-<span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> canonicalisation, but that seems hard to do, in general.</span></span>
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2527
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<pre style="margin: 0;">+<span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The kicking out is done in kickOutAfterFillingCoercionHole.</span></span>
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2528
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"></span>
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2529
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, we must be careful: we kick out only when no coercion holes are</span></span>
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2530
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> left. The holes in the type are stored in the BlockedCIS CtIrredStatus.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2531" 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">
2531
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The extra check that there are no more remaining holes avoids</span></span>
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2532
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> needless work when rewriting evidence (which fills coercion holes) and</span></span>
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2533
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aids efficiency.</span></span>
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2534
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<pre style="margin: 0;">+<span id="LC2534" class="line" lang="haskell"></span>
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2535
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Moreover, kicking out when there are remaining unfilled holes can</span></span>
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2536
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cause a loop in the solver in this case:</span></span>
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2537
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<pre style="margin: 0;">+<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w1 :: (ty1 :: F a) ~ (ty2 :: s)</span></span>
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2538
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> After canonicalisation, we discover that this equality is heterogeneous.</span></span>
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2539
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<pre style="margin: 0;">+<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we emit</span></span>
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2540
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<pre style="margin: 0;">+<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abc :: F a ~ s</span></span>
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2541
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<pre style="margin: 0;">+<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and preserve the original as</span></span>
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2542
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w2 :: (ty1 |> co_abc) ~ ty2 (blocked on co_abc)</span></span>
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2543
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<pre style="margin: 0;">+<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then, co_abc comes becomes the work item. It gets swapped in</span></span>
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2544
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<pre style="margin: 0;">+<span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> canEqCanLHS2 and then back again in canEqTyVarFunEq. We thus get</span></span>
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2545
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<pre style="margin: 0;">+<span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co_abc := sym co_abd, and then co_abd := sym co_abe, with</span></span>
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2546
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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abe :: F a ~ s</span></span>
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2547
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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This process has filled in co_abc. Suppose w2 were kicked out.</span></span>
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2548
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> When it gets processed,</span></span>
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2549
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<pre style="margin: 0;">+<span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> would get this whole chain going again. The solution is to</span></span>
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2550
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<pre style="margin: 0;">+<span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kick out a blocked constraint only when the result of filling</span></span>
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2551
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<pre style="margin: 0;">+<span id="LC2551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the blocking coercion involves no further blocking coercions.</span></span>
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2552
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<pre style="margin: 0;">+<span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Alternatively, we could be careful not to do unnecessary swaps during</span></span>
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2553
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<pre style="margin: 0;">+<span id="LC2553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> canonicalisation, but that seems hard to do, in general.</span></span>
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2553
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2554
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<pre style="margin: 0;"> <span id="LC2554" class="line" lang="haskell"></span>
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2554
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2555
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<pre style="margin: 0;"> <span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (3) Suppose we have [W] (a :: k1) ~ (rhs :: k2). We duly follow the</span></span>
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2555
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2556
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<pre style="margin: 0;"> <span id="LC2556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> algorithm detailed here, producing [W] co :: k2 ~ k1, and adding</span></span>
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2556
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2557
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<pre style="margin: 0;"> <span id="LC2557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] (a :: k1) ~ ((rhs |> co) :: k1) to the irreducibles. Some time</span></span>
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2557
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2558
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<pre style="margin: 0;"> <span id="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> later, we solve co, and fill in co's coercion hole. This kicks out</span></span>
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2558
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<pre style="margin: 0;">-<span id="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the irreducible as described in (2<span class="idiff left right">a</span>).</span></span>
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2559
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<pre style="margin: 0;">+<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the irreducible as described in (2).</span></span>
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2559
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2560
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<pre style="margin: 0;"> <span id="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But now, during canonicalization, we see the cast</span></span>
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<pre style="margin: 0;"> <span id="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and remove it, in canEqCast. By the time we get into canEqCanLHS, the equality</span></span>
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<pre style="margin: 0;"> <span id="LC2562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is heterogeneous again, and the process repeats.</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">@@ -2832,9 +2833,10 @@ Details:</td>
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<pre style="margin: 0;"> <span id="LC2833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> they originally stood for (e.g. cbv1 := TF a, cbv2 := TF Int),</span></span>
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<pre style="margin: 0;"> <span id="LC2834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not what may be in a rewritten constraint.</span></span>
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<pre style="margin: 0;"> <span id="LC2835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Not breaking cycles fursther makes sense, because</span></span>
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<pre style="margin: 0;">-<span id="LC2836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we only want to break cycles for user-written loopy Givens, and</span></span>
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<pre style="margin: 0;">-<span id="LC2837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a CycleBreakerTv certainly isn't user-written.</span></span>
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<pre style="margin: 0;">+<span id="LC2836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Not breaking cycles further (which would mean changing TF cbv1 to cbv3</span></span>
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<pre style="margin: 0;">+<span id="LC2837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and TF cbv2 to cbv4) makes sense, because we only want to break cycles</span></span>
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<pre style="margin: 0;">+<span id="LC2838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for user-written loopy Givens, and a CycleBreakerTv certainly isn't</span></span>
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<pre style="margin: 0;">+<span id="LC2839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> user-written.</span></span>
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<pre style="margin: 0;"> <span id="LC2840" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: This same situation (an equality like b ~ Maybe (F b)) can arise with</span></span>
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<pre style="margin: 0;"> <span id="LC2842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wanteds, but we have no concrete case incentivising special treatment. It</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">@@ -1817,7 +1817,7 @@ kickOutAfterUnification new_tv</td>
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<pre style="margin: 0;"> <span id="LC1817" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setInertCans</span> <span class="n" style="color: #333;">ics2</span></span>
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<pre style="margin: 0;"> <span id="LC1818" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">n_kicked</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Wrinkle (2<span class="idiff left right">a</span>) in Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical</span></span>
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Wrinkle (2) in Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical</span></span>
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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"><span class="n" style="color: #333;">kickOutAfterFillingCoercionHole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC1822" class="line" lang="haskell"><span class="n" style="color: #333;">kickOutAfterFillingCoercionHole</span> <span class="n" style="color: #333;">hole</span> <span class="n" style="color: #333;">filled_co</span></span>
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<pre style="margin: 0;"> <span id="LC1823" 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;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57609069ed365114b38487c97706f3151064b1fa#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -298,7 +298,7 @@ data CtIrredStatus</td>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSet</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this constraint is blocked on the coercion hole(s) listed</span></span>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical</span></span>
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<pre style="margin: 0;">-<span id="LC301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Wrinkle (4a). Why store the HoleSet? See Wrinkle (2<span class="idiff left right">a</span>) of that</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Wrinkle (4a). Why store the HoleSet? See Wrinkle (2) of that</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- same Note.</span></span>
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<pre style="margin: 0;"> <span id="LC303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- INVARIANT: A BlockedCIS is a homogeneous equality whose</span></span>
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<pre style="margin: 0;"> <span id="LC304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- left hand side can fit in a CanEqLHS.</span></span>
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