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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Simon Peyton Jones pushed to branch wip/sand-witch/lazy-skol at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9131d1b4908a8a6597c63f0f437f23bd401b041a">9131d1b4</a></strong>
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<span> by Andrei Borzenkov </span> <i> at 2024-01-31T21:32:32+00:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Lazy skolemisation for @a-binders (#17594)
This patch is a preparation for @a-binders implementation. The main changes are:
* Skolemisation is now prepared to deal with @binders.
See Note [Skolemisation overview] in GHC.Tc.Utils.Unify.
Most of the action is in
- Utils.Unify.matchExpectedFunTys
- Gen.Pat.tcMatchPats
- Gen.Expr.tcPolyExprCheck
- Gen.Binds.tcPolyCheck
Some significant accompanying refactoring
* Quite a bit of renaming, e.g.
tcMatchesCase --> tcCaseMatches
tcMatchesFun --> tcFunBindMatches
tcPats --> tcMatchPats
matchActualFunTysRho --> matchActualFunTys
matchActualFunTySigma --> matchActualFunTy
* Split GHC.Tc.Type.BasicTypes.TcSigInfo so that TcCompleteSig (describing
a complete user-supplied signature) is its own data type.
Fewer "panic" cases!
* Make Language.Haskell.Syntax.Expr.HsMatchContext be parameterised
over the function itself, rather than over the pass. See
Note [mc_fun field of FunRhs] in that module.
* Remove the HsMatchContext field of TcMatchCtxt; and then kill off the latter entirely.
Instead get the HsMatchContext from the Match being typechecked. Simpler.
* I found that funTyConAppTy_maybe was doing a lot of allocation, and
rejigged userTypeError_maybe to avoid calling it.
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compiler/GHC/Core/Make.hs
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compiler/GHC/Core/TyCo/Rep.hs
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compiler/GHC/Core/Type.hs
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compiler/GHC/Hs/Expr.hs
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compiler/GHC/Hs/Instances.hs
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compiler/GHC/HsToCore/Utils.hs
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compiler/GHC/Rename/Bind.hs
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compiler/GHC/Rename/Env.hs
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compiler/GHC/Rename/Pat.hs
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compiler/GHC/Tc/Deriv/Functor.hs
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compiler/GHC/Tc/Errors/Ppr.hs
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compiler/GHC/Tc/Errors/Types.hs
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compiler/GHC/Tc/Gen/App.hs
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compiler/GHC/Tc/Gen/Bind.hs
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compiler/GHC/Tc/Gen/Expr.hs
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compiler/GHC/Tc/Gen/Expr.hs-boot
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