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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Andrei Borzenkov 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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<h4 style="margin-top: 10px; margin-bottom: 10px;">
Commits:
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<ul>
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<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be84c48d2efe68fe74d53982d9ae2d0b7f6e9c92">be84c48d</a></strong>
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<span> by Andrei Borzenkov </span> <i> at 2023-12-14T17:53:51+04:00 </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.
We have to accept SigmaType in matchExpectedFunTys function
to implement them. To achieve that, I made skolemization more
lazy. This leads to
- Changing tcPolyCheck function. Now it collects skolemised
type variables and passes a list of them into tc_match_fun,
so they could be used as [ExpPatType] with @-binsers.
- Changing tcExprSig function, so now it only skolemises signature
if there is `ScopedTypeVariables` extension enabled.
- Changing tcPolyExpr function. Now it goes deeper into type if type
actually is
1) HsPar
2) HsLam
In all other cases tcPolyExpr immediately skolemises a type as it was
previously.
These changes would allow lambdas to accept invisible type arguments
in the most interesting contexts.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6b004cc04ac7c2ecd5a8aeeca7028e8d9460782">d6b004cc</a></strong>
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<span> by Andrei Borzenkov </span> <i> at 2023-12-14T17:57:29+04:00 </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;'>fixup! Lazy skolemisation for @a-binders (17594)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b53bd98d10e731c11446e80bf6dce5f94bde860">1b53bd98</a></strong>
<div>
<span> by Andrei Borzenkov </span> <i> at 2023-12-14T18:00:07+04:00 </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;'>Use flag instead of [ExpPatTy]
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<h4 style="margin-top: 10px; margin-bottom: 10px;">
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compiler/GHC/Core/TyCo/Rep.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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compiler/GHC/Tc/Gen/Pat.hs
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