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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Vladislav Zavialov pushed to branch wip/forall-vis-coercions 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/bc25bdc6b3224efd2f67005ed62f584324406da0">bc25bdc6</a></strong>
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<span> by Matthew Craven </span> <i> at 2023-06-16T20:14:54+02:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.875rem; color: #333238; position: relative; font-family: var(--default-mono-font, "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;'>Equality of forall-types is visiblity aware
This patch finally (I hope) nails the question of whether
(forall a. ty) and (forall a -> ty)
are `eqType`: they aren't!
There is a long discussion in #22762, plus useful Notes:
* Note [ForAllTy and type equality] in GHC.Core.TyCo.Compare
* Note [Comparing visiblities] in GHC.Core.TyCo.Compare
* Note [Forall coercions] in GHC.Core.TyCo.Rep
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30 changed files:
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<a href="#b0ab2032bd0c006bb9cda1e5433173de35930f53">
compiler/GHC/Core/Coercion.hs-boot
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<a href="#975dc08a8e7942b32d621f617d5a9c1b668601dd">
compiler/GHC/Core/Coercion/Opt.hs
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compiler/GHC/Core/FVs.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
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compiler/GHC/Core/Reduction.hs
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compiler/GHC/Core/TyCo/Compare.hs
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compiler/GHC/Core/TyCo/FVs.hs
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compiler/GHC/Core/TyCo/Rep.hs
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compiler/GHC/Core/TyCo/Subst.hs
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compiler/GHC/Core/TyCo/Tidy.hs
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compiler/GHC/Core/Type.hs
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compiler/GHC/Core/Unify.hs
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compiler/GHC/Core/Utils.hs
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compiler/GHC/CoreToIface.hs
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compiler/GHC/Iface/Rename.hs
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compiler/GHC/Iface/Syntax.hs
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compiler/GHC/Iface/Type.hs
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<a href="#06ff7bac58fd8cfe0c17b81963b03f4cce86a065">
compiler/GHC/IfaceToCore.hs
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<a href="#03ec4f8741105271af29a61fdb47c8feba9bbcfa">
compiler/GHC/Tc/Solver/Equality.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#5ed3ecf19a26af612b8100b2639f8e153f580fe9">
compiler/GHC/Tc/TyCl/Utils.hs
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compiler/GHC/Tc/Utils/TcMType.hs
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<a href="#5dac619989e8509003cf7b463c100f5cc56072a3">
compiler/GHC/Types/Var.hs
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testsuite/tests/cpranal/should_compile/T18174.stderr
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testsuite/tests/cpranal/should_compile/T18401.stderr
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<a href="#bdfe4555cbb15b1c7257f72c3ed24abf17a788eb">
testsuite/tests/pmcheck/should_compile/T11195.hs
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testsuite/tests/simplCore/should_compile/OpaqueNoCastWW.stderr
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<a href="#90dbe47e56170fb2eae4fbbd8889a1b4af061f9e">
testsuite/tests/simplCore/should_compile/T8331.stderr
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The diff was not included because it is too large.
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