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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Simon Peyton Jones 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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<h4 style="margin-top: 10px; margin-bottom: 10px;">
Commits:
</h4>
<ul>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62c5641679b38ecf1978da890e084ef435255903">62c56416</a></strong>
<div>
<span> by Ben Price </span> <i> at 2023-06-16T05:52:39-04:00 </i>
</div>
<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;'>Lint: more details on "Occurrence is GlobalId, but binding is LocalId"
This is helpful when debugging a pass which accidentally shadowed a
binder.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d4c102387ee23c805fa07bb394df12dd0206fc94">d4c10238</a></strong>
<div>
<span> by Ryan Hendrickson </span> <i> at 2023-06-16T05:53:22-04:00 </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;'>Clean a stray bit of text in user guide
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93647b5cdc94532bd436c0076de64412f305011a">93647b5c</a></strong>
<div>
<span> by Vladislav Zavialov </span> <i> at 2023-06-16T05:54:02-04:00 </i>
</div>
<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;'>testsuite: Add forall visibility test cases
The added tests ensure that the type checker does not confuse
visible and invisible foralls.
VisFlag1: kind-checking type applications and inferred type variable instantiations
VisFlag1_ql: kind-checking Quick Look instantiations
VisFlag2: kind-checking type family instances
VisFlag3: checking kind annotations on type parameters of associated type families
VisFlag4: checking kind annotations on type parameters in type declarations with SAKS
VisFlag5: checking the result kind annotation of data family instances
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6e5518777b529924011e3dc58510b5fea78edc9">c6e55187</a></strong>
<div>
<span> by Matthew Craven </span> <i> at 2023-06-16T12:28:25+01:00 </i>
</div>
<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
</pre>
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<h4 style="margin-top: 10px; margin-bottom: 10px;">
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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<a href="#448d7f6e0151c2014de38dead3a902f511c45b75">
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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<a href="#39b77c6bc34fc853a50f4c1ba3598e2f026625c6">
compiler/GHC/Core/Reduction.hs
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<a href="#f12e69f869289252159b0af74c2a0b72b429ab3a">
compiler/GHC/Core/TyCo/Compare.hs
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compiler/GHC/Core/TyCo/FVs.hs
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<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
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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compiler/GHC/IfaceToCore.hs
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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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<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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compiler/GHC/Types/Var.hs
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<a href="#8f9c20f24552f57f5ce51c93144fd731ad897a11">
docs/users_guide/exts/infix_tycons.rst
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<a href="#9b7f3c4da9ed85be1a5417353ef7e1c1b9314965">
testsuite/tests/cpranal/should_compile/T18174.stderr
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<a href="#782a0e6faf0eada0a94e75ce3b5bd4bd55192a3d">
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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The diff was not included because it is too large.
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