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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Simon Peyton Jones pushed to branch wip/T22331
at <a href="https://gitlab.haskell.org/ghc/ghc" style="color: #1068bf; text-decoration: none;">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/634da448dd9296297eeb98f9552bc256b373a6f5" style="color: #1068bf; text-decoration: none;">634da448</a></strong>
<div>
<span>by Bodigrim</span>
<i>at 2022-11-03T21:25:02+00:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "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: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Fix haddocks for GHC.IORef
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/311251543f2e37af4a121e58028bfc46267a7fc9" style="color: #1068bf; text-decoration: none;">31125154</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2022-11-03T23:08:09-04:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "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: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Export pprTrace and friends from GHC.Prelude.
Introduces GHC.Prelude.Basic which can be used in modules which are a
dependency of the ppr code.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1834de0ed3fc4b8d2023c21e23463b16c9dbd17d" style="color: #1068bf; text-decoration: none;">1834de0e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2022-11-04T11:43:10+00:00</i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.8125rem; color: #303030; position: relative; font-family: "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: #fafafa; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dbdbdb;'>Fix decomposition of TyConApps
Ticket #22331 showed that we were being too eager to decompose
a Wanted TyConApp, leading to incompleteness in the solver.
To understand all this I ended up doing a substantial rewrite
of the old Note [Decomposing equalities], now reborn as
Note [Decomposing TyConApp equalities]. Plus rewrites of other
related Notes.
The actual fix is very minor and actually simplifies the code: in
`can_decompose` in `GHC.Tc.Solver.Canonical.canTyConApp`, we now call
`noMatchableIrreds`. A closely related refactor: we stop trying to
use the same "no matchable givens" function here as in
`matchClassInst`. Instead split into two much simpler functions.
</pre>
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<h4 style="margin-top: 10px; margin-bottom: 10px;">30 changed files:</h4>
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<a href="#56e23d78cfece2c83f03ed9b9a8ce9b20be26462" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Cmm/Expr.hs
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<a href="#5986ebaacfa99d264abfd2f7ef19d99a64db720f" style="color: #1068bf; text-decoration: none;">
compiler/GHC/CmmToAsm/BlockLayout.hs
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<a href="#76664ab267df4fc0bec2465efd78bf0afacfe3a7" style="color: #1068bf; text-decoration: none;">
compiler/GHC/CmmToC.hs
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<a href="#975dc08a8e7942b32d621f617d5a9c1b668601dd" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Coercion/Opt.hs
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Lint.hs
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<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/Arity.hs
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<a href="#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/ConstantFold.hs
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<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/DmdAnal.hs
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<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/OccurAnal.hs
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<a href="#cc763cdd1967f5d921161a32f64136cfcf0332c5" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/SetLevels.hs
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<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/Simplify.hs
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<a href="#ae6d91a5d028418bbf1431347d659e744e0a3128" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/Simplify/Iteration.hs
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<a href="#48fbb5cdea308650de5756521feb28ec68819b9b" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/Simplify/Utils.hs
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compiler/GHC/Core/Opt/SpecConstr.hs
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<a href="#ab22d7ae4d245581b701367e386d7e886e416e76" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/Specialise.hs
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<a href="#5b215b0e109123e4bef5434854f18e2f61c45b88" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/WorkWrap.hs
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<a href="#f4421b4e35592648510c877ecf55b1af2b96dcee" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/Opt/WorkWrap/Utils.hs
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compiler/GHC/Core/Rules.hs
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compiler/GHC/Core/Tidy.hs
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<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Core/TyCon.hs
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compiler/GHC/Core/Utils.hs
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<a href="#bbf06eb5d4f0db7bc3213b84b9f5822710ff7be8" style="color: #1068bf; text-decoration: none;">
compiler/GHC/CoreToIface.hs
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<a href="#d79a8a61508cb6c5f38a23ab2b691bb77306f672" style="color: #1068bf; text-decoration: none;">
compiler/GHC/CoreToStg.hs
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<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a" style="color: #1068bf; text-decoration: none;">
compiler/GHC/CoreToStg/Prep.hs
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<a href="#53922902dfbcf07bd64cf051e8389508ef98ab71" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Data/Bool.hs
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<a href="#a8f3bfe37f170a214ee916678e420a909dd1fa0a" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Data/FastMutInt.hs
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compiler/GHC/Data/FastString.hs
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<a href="#7d5c4067d35a03e35a4cca5354d5d55924822d4f" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Data/List/SetOps.hs
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<a href="#3b4a348959abd9d6cf552e6b740baadea76d9da5" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Driver/Config/StgToCmm.hs
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<a href="#c7700b61eaeb27e90fb2f1acc6cfd53ddaa4d690" style="color: #1068bf; text-decoration: none;">
compiler/GHC/Driver/Env.hs
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<h5 style="margin-top: 10px; margin-bottom: 10px; font-size: 0.875rem;">The diff was not included because it is too large.</h5>
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