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<div class="content">
<h3 style="margin-top: 20px; margin-bottom: 10px;">
Ryan Scott pushed to branch wip/T22696 at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<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/e0b8eaf3fc3d2ebbdcc86610b889930dbe5b4cdb">e0b8eaf3</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-03-22T09:50:13+00:00 </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;'>Refactor the constraint solver pipeline
The big change is to put the entire type-equality solver into
GHC.Tc.Solver.Equality, rather than scattering it over Canonical
and Interact. Other changes
* EqCt becomes its own data type, a bit like QCInst. This is
great because EqualCtList is then just [EqCt]
* New module GHC.Tc.Solver.Dict has come of the class-contraint
solver. In due course it will be all. One step at a time.
This MR is intended to have zero change in behaviour: it is a
pure refactor. It opens the way to subsequent tidying up, we
believe.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cedf9a3b7a74a7c1c09e8b994edc40a2447dae08">cedf9a3b</a></strong>
<div>
<span> by Torsten Schmits </span> <i> at 2023-03-22T15:31:18-04:00 </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;'>Add structured error messages for GHC.Tc.Utils.TcMType
Tracking ticket: #20119
MR: !10138
This converts uses of `mkTcRnUnknownMessage` to newly added constructors
of `TcRnMessage`.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30d45e971d94b3c28296a3f20f94275f38bc89d1">30d45e97</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-03-22T15:32:01-04:00 </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: use js_skip for T2615 (#22374)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c98deba9a0b8136f858ecc5d7a6948dcf60820e">8c98deba</a></strong>
<div>
<span> by Armando Ramirez </span> <i> at 2023-03-23T09:19:32-04:00 </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;'>Optimized Foldable methods for Data.Functor.Compose
Explicitly define length, elem, etc. in Foldable instance for Data.Functor.Compose
Implementation of https://github.com/haskell/core-libraries-committee/issues/57
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc0661081aa9c61cc031546cf2b7d58f46a4f5be">bc066108</a></strong>
<div>
<span> by Armando Ramirez </span> <i> at 2023-03-23T09:19:32-04:00 </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;'>Additional optimized versions
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/80fce576d001a6a1182d426020349e496b179496">80fce576</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-03-23T09:19:32-04:00 </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;'>Simplify minimum/maximum in instance Foldable (Compose f g)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cb88a5ade9427ca2f26e7f2dbf9defb8fb0ed22">8cb88a5a</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-03-23T09:19:32-04:00 </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;'>Update changelog to mention changes to instance Foldable (Compose f g)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1c8c41d62854553d889403d8ee52d120c26bc66">e1c8c41d</a></strong>
<div>
<span> by Torsten Schmits </span> <i> at 2023-03-23T09:20:13-04:00 </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;'>Add structured error messages for GHC.Tc.TyCl.PatSyn
Tracking ticket: #20117
MR: !10158
This converts uses of `mkTcRnUnknownMessage` to newly added constructors
of `TcRnMessage`.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f932c5890ec358aa0cbba547eb6982168e13da37">f932c589</a></strong>
<div>
<span> by Adam Gundry </span> <i> at 2023-03-24T02:36:09-04:00 </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;'>Allow WARNING pragmas to be controlled with custom categories
Closes #17209. This implements GHC Proposal 541, allowing a WARNING
pragma to be annotated with a category like so:
{-# WARNING in "x-partial" head "This function is undefined on empty lists." #-}
The user can then enable, disable and set the severity of such warnings
using command-line flags `-Wx-partial`, `-Werror=x-partial` and so on. There
is a new warning group `-Wextended-warnings` containing all these warnings.
Warnings without a category are treated as if the category was `deprecations`,
and are (still) controlled by the flags `-Wdeprecations`
and `-Wwarnings-deprecations`.
Updates Haddock submodule.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0426515be8836acfdde7ddc9cf35a99a7a73f278">0426515b</a></strong>
<div>
<span> by Adam Gundry </span> <i> at 2023-03-24T02:36:09-04:00 </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;'>Move mention of warning groups change to 9.8.1 release notes
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8d783d24b9a617ad1e3038abeb75d322703ef65">b8d783d2</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2023-03-24T02:36:45-04:00 </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;'>nativeGen/AArch64: Fix bitmask immediate predicate
Previously the predicate for determining whether a logical instruction
operand could be encoded as a bitmask immediate was far too
conservative. This meant that, e.g., pointer untagged required five
instructions whereas it should only require one.
Fixes #23030.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/46120bb637452be6e16e5dd7091c0b469a5adcd5">46120bb6</a></strong>
<div>
<span> by Joachim Breitner </span> <i> at 2023-03-24T13:09:43-04:00 </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;'>User's guide: Improve docs for -Wall
previously it would list the warnings _not_ enabled by -Wall. That’s
unnecessary round-about and was out of date. So let's just name
the relevant warnings (based on `compiler/GHC/Driver/Flags.hs`).
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/509d1f11bf4e7eb4b916ae1c33abc48047b3be0e">509d1f11</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2023-03-24T13:10:20-04:00 </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;'>codeGen/tsan: Disable instrumentation of unaligned stores
There is some disagreement regarding the prototype of
`__tsan_unaligned_write` (specifically whether it takes just the written
address, or the address and the value as an argument). Moreover, I have
observed crashes which appear to be due to it. Disable instrumentation
of unaligned stores as a temporary mitigation.
Fixes #23096.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cc1ddb273c47c07b1835b82c674355e51e2ae23">5cc1ddb2</a></strong>
<div>
<span> by Ryan Scott </span> <i> at 2023-03-24T18:17:54-04:00 </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;'>validDerivPred: Reject non-type-variable constraints in IrredPreds
This brings the `IrredPred` case in sync with the general wisdom in `Note
[Exotic derived instance contexts]`. Namely, we should reject arbitrarily
complex constraints that are inferred from `deriving` clauses. This has the
nice property that `deriving` clauses whose inferred instance context mention
`TypeError` will now emit the type error in the resulting error message, which
better matches existing intuitions about how `TypeError` should work.
This changes the behavior of `deriving` in a way that existing code might
break, so I have made a mention of this in the GHC User's Guide. It seems very,
very unlikely that much code is relying on this strange behavior, however, and
even if it is, there is a clear migration path using `StandaloneDeriving`.
Fixes #22696.
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
18 changed files:
</h4>
<ul>
<li class="file-stats">
<a href="#194e2602b82bb08fd31c3028aace1da113aae36f">
compiler/GHC/Cmm/ThreadSanitizer.hs
</a>
</li>
<li class="file-stats">
<a href="#6997a0cd37829d3d08db1c48185aaa3d7dfc3e6b">
compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
</a>
</li>
<li class="file-stats">
<a href="#2fefe3125c649bc5377b06a7cca18e785855b79c">
compiler/GHC/Data/Bag.hs
</a>
</li>
<li class="file-stats">
<a href="#c786816bca5e182a02da23ebd34ff8563b35e55a">
compiler/GHC/Driver/Config/Diagnostic.hs
</a>
</li>
<li class="file-stats">
<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
</a>
</li>
<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
</a>
</li>
<li class="file-stats">
<a href="#75bfcd03f3ba9315d33104fcb0424c6bfeb4e334">
compiler/GHC/Hs/Decls.hs
</a>
</li>
<li class="file-stats">
<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
</a>
</li>
<li class="file-stats">
<a href="#bc838fed116397de81c10f0a33433e07c6d3a2d4">
compiler/GHC/Parser/HaddockLex.x
</a>
</li>
<li class="file-stats">
<a href="#86d694037d496c511e28b2c09c8410f67dc19596">
compiler/GHC/Rename/Env.hs
</a>
</li>
<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
</a>
</li>
<li class="file-stats">
<a href="#e05ee69330b0f7088f11a5f3567137547489664d">
compiler/GHC/Rename/Names.hs
</a>
</li>
<li class="file-stats">
<a href="#1e112461bfd65ab9492f37fe37931c1d5ddc5c26">
compiler/GHC/Tc/Deriv/Infer.hs
</a>
</li>
<li class="file-stats">
<a href="#1dd9c7a6bbc222c976a6ec1c4b772232ae60f7e5">
compiler/GHC/Tc/Errors/Ppr.hs
</a>
</li>
<li class="file-stats">
<a href="#cdba811872892f235fe7059df1a6c538fba60816">
compiler/GHC/Tc/Errors/Types.hs
</a>
</li>
<li class="file-stats">
<a href="#73cf7ada7d008f315e18676ed83f3a566fbbe679">
compiler/GHC/Tc/Gen/Export.hs
</a>
</li>
<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
</a>
</li>
<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
</a>
</li>
</ul>
<h5 style="margin-top: 10px; margin-bottom: 10px; font-size: 0.875rem;">
The diff was not included because it is too large.
</h5>
</div>
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