<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html lang="en" style='--code-editor-font: var(--default-mono-font, "GitLab Mono"), JetBrains Mono, Menlo, DejaVu Sans Mono, Liberation Mono, Consolas, Ubuntu Mono, Courier New, andale mono, lucida console, monospace;'>
<head>
<meta content="text/html; charset=US-ASCII" http-equiv="Content-Type">
<title>
GitLab
</title>
<style data-premailer="ignore" type="text/css">
a { color: #1068bf; }
</style>
<style>img {
max-width: 100%; height: auto;
}
body {
font-size: 0.875rem;
}
body {
-webkit-text-shadow: rgba(255,255,255,0.01) 0 0 1px;
}
body {
font-family: var(--default-regular-font, "GitLab Sans"),-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans",Ubuntu,Cantarell,"Helvetica Neue",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji"; font-size: inherit;
}
</style>
</head>
<body style='font-size: inherit; -webkit-text-shadow: rgba(255,255,255,0.01) 0 0 1px; font-family: var(--default-regular-font, "GitLab Sans"),-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans",Ubuntu,Cantarell,"Helvetica Neue",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";'>
<div class="content">
<h3 style="margin-top: 20px; margin-bottom: 10px;">
Simon Peyton Jones pushed to branch wip/T24335 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/eaf8a06de671f4d31124ac3869a473753686a50b">eaf8a06d</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2024-01-11T00:43:17+01:00 </i>
</div>
<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;'>Turn -Wtype-equality-out-of-scope on by default
Also remove -Wnoncanonical-{monoid,monad}-instances from -Wcompat,
since they are enabled by default. Refresh wcompat-warnings/ test
with new -Wcompat warnings.
Part of #24267
Co-authored-by: sheaf <sam.derbyshire@gmail.com>
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42bee5aa6ed22cd2f4786934c25363a94f77aad5">42bee5aa</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-01-12T21:16:21-05:00 </i>
</div>
<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;'>Arity: Require called *exactly once* for eta exp with -fpedantic-bottoms (#24296)
In #24296, we had a program in which we eta expanded away an error despite the
presence of `-fpedantic-bottoms`.
This was caused by turning called *at least once* lambdas into one-shot lambdas,
while with `-fpedantic-bottoms` it is only sound to eta expand over lambdas that
are called *exactly* once.
An example can be found in `Note [Combining arity type with demand info]`.
Fixes #24296.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e95f738620dc805868d198f980e1bdd53e27a2d">7e95f738</a></strong>
<div>
<span> by Andreas Klebinger </span> <i> at 2024-01-12T21:16:57-05:00 </i>
</div>
<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;'>Aarch64: Enable -mfma by default.
Fixes #24311
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e43788d07a59cad559aea443dec1c701f93107e6">e43788d0</a></strong>
<div>
<span> by Jason Shipman </span> <i> at 2024-01-14T12:47:38-05:00 </i>
</div>
<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;'>Add more instances for Compose: Fractional, RealFrac, Floating, RealFloat
CLC proposal #226 https://github.com/haskell/core-libraries-committee/issues/226
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae6d8cd2771ffa8022a60a6e1ed7b07d073d33e6">ae6d8cd2</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-01-14T12:48:15-05:00 </i>
</div>
<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;'>Pmc: COMPLETE pragmas associated with Family TyCons should apply to representation TyCons as well (#24326)
Fixes #24326.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5fc7304d56c7a1e0a7bc6e53e23b976772fc10e">c5fc7304</a></strong>
<div>
<span> by sheaf </span> <i> at 2024-01-15T14:15:29-05:00 </i>
</div>
<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 lookupOccRn_maybe in TH.lookupName
When looking up a value, we want to be able to find both variables
and record fields. So we should not use the lookupSameOccRn_maybe
function, as we can't know ahead of time which record field namespace
a record field with the given textual name will belong to.
Fixes #24293
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da908790670cd5161cffc3d83757fb8048bdafda">da908790</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2024-01-15T14:16:05-05:00 </i>
</div>
<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;'>Make the build more strict on documentation errors
* Detect undefined labels. This can be tested by adding :ref:`nonexistent`
to a documentation rst file; attempting to build docs will fail.
Fixed the undefined label in `9.8.1-notes.rst`.
* Detect errors. While we have plenty of warnings, we can at least enforce
that Sphinx does not report errors.
Fixed the error in `required_type_arguments.rst`.
Unrelated change: I have documented that the `-dlint` enables
`-fcatch-nonexhaustive-cases`, as can be verified by checking
`enableDLint`.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5077416e12cf480fb2048928aa51fa4c8fc22cf1">5077416e</a></strong>
<div>
<span> by Javier Sagredo </span> <i> at 2024-01-16T15:40:06-05:00 </i>
</div>
<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;'>Profiling: Adds an option to not start time profiling at startup
Using the functionality provided by
d89deeba47ce04a5198a71fa4cbc203fe2c90794, this patch creates a new rts
flag `--no-automatic-time-samples` which disables the time profiling
when starting a program. It is then expected that the user starts it
whenever it is needed.
Fixes #24337
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5776008c7a5581193c3e72e59451ad49abac9d81">5776008c</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-01-16T15:40:42-05:00 </i>
</div>
<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;'>eventlog: Fix off-by-one error in postIPE
We were missing the extra_comma from the calculation of the size of the
payload of postIPE. This was causing assertion failures when the event
would overflow the buffer by one byte, as ensureRoomForVariable event
would report there was enough space for `n` bytes but then we would
write `n + 1` bytes into the buffer.
Fixes #24287
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66dc09b193297c5817dc6b951a2eb99022b06d05">66dc09b1</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-01-16T15:41:18-05:00 </i>
</div>
<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;'>Improve SpecConstr (esp nofib/spectral/ansi)
This MR makes three improvements to SpecConstr: see #24282
* It fixes an outright (and recently-introduced) bug in `betterPat`, which
was wrongly forgetting to compare the lengths of the argument lists.
* It enhances ConVal to inclue a boolean for work-free-ness, so that the
envt can contain non-work-free constructor applications, so that we
can do more: see Note [ConVal work-free-ness]
* It rejigs `subsumePats` so that it doesn't reverse the list. This can
make a difference because, when patterns overlap, we arbitrarily pick
the first. There is no "right" way, but this retains the old
pre-subsumePats behaviour, thereby "fixing" the regression in #24282.
Nofib results
+========================================
| spectral/ansi -21.14%
| spectral/hartel/comp_lab_zift -0.12%
| spectral/hartel/parstof +0.09%
| spectral/last-piece -2.32%
| spectral/multiplier +6.03%
| spectral/para +0.60%
| spectral/simple -0.26%
+========================================
| geom mean -0.18%
+----------------------------------------
The regression in `multiplier` is sad, but it simply replicates GHC's
previous behaviour (e.g. GHC 9.6).
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65da79b39d040092f42c6a1f6bbe3c13f7d0bb99">65da79b3</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-01-16T15:41:54-05:00 </i>
</div>
<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;'>hadrian: Reduce Cabal verbosity
The comment claims that `simpleUserHooks` decrease verbosity, and it
does, but only for the `postConf` phase. The other phases are too
verbose with `-V`.
At the moment > 5000 lines of the build log are devoted to output from
`cabal copy`.
So I take the simple approach and just decrease the verbosity level
again.
If the output of `postConf` is essential then it would be better to
implement our own `UserHooks` which doesn't decrease the verbosity for
`postConf`.
Fixes #24338
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3f2b227da2eab7363183f7910ac634b78106c03">d3f2b227</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-01-17T12:04:00+00:00 </i>
</div>
<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;'>Fix four bug in handling of (forall cv. body_ty)
These bugs are all described in #24335
It's not easy to provoke the bug, hence no test case.
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
30 changed files:
</h4>
<ul>
<li class="file-stats">
<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
</a>
</li>
<li class="file-stats">
<a href="#c3967bb9d3e8f5aae2dd111b5a335b48c21c1999">
compiler/GHC/Core/Opt/Arity.hs
</a>
</li>
<li class="file-stats">
<a href="#bac3d5159a5688007de3aa3f5c4e50569677b347">
compiler/GHC/Core/Opt/OccurAnal.hs
</a>
</li>
<li class="file-stats">
<a href="#ae6d91a5d028418bbf1431347d659e744e0a3128">
compiler/GHC/Core/Opt/Simplify/Iteration.hs
</a>
</li>
<li class="file-stats">
<a href="#48fbb5cdea308650de5756521feb28ec68819b9b">
compiler/GHC/Core/Opt/Simplify/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#b6a5ba32bafb8fbda933538b3007e755fef6f101">
compiler/GHC/Core/Opt/SpecConstr.hs
</a>
</li>
<li class="file-stats">
<a href="#d01de95d8c71d4dec6a9a59146186e29a5b3fd38">
compiler/GHC/Core/Rules.hs
</a>
</li>
<li class="file-stats">
<a href="#846e2566b022c9a12a5978ac7934d5b019fbea5c">
compiler/GHC/Core/Tidy.hs
</a>
</li>
<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#1a7aba0daeafab195716dd25432479804a55ab60">
compiler/GHC/Core/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#d79a8a61508cb6c5f38a23ab2b691bb77306f672">
compiler/GHC/CoreToStg.hs
</a>
</li>
<li class="file-stats">
<a href="#a5d27de4e3111a69f69902c65ecf7b3379f7c49a">
compiler/GHC/CoreToStg/Prep.hs
</a>
</li>
<li class="file-stats">
<a href="#e65e7bbfc24f8830a20082bfc50f6d16e613cbeb">
compiler/GHC/Driver/DynFlags.hs
</a>
</li>
<li class="file-stats">
<a href="#2e5692f568fd7b67a6b172e2a60469da8392508c">
compiler/GHC/Driver/Flags.hs
</a>
</li>
<li class="file-stats">
<a href="#f2b2b84d138b362920ab9f144f58bf16254aab64">
compiler/GHC/Iface/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#657eec52eed3c8be846a0b60eb6088d5f465de8a">
compiler/GHC/Stg/Lift/Analysis.hs
</a>
</li>
<li class="file-stats">
<a href="#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7">
compiler/GHC/Tc/Gen/Splice.hs
</a>
</li>
<li class="file-stats">
<a href="#248bd3942da964eb354064aecbd931c51a46cd20">
compiler/GHC/Types/CompleteMatch.hs
</a>
</li>
<li class="file-stats">
<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
</a>
</li>
<li class="file-stats">
<a href="#261c0c5029eb34eb7436b087d77314f377ff8223">
compiler/GHC/Types/Id/Make.hs
</a>
</li>
<li class="file-stats">
<a href="#523e258f899a29c551e69a88115587d32ba73db1">
docs/users_guide/9.10.1-notes.rst
</a>
</li>
<li class="file-stats">
<a href="#56cab10ba9d31c526f47a492a4151a878077dc2d">
docs/users_guide/9.8.1-notes.rst
</a>
</li>
<li class="file-stats">
<a href="#36435f993774454b5956f3a38a9276ed176c61cc">
docs/users_guide/debugging.rst
</a>
</li>
<li class="file-stats">
<a href="#dbcbd7b55b6584a40b8c7bd1f31599dacce2dbd6">
docs/users_guide/exts/required_type_arguments.rst
</a>
</li>
<li class="file-stats">
<a href="#9114465b0120ae8f2588fc60cb49ff264de54ecb">
docs/users_guide/profiling.rst
</a>
</li>
<li class="file-stats">
<a href="#e16ae6db99f98868d3603a0c7df0bb6a793a330d">
docs/users_guide/using-warnings.rst
</a>
</li>
<li class="file-stats">
<a href="#af1d9e2647379d23697be69f8b7fc568ed0294c5">
docs/users_guide/using.rst
</a>
</li>
<li class="file-stats">
<a href="#579888c35e9965d115a2349ac57e4ff79e87518f">
hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
</a>
</li>
<li class="file-stats">
<a href="#6c93025dd021b74dda705f36d078e02bcda0ccfe">
hadrian/src/Rules/Documentation.hs
</a>
</li>
<li class="file-stats">
<a href="#392e9dfd3417e267d708c5ab16536f2994d43745">
libraries/base/changelog.md
</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>
<div class="footer" style="margin-top: 10px;">
<p style="font-size: small; color: #737278;">
—
<br>
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/003f578a2f57cb9209d3d4ea3a23946e141b8cd2...d3f2b227da2eab7363183f7910ac634b78106c03">View it on GitLab</a>.
<br>
You're receiving this email because of your account on <a target="_blank" rel="noopener noreferrer" href="https://gitlab.haskell.org">gitlab.haskell.org</a>. <a href="https://gitlab.haskell.org/-/profile/notifications" target="_blank" rel="noopener noreferrer" class="mng-notif-link">Manage all notifications</a> · <a href="https://gitlab.haskell.org/help" target="_blank" rel="noopener noreferrer" class="help-link">Help</a>
</p>
</div>
</body>
</html>