<!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, "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, -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, -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;">
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/61a2dfaa1ab4e1502c0ab00818150de0a033412a">61a2dfaa</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-03-30T14:35:57-04:00 </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 {-# WARNING #-} to Data.List.{head,tail}
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f15c47c729236e647a7aa147751afa0320f2e70">8f15c47c</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-03-30T14:35:57-04:00 </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;'>Fixes to accomodate Data.List.{head,tail} with {-# WARNING #-}
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c7dbade771dabaf33a2f0e0675e26865a213968">7c7dbade</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-03-30T14:35:57-04:00 </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;'>Bump submodules
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2d8251b32a3546bb4984c9bd027917883ab4969">d2d8251b</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-03-30T14:35:57-04:00 </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;'>Fix tests
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d38dcb6e4b6ceeeeac79570faa42c33bfd10dfc">3d38dcb6</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-03-30T14:35:57-04:00 </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;'>Proxies for head and tail: review suggestions</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/930edcfd10f00d98c746f2198d59546034943ac6">930edcfd</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-03-30T14:36:33-04:00 </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;'>docs: move RecordUpd changelog entry to 9.8
This was accidentally included in the 9.6 changelog
instead of the 9.6 changelog.</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f885e6575eb741556d6e198d1a9dbdadf10307b">6f885e65</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-03-30T14:37:09-04:00 </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;'>Add LANGUAGE GADTs to GHC.Rename.Env
We need to enable this extension for the file to compile with ghc 9.2,
as we are pattern matching on a GADT and this required the GADT extension
to be enabled until 9.4.</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d6a37a8f7dd136b067edfe0d4860a77e15e4186">6d6a37a8</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:42:56+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;'>ci: make lint-ci-config job fast again
We don't pin our nixpkgs revision and tracks the default
nixpkgs-unstable channel anyway. Instead of using
haskell.packages.ghc924, we should be using haskell.packages.ghc92 to
maximize the binary cache hit rate and make lint-ci-config job fast
again. Also bumps the nix docker image to the latest revision.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef1548c499d69a156d9f0772c859e0e5cdb0892b">ef1548c4</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:42:56+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;'>ci: ensure that all non-i386 pipelines do parallel xz compression
We can safely enable parallel xz compression for non-i386 pipelines.
However, previously we didn't export XZ_OPT, so the xz process won't
see it if XZ_OPT hasn't already been set in the current job.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20432d16d9a367528f59858b1acad2fae539e993">20432d16</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:42:56+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;'>ci: unset CROSS_EMULATOR for js job
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a24dbbe2cb4ec5311af01321d1721e8964d0672">4a24dbbe</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:42:56+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;'>ci: fix lint-testsuite job
The list_broken make target will transitively depend on the
calibrate.out target, which used STAGE1_GHC instead of TEST_HC. It
really should be TEST_HC since that's what get passed in the gitlab CI
config.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cea56ccca154d477d858f3b25008df42b68a2b17">cea56ccc</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:42:56+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;'>ci: use alpine3_17-wasm image for wasm jobs
Bump the ci-images dependency and use the new alpine3_17-wasm docker
image for wasm jobs.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/79d0cb3210e71bc5eca97af7e12a654134336d1f">79d0cb32</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2023-03-30T18:43:53+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;'>testsuite/driver: Add basic support for testing cross-compilers
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e7392b4ecb39166328e60358e302108b6a9339b9">e7392b4e</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2023-03-30T18:43:53+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;'>testsuite/driver: Normalize away differences in ghc executable name
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee160d067fe319d73f64c8131c11873d6e065152">ee160d06</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2023-03-30T18:43:53+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;'>hadrian: Pass CROSS_EMULATOR to runtests.py
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30c84511af8ad70705bbde98d0ba73cdbb1d8565">30c84511</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: don't add optllvm way for wasm32
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1beee369840b42183d17ab6175fd860f14f869d">f1beee36</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: normalize the .wasm extension
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a984a103ce08faf907d08980fa2e58cacf3aa531">a984a103</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: strip the cross ghc prefix in output and error message
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7478d9543293cd78ce81c1aa730cc3025cffe9e">f7478d95</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: handle target executable extension
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8fe8b65390bdbd6b51af42a227300c46cca89b3b">8fe8b653</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: mypy typing error fixes
This patch fixes some mypy typing errors which weren't caught in
previous linting jobs.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0149f32fc8cc805ff368e5b3e36051d0d1898550">0149f32f</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: use context variable instead of thread-local variable
This patch changes a thread-local variable to context variable
instead, which works as intended when the testsuite transitions to use
asyncio & coroutines instead of multi-threading to concurrently run
test cases. Note that this also raises the minimum Python version to
3.7.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea853ff066afb4d4f2271b24be898693e2a3e18d">ea853ff0</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-03-30T18:43:53+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;'>testsuite: asyncify the testsuite driver
This patch refactors the testsuite driver, gets rid of multi-threading
logic for running test cases concurrently, and uses asyncio &
coroutines instead. This is not yak shaving for its own sake; the
previous multi-threading logic is prone to livelock/deadlock
conditions for some reason, even if the total number of threads is
bounded to a thread pool's capacity.
The asyncify change is an internal implementation detail of the
testsuite driver and does not impact most GHC maintainers out there.
The patch does not touch the .T files, test cases can be
added/modified the exact same way as before.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0077cb225bde18ee6c7ff49d6486eb20fc6c011a">0077cb22</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2023-03-31T21:28:28-04:00 </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 test for T23184
There was an outright bug, which Simon fixed in July 2021, as a little side-fix on a complicated patch:
```
commit 6656f0165a30fc2a22208532ba384fc8e2f11b46
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Fri Jul 23 23:57:01 2021 +0100
A bunch of changes related to eta reduction
This is a large collection of changes all relating to eta
reduction, originally triggered by #18993, but there followed
a long saga.
Specifics:
...lots of lines omitted...
Other incidental changes
* Fix a fairly long-standing outright bug in the ApplyToVal case of
GHC.Core.Opt.Simplify.mkDupableContWithDmds. I was failing to take the
tail of 'dmds' in the recursive call, which meant the demands were All
Wrong. I have no idea why this has not caused problems before now.
```
Note this "Fix a fairly longstanding outright bug". This is the specific fix
```
@@ -3552,8 +3556,8 @@ mkDupableContWithDmds env dmds
-- let a = ...arg...
-- in [...hole...] a
-- NB: sc_dup /= OkToDup; that is caught earlier by contIsDupable
- do { let (dmd:_) = dmds -- Never fails
- ; (floats1, cont') <- mkDupableContWithDmds env dmds cont
+ do { let (dmd:cont_dmds) = dmds -- Never fails
+ ; (floats1, cont') <- mkDupableContWithDmds env cont_dmds cont
; let env' = env `setInScopeFromF` floats1
; (_, se', arg') <- simplArg env' dup se arg
; (let_floats2, arg'') <- makeTrivial env NotTopLevel dmd (fsLit "karg") arg'
```
Ticket #23184 is a report of the bug that this diff fixes.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/62d25071791b68fa63a2bb007fd1ac565795a9c5">62d25071</a></strong>
<div>
<span> by mangoiv </span> <i> at 2023-04-01T04:20:01-04:00 </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;'>[feat] make ($) representation polymorphic
- this change was approved by the CLC in [1] following a CLC proposal [2]
- make ($) representation polymorphic (adjust the type signature)
- change ($) implementation to allow additional polymorphism
- adjust the haddock of ($) to reflect these changes
- add additional documentation to document these changes
- add changelog entry
- adjust tests (move now succeeding tests and adjust stdout of some
tests)
[1] https://github.com/haskell/core-libraries-committee/issues/132#issuecomment-1487456854
[2] https://github.com/haskell/core-libraries-committee/issues/132
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/77c33fb924d75f502e275c7afbf157e6d963abf4">77c33fb9</a></strong>
<div>
<span> by Artem Pelenitsyn </span> <i> at 2023-04-01T04:20:41-04:00 </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 Guide: update copyright year: 2020->2023
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b5be05ac29e2ec033e108e15f052f2a13898f24">3b5be05a</a></strong>
<div>
<span> by doyougnu </span> <i> at 2023-04-01T09:42:31-04:00 </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;'>driver: Unit State Data.Map -> GHC.Unique.UniqMap
In pursuit of #22426. The driver and unit state are major contributors.
This commit also bumps the haddock submodule to reflect the API changes in
UniqMap.
-------------------------
Metric Decrease:
MultiComponentModules
MultiComponentModulesRecomp
T10421
T10547
T12150
T12234
T12425
T13035
T16875
T18140
T18304
T18698a
T18698b
T18923
T20049
T5837
T6048
T9198
-------------------------
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a84fba6eb5cae43bd79cc1b26eadd7a2aa36099b">a84fba6e</a></strong>
<div>
<span> by Torsten Schmits </span> <i> at 2023-04-01T09:43:12-04:00 </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
Tracking ticket: #20117
MR: !10183
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/6e2eb275a1b6d3d1dae9c2864f001bea69d20c2a">6e2eb275</a></strong>
<div>
<span> by doyougnu </span> <i> at 2023-04-01T18:27:56-04:00 </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;'>JS: Linker: use saturated JExpr
Follow on to MR!10142 in pursuit of #22736
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3da693466fd3e6a609a1a77361c50ed1b141858d">3da69346</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-04-01T18:28:37-04:00 </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;'>Improve haddocks of template-haskell Con datatype
This adds a bit more information, in particular about the lists of
constructors in the GadtC and RecGadtC cases.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b7bbb39f28c926f8cfd30744253a418854bee31">3b7bbb39</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-04-01T18:28:37-04:00 </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;'>TH: revert changes to GadtC & RecGadtC
Commit 3f374399 included a breaking-change to the template-haskell
library when it made the GadtC and RecGadtC constructors take non-empty
lists of names. As this has the potential to break many users' packages,
we decided to revert these changes for now.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f60f6110c1d08cb1885dce1984d5051de03dce8e">f60f6110</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-04-02T18:59:30-04:00 </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;'>Rework documentation for data Char
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43ebd5dcdb7ff65b6afccbdee22d2c27f9df6b1c">43ebd5dc</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-04-02T19:00:09-04:00 </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;'>cmm: implement parsing of MO_AtomicRMW from hand-written CMM files
Fixes #23206
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ab9cd52d4fac34a2b37ce07bc9e9e2943c92d181">ab9cd52d</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-03T08:15:21-04:00 </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;'>ghc-heap: remove wrong Addr# coercion (#23181)
Conversion from Addr# to I# isn't correct with the JS backend.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b2afff3ac8de85e7a035b71ab3890b8eed760c9">2b2afff3</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2023-04-03T08:15:58-04:00 </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;'>hadrian: Update bootstrap plans for 9.2.6, 9.2.7, 9.4.4, 9.4.5, 9.6.1
Also fixes the ./generate_bootstrap_plans script which was recently
broken
We can hopefully drop the 9.2 plans soon but they still work so kept
them around for now.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2605e25bb166245310a13386e7f77915e9c2c3f">c2605e25</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2023-04-03T08:15:58-04:00 </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;'>ci: Add job to test 9.6 bootstrapping
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53e4d513a55df3c13424e7b649ce85b8113fa4c2">53e4d513</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2023-04-03T08:16:35-04:00 </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;'>hadrian: Improve option parsing
Several options in Hadrian had their argument marked as optional
(`OptArg`), but if the argument wasn't there they were just giving an
error. It's more idiomatic to mark the argument as required instead;
the code uses less Maybes, the parser can enforce that the argument
is present, --help gives better output.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8e36892689bd6b8fb472844f79aeeddeda92e0a">a8e36892</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-03T08:17:16-04:00 </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;'>JS: fix issues with FD api support
- Add missing implementations for fcntl_read/write/lock
- Fix fdGetMode
These were found while implementing TH in !9779. These functions must be
used somehow by the external interpreter code.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b092910ac18a2b5dc97a29ced9fc469c663a03b">8b092910</a></strong>
<div>
<span> by Haskell-mouse </span> <i> at 2023-04-03T19:31:26-04:00 </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;'>Convert diagnostics in GHC.Rename.HsType to proper TcRnMessage
I've turned all occurrences of TcRnUnknownMessage in GHC.Rename.HsType
module into a proper TcRnMessage.
Instead, these TcRnMessage messages were introduced:
TcRnDataKindsError
TcRnUnusedQuantifiedTypeVar
TcRnIllegalKindSignature
TcRnUnexpectedPatSigType
TcRnSectionPrecedenceError
TcRnPrecedenceParsingError
TcRnIllegalKind
TcRnNegativeNumTypeLiteral
TcRnUnexpectedKindVar
TcRnBindMultipleVariables
TcRnBindVarAlreadyInScope
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/220a7a48cabdcfd2ef7bf5dbe3fd6df99e8d3c5b">220a7a48</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2023-04-03T19:32:02-04:00 </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;'>Fixes around unsafeCoerce#
1. `unsafeCoerce#` was documented in `GHC.Prim`. But since the overhaul
in 74ad75e87317, `unsafeCoerce#` is no longer defined there.
I've combined the documentation in `GHC.Prim` with the `Unsafe.Coerce` module.
2. The documentation of `unsafeCoerce#` stated that you should not
cast a function to an algebraic type, even if you later cast it back
before applying it. But ghci was doing that type of cast, as can be seen
with 'ghci -ddump-ds' and typing 'x = not'. I've changed it to use Any
following the documentation.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9095e297fbb46781fd182210609ce2a3f6c59b7a">9095e297</a></strong>
<div>
<span> by Matthew Craven </span> <i> at 2023-04-04T01:04:10-04:00 </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 a few more memcpy-ish primops
* copyMutableByteArrayNonOverlapping#
* copyAddrToAddr#
* copyAddrToAddrNonOverlapping#
* setAddrRange#
The implementations of copyBytes, moveBytes, and fillBytes
in base:Foreign.Marshal.Utils now use these new primops,
which can cause us to work a bit harder generating code for them,
resulting in the metric increase in T21839c observed by CI on
some architectures. But in exchange, we get better code!
Metric Increase:
T21839c
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7da530c80c0117d5684bb52481e4a40d7e724cc">f7da530c</a></strong>
<div>
<span> by Matthew Craven </span> <i> at 2023-04-04T01:04:10-04:00 </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;'>StgToCmm: Upgrade -fcheck-prim-bounds behavior
Fixes #21054. Additionally, we can now check for range overlap
when generating Cmm for primops that use memcpy internally.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd00e321d5d7aaee3999b283a2a2f0d77f7b3e8e">cd00e321</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-04-04T01:04:50-04:00 </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;'>Relax assertion in varToRecFieldOcc
When using Template Haskell, it is possible to re-parent a field OccName
belonging to one data constructor to another data constructor. The
lsp-types package did this in order to "extend" a data constructor
with additional fields.
This ran into an assertion in 'varToRecFieldOcc'. This assertion
can simply be relaxed, as the resulting splices are perfectly sound.
Fixes #23220
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eed0d9307b3f48b6a2e45dbb246610cf4ab73896">eed0d930</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-04T11:09:15-04:00 </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;'>GHCi.RemoteTypes: fix doc and avoid unsafeCoerce (#23201)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/071139c30ab95e6a292bec8ae0dcb6bf2be6308d">071139c3</a></strong>
<div>
<span> by Ryan Scott </span> <i> at 2023-04-04T11:09:51-04:00 </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;'>Make INLINE pragmas for pattern synonyms work with TH
Previously, the code for converting `INLINE <name>` pragmas from TH splices
used `vNameN`, which assumed that `<name>` must live in the variable namespace.
Pattern synonyms, on the other hand, live in the constructor namespace. I've
fixed the issue by switching to `vcNameN` instead, which works for both the
variable and constructor namespaces.
Fixes #23203.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c16f3be6e1ac92f87d752f12ad6c6e7b7fd6207">7c16f3be</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2023-04-04T17:13:00-04:00 </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;'>Fix unification with oversaturated type families
unify_ty was incorrectly saying that F x y ~ T x are surely apart,
where F x y is an oversaturated type family and T x is a tyconapp.
As a result, the simplifier dropped a live case alternative (#23134).
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c165f079a13232a44689c55a61c70e2c9aea5464">c165f079</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-04-04T17:13:40-04:00 </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 testcase for #23192
This issue around solving of constraints arising from superclass
expansion using other constraints also borned from superclass expansion
was the topic of commit aed1974e. That commit made sure we don't emit
a "redundant constraint" warning in a situation in which removing the
constraint would cause errors.
Fixes #23192
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1bb16ed3e18a4f41fcfe31f0bf57dbaf589d6c5">d1bb16ed</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2023-04-06T03:40:45-04:00 </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;'>nonmoving: Disable slop-zeroing
As noted in #23170, the nonmoving GC can race with a mutator zeroing the
slop of an updated thunk (in much the same way that two mutators would
race). Consequently, we must disable slop-zeroing when the nonmoving GC
is in use.
Closes #23170
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04b80850c535fa8c11f435711577296a99499105">04b80850</a></strong>
<div>
<span> by Brandon Chinn </span> <i> at 2023-04-06T03:41:21-04:00 </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;'>Fix reverse flag for -Wunsupported-llvm-version</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c990e13c36b7be7d3bd3af050ad49182a028f21">0c990e13</a></strong>
<div>
<span> by Pierre Le Marre </span> <i> at 2023-04-06T10:16:29+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;'>Add release note for GHC.Unicode refactor in base-4.18.
Also merge CLC proposal 130 in base-4.19 with CLC proposal 59 in
base-4.18 and add proper release date.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cbbfb283dc58f6d582638ee60a96dc5c4b8acc4a">cbbfb283</a></strong>
<div>
<span> by Alex Dixon </span> <i> at 2023-04-07T18:27:45-04:00 </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;'>Improve documentation for ($) (#22963)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5193c2b00194a4f536f0c31fe48ef4648b55a416">5193c2b0</a></strong>
<div>
<span> by Alex Dixon </span> <i> at 2023-04-07T18:27:45-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.875rem; color: #333238; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>Remove trailing whitespace from ($) commentary
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b384523bab0650ba1e6b09f3c7aa64a92a90fe3b">b384523b</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2023-04-07T18:27:45-04:00 </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;'>Adjust wording wrt representation polymorphism of ($)</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a788f0ad465cf49673b187c5feeae80b738ce54">6a788f0a</a></strong>
<div>
<span> by Torsten Schmits </span> <i> at 2023-04-07T22:29:28-04:00 </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.Utils
Tracking ticket: #20117
MR: !10251
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/3ba77b369a170ba68f4eb5c8f3ae13e03dcbb28d">3ba77b36</a></strong>
<div>
<span> by sheaf </span> <i> at 2023-04-07T22:30:07-04:00 </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;'>Renamer: don't call addUsedGRE on an exact Name
When looking up a record field in GHC.Rename.Env.lookupRecFieldOcc,
we could end up calling addUsedGRE on an exact Name, which would then
lead to a panic in the bestImport function: it would be incapable of
processing a GRE which is not local but also not brought into scope
by any imports (as it is referred to by its unique instead).
Fixes #23240
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc4795d207c132fbfe118958f7f39b140115f5bd">bc4795d2</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2023-04-11T19:24:54-04:00 </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;'>Add support for -debug in the testsuite
Confusingly, GhcDebugged referred to GhcDebugAssertions.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7474b57830261a94903da61bb2df33022c11357">b7474b57</a></strong>
<div>
<span> by Krzysztof Gogolewski </span> <i> at 2023-04-11T19:24:54-04:00 </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;'>Add missing cases in -Di prettyprinter
Fixes #23142
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c3926167dc6c2978531ecac06e1eda50874297a">6c392616</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-04-11T19:25:31-04:00 </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;'>compiler: make WasmCodeGenM an instance of MonadUnique
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05d26a650b6e9e1169b42376fe54bb00850722f2">05d26a65</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2023-04-11T19:25:31-04:00 </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;'>compiler: apply cmm node-splitting for wasm backend
This patch applies cmm node-splitting for wasm32 NCG, which is
required when handling irreducible CFGs. Fixes #23237.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1892cc0c142e74640c320795493161d9321387f">f1892cc0</a></strong>
<div>
<span> by Bodigrim </span> <i> at 2023-04-11T19:26:09-04:00 </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;'>Set base 'maintainer' field to CLC
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecf22da3c6d992d76fbb8e970b4ffbabb445d38a">ecf22da3</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-04-11T19:26:45-04:00 </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;'>Clarify a couple of Notes about 'nospec'
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebd8918b7c50ae51921664e24fac0de4376ffcf9">ebd8918b</a></strong>
<div>
<span> by Oleg Grenrus </span> <i> at 2023-04-12T12:32:57-04:00 </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 generation of TTH syntax with TH
In other words allow generation of typed splices and brackets with
Untyped Template Haskell.
That is useful in cases where a library is build with TTH in mind,
but we still want to generate some auxiliary declarations,
where TTH cannot help us, but untyped TH can.
Such example is e.g. `staged-sop` which works with TTH,
but we would like to derive `Generic` declarations with TH.
An alternative approach is to use `unsafeCodeCoerce`, but then the
derived `Generic` instances would be type-checked only at use sites,
i.e. much later. Also `-ddump-splices` output is quite ugly:
user-written instances would use TTH brackets, not `unsafeCodeCoerce`.
This commit doesn't allow generating of untyped template splices
and brackets with untyped TH, as I don't know why one would want to do
that (instead of merging the splices, e.g.)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/690d0225d297a8c5c423ec4e63ee709df9d96d47">690d0225</a></strong>
<div>
<span> by Rodrigo Mesquita </span> <i> at 2023-04-12T12:33:33-04:00 </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 regression test for #23229
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/593218794199e23cdfc1a94200cbb9f404e28720">59321879</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-13T08:50:33-04:00 </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 quotRem rules (#22152)
case quotRemInt# x y of
(# q, _ #) -> body
====>
case quotInt# x y of
q -> body
case quotRemInt# x y of
(# _, r #) -> body
====>
case remInt# x y of
r -> body
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4dd021227559e1bc70cdaed12e45ff5459c33d27">4dd02122</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-13T08:50:33-04:00 </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 quot folding rule (#22152)
(x / l1) / l2
l1 and l2 /= 0
l1*l2 doesn't overflow
==> x / (l1 * l2)
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1148ac723d6a879593dc4e7941a49b8e74e4c7d7">1148ac72</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-13T08:50:33-04:00 </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;'>Make Int64/Word64 division ok for speculation too.
Only when the divisor is definitely non-zero.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8af401ccfbe28d7bbfc493c0097834e9c66a36b0">8af401cc</a></strong>
<div>
<span> by Sylvain Henry </span> <i> at 2023-04-13T08:50:33-04:00 </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;'>Make WordQuotRem2Op ok-for-speculation too
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27d2978e5412f2bef4448e208182a03137dd5ee8">27d2978e</a></strong>
<div>
<span> by Josh Meredith </span> <i> at 2023-04-13T08:51:09-04:00 </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;'>Base/JS: GHC.JS.Foreign.Callback module (issue 23126)
* Add the Callback module for "exporting" Haskell functions
to be available to plain JavaScript code
* Fix some primitives defined in GHC.JS.Prim
* Add a JavaScript section to the user guide with instructions
on how to use the JavaScript FFI, building up to using Callbacks
to interact with the browser
* Add tests for the JavaScript FFI and Callbacks
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a34aa8da1293f997ce9212ccdc2ec56df4a2e9c1">a34aa8da</a></strong>
<div>
<span> by Adam Sandberg Ericsson </span> <i> at 2023-04-14T04:17:52-04:00 </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;'>rts: improve memory ordering and add some comments in the StablePtr implementation
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7a768a415c3bd575a20b20ae9a3953aa5886ed7">d7a768a4</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2023-04-14T04:18:28-04:00 </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;'>docs: Generate docs/index.html with version number
* Generate docs/index.html to include the version of the ghc library
* This also fixes the packageVersions interpolations which were
- Missing an interpolation for `LIBRARY_ghc_VERSION`
- Double quoting the version so that "9.7" was being inserted.
Fixes #23121
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d48fbfea5f7b760ec3d13dd2947257986c095b75">d48fbfea</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-04-14T04:19:05-04:00 </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;'>Stop if type constructors have kind errors
Otherwise we get knock-on errors, such as #23252.
This makes GHC fail a bit sooner, and I have not attempted to add
recovery code, to add a fake TyCon place of the erroneous one,
in an attempt to get more type errors in one pass. We could
do that (perhaps) if there was a call for it.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2371d6b2d178895cc97f7bfebf489af4a095241b">2371d6b2</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-04-14T20:01:02+02:00 </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;'>Major refactor in the handling of equality constraints
This MR substantially refactors the way in which the constraint
solver deals with equality constraints. The big thing is:
* Intead of a pipeline in which we /first/ canonicalise and /then/
interact (the latter including performing unification) the two steps
are more closely integreated into one. That avoids the current
rather indirect communication between the two steps.
The proximate cause for this refactoring is fixing #22194, which involve
solving [W] alpha[2] ~ Maybe (F beta[4])
by doing this:
alpha[2] := Maybe delta[2]
[W] delta[2] ~ F beta[4]
That is, we don't promote beta[4]! This is very like introducing a cycle
breaker, and was very awkward to do before, but now it is all nice.
See GHC.Tc.Utils.Unify Note [Promotion and level-checking] and
Note [Family applications in canonical constraints].
The big change is this:
* Several canonicalisation checks (occurs-check, cycle-breaking,
checking for concreteness) are combined into one new function:
GHC.Tc.Utils.Unify.checkTyEqRhs
This function is controlled by `TyEqFlags`, which says what to do
for foralls, type families etc.
* `canEqCanLHSFinish` now sees if unification is possible, and if so,
actually does it: see `canEqCanLHSFinish_try_unification`.
There are loads of smaller changes:
* The on-the-fly unifier `GHC.Tc.Utils.Unify.unifyType` has a
cheap-and-cheerful version of `checkTyEqRhs`, called
`simpleUnifyCheck`. If `simpleUnifyCheck` succeeds, it can unify,
otherwise it defers by emitting a constraint. This is simpler than
before.
* I simplified the swapping code in `GHC.Tc.Solver.Equality.canEqCanLHS`.
Especially the nasty stuff involving `swap_for_occurs` and
`canEqTyVarFunEq`. Much nicer now. See
Note [Orienting TyVarLHS/TyFamLHS]
Note [Orienting TyFamLHS/TyFamLHS]
* Added `cteSkolemOccurs`, `cteConcrete`, and `cteCoercionHole` to the
problems that can be discovered by `checkTyEqRhs`.
* I fixed #23199 `pickQuantifiablePreds`, which actually allows GHC to
to accept both cases in #22194 rather than rejecting both.
Yet smaller:
* Added a `synIsConcrete` flag to `SynonymTyCon` (alongside `synIsFamFree`)
to reduce the need for synonym expansion when checking concreteness.
Use it in `isConcreteType`.
* Renamed `isConcrete` to `isConcreteType`
* Defined `GHC.Core.TyCo.FVs.isInjectiveInType` as a more efficient
way to find if a particular type variable is used injectively than
finding all the injective variables. It is called in
`GHC.Tc.Utils.Unify.definitely_poly`, which in turn is used quite a
lot.
* Moved `rewriterView` to `GHC.Core.Type`, so we can use it from the
constraint solver.
Fixes #22194, #23199
Compile times decrease by an average of 0.1%; but there is a 7.4%
drop in compiler allocation on T15703.
Metric Decrease:
T15703
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99b2734b8a167d27d0066b331bfb4cf220326ce0">99b2734b</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-04-14T20:01:02+02:00 </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 some documentation about redundant constraints
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f2d0eb826cbd6414fe2f31085aec8e20fb2976f">3f2d0eb8</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-04-14T20:01:02+02:00 </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;'>Improve partial signatures
This MR fixes #23223. The changes are in two places:
* GHC.Tc.Bind.checkMonomorphismRestriction
See the new `Note [When the MR applies]`
We now no longer stupidly attempt to apply the MR when the user
specifies a context, e.g. f :: Eq a => _ -> _
* GHC.Tc.Solver.decideQuantification
See rewritten `Note [Constraints in partial type signatures]`
Fixing this bug apparently breaks three tests:
* partial-sigs/should_compile/T11192
* partial-sigs/should_fail/Defaulting1MROff
* partial-sigs/should_fail/T11122
However they are all symptoms of #23232, so I'm marking them as
expect_broken(23232).
I feel happy about this MR. Nice.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/23e2a8a0d7e626bcc327baab029e8d3ee2c5729b">23e2a8a0</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2023-04-14T20:01:02+02:00 </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;'>Make approximateWC a bit cleverer
This MR fixes #23224: making approximateWC more clever
See the long `Note [ApproximateWC]` in GHC.Tc.Solver
All this is delicate and ad-hoc -- but it /has/ to be: we are
talking about inferring a type for a binding in the presence of
GADTs, type families and whatnot: known difficult territory.
We just try as hard as we can.
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c04024617f1ee4c76844cfe0a886bab87c23bd0">2c040246</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2023-04-15T00:57:14-04:00 </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;'>docs: Update template-haskell docs to use Code Q a rather than Q (TExp a)
Since GHC Proposal #195, the type of [|| ... ||] has been Code Q a
rather than Q (TExp a). The documentation in the `template-haskell`
library wasn't updated to reflect this change.
Fixes #23148
</pre>
</li>
<li>
<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22bf9c7b05f824f9eafa0ad7d436cc6b1790bd87">22bf9c7b</a></strong>
<div>
<span> by Ryan Scott </span> <i> at 2023-04-15T13:01:35+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;'>validDerivPred: Reject exotic constraints in IrredPreds
This brings the `IrredPred` case in sync with the treatment of `ClassPred`s as
described in `Note [Valid 'deriving' predicate]` in `GHC.Tc.Validity`. Namely,
we should reject `IrredPred`s that are inferred from `deriving` clauses whose
arguments contain other type constructors, as described in `(VD2) Reject exotic
constraints` of that Note. 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.
While I was in town, I noticed that much of `Note [Valid 'deriving' predicate]`
was duplicated in a separate `Note [Exotic derived instance contexts]` in
`GHC.Tc.Deriv.Infer`. I decided to fold the latter Note into the former so that
there is a single authority on describing the conditions under which an
inferred `deriving` constraint can be considered valid.
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 there is, there is a clear, backwards-compatible migration path using
`StandaloneDeriving`.
Fixes #22696.
</pre>
</li>
</ul>
<h4 style="margin-top: 10px; margin-bottom: 10px;">
30 changed files:
</h4>
<ul>
<li class="file-stats">
<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
</a>
</li>
<li class="file-stats">
<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
.gitlab/ci.sh
</a>
</li>
<li class="file-stats">
<a href="#a6883fe5ffe69ebc49b16c7e553faba405221f57">
.gitlab/gen_ci.hs
</a>
</li>
<li class="file-stats">
<a href="#54bac86f1d2900cfe25a8a46290024e4d739ebee">
.gitlab/generate_job_metadata
</a>
</li>
<li class="file-stats">
<a href="#7402c88acd995cad343c10862e77c283382d6d77">
.gitlab/generate_jobs
</a>
</li>
<li class="file-stats">
<a href="#4f7fc727dfc06c2591e6043f44b9602eddfc3673">
.gitlab/jobs.yaml
</a>
</li>
<li class="file-stats">
<a href="#a1519b7fe8a0d4b42e4aaa927fb6ab5b5da0fcdd">
compiler/GHC/Builtin/PrimOps.hs
</a>
</li>
<li class="file-stats">
<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
</a>
</li>
<li class="file-stats">
<a href="#db697f6aea9f93f1583f1d5c62d25570a1e07f73">
compiler/GHC/Cmm/CLabel.hs
</a>
</li>
<li class="file-stats">
<a href="#71e696f452eb493722d70306c6f304fc9b2f6a95">
compiler/GHC/Cmm/Parser.y
</a>
</li>
<li class="file-stats">
<a href="#94b86a17d123043012c2097c7c9559de28d86ad6">
compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
</a>
</li>
<li class="file-stats">
<a href="#825088b64079a9a13d84105d46c0694ffe948b58">
compiler/GHC/CmmToAsm/Wasm/Types.hs
</a>
</li>
<li class="file-stats">
<a href="#222744ff45490ea06d35031e3e2900e04ea7d0af">
compiler/GHC/CmmToAsm/Wasm/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#5596bb0f228bd2a308c4391df97375ae879430a8">
compiler/GHC/Core/InstEnv.hs
</a>
</li>
<li class="file-stats">
<a href="#aa79261abf782f3dc603af7fbd5c4b08ed3ddb88">
compiler/GHC/Core/Opt/ConstantFold.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="#039e8f5676356ef05c90af828aae48aac7296e47">
compiler/GHC/Core/TyCo/FVs.hs
</a>
</li>
<li class="file-stats">
<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
</a>
</li>
<li class="file-stats">
<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
</a>
</li>
<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#a11863ba405cb13e5c25518fb7c6048b20e277f7">
compiler/GHC/Core/Type.hs-boot
</a>
</li>
<li class="file-stats">
<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
</a>
</li>
<li class="file-stats">
<a href="#1a7aba0daeafab195716dd25432479804a55ab60">
compiler/GHC/Core/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#2fefe3125c649bc5377b06a7cca18e785855b79c">
compiler/GHC/Data/Bag.hs
</a>
</li>
<li class="file-stats">
<a href="#f4ae6618b39d5ee4af8302b821aa7e38097a84b7">
compiler/GHC/Data/Maybe.hs
</a>
</li>
<li class="file-stats">
<a href="#1dab250036d04cfcf3530f6ff27889f723cc2dda">
compiler/GHC/Driver/Make.hs
</a>
</li>
<li class="file-stats">
<a href="#a88e37fd75518e72f2ff9ba8b377b535660fab76">
compiler/GHC/Hs/Doc.hs
</a>
</li>
<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#3c19c0be465f9a28d7b69f89c55648080fcc37eb">
compiler/GHC/HsToCore/Quote.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>
<div class="footer" style="margin-top: 10px;">
<p style="font-size: small; color: #737278;">
—
<br>
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/e2b7c4b092eb55bfc2443bf5388ead312c39e5f0...22bf9c7b05f824f9eafa0ad7d436cc6b1790bd87">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>