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<h3 style="margin-top: 20px; margin-bottom: 10px;">
Simon Peyton Jones pushed to branch wip/T25281 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: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69960230cc2c04a8b554ae8b7ebb85626749bf45">69960230</a></strong>
<div>
<span> by Fabian Thorand </span> <i> at 2024-10-10T19:03:59+00:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Handle exceptions from IO manager backend
If an IO manager backend throws, it will not actually have registered
the file descriptor. However, at that point, the IO manager state was
already updated to assume the file descriptor is being tracked, leading
to errors and an eventual deadlock down the line as documented in the
issue #21969.
The fix for this is to undo the IO manager state change in case the
backend throws (just as we already do when the backend signals that the
file type is not supported). The exception then bubbles up to user code.
That way we make sure that
1. the bookkeeping state of the IO manager is consistent with the
actions taken by the backend, even in the presence of unexpected
failures, and
2. the error is not silent and visible to user code, making failures
easier to debug.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1587cccfe7c3c1db3ccc48437b47ccb6ae215701">1587cccf</a></strong>
<div>
<span> by Hassan Al-Awwadi </span> <i> at 2024-10-11T03:52:36-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Put RdrName in the foExt field of FieldOcc
The main purpose of this commit is to rip RdrName out of FieldOcc, in
accordance with #21592, and as a side note it has simplified the method
we use to deal with ambiguity somewhat.
To do the first, we make FieldOccs store (LIdP p) instead of always
storing Located RdrName, and moved the readername to the extension
points where necessary.
For the second, well, we just turn an ambiguous RdrName into a unbound
Name through mkUnboundName. Later during disambiguateRecordBinds of the
type checking phase, we will try and do type-directed disambiguation based
on the rdrName field (for now), so this hack works out fine.
See Note [Ambiguous FieldOcc in record updates] for more details.
There are two additional minor changes in this commit:
* The HsRecSel constructor of HsExpr has been moved to the extension
constuctors, since its really GHC specific.
* HsProjection no longer has a Located DotFieldOcc as a field, but just a
regular DotFieldOcc, since DotFieldOcc already wraps a located
FieldLabelString
co-authored by: @Jade <Jade512@proton.me>
@alt-romes <rodrigo.m.mesquita@gmail.com>
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2338a971ce45ce7bc6ba2711e40966ec5ff12359">2338a971</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2024-10-11T03:53:13-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>driver: bail out when -fllvm is passed to GHC not configured with LLVM
This patch makes GHC bail out with an proper error message when it's
not configured with LLVM but users attempt to pass -fllvm, see #25011
and added comment for details.
Fixes #25011
Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78ad81ecef846f73fee0f6c1a86cd6f19aa29b21">78ad81ec</a></strong>
<div>
<span> by Cristiano Moraes </span> <i> at 2024-10-11T03:53:55-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>configure: Find C++ probing when GCC version is the latest but G++ is old #23118</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/083703a12cd34369e7ed2f0efc4a5baee47aedab">083703a1</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-10-11T03:54:32-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Consider Wanteds with rewriters as insoluble
This MR fixes #25325
See GHC.Tc.Types.Constraint, Note [Insoluble Wanteds], especially (IW2)
There is a small change in the error message for T14172, but it looks
entirely acceptable to me.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dfaeb66fb8457e7339abbd44d5c53a81ad8ae3a">0dfaeb66</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-10-11T03:54:32-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Wibbles
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09d24d828e48c2588a317e6dad711f8673983703">09d24d82</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-10-11T03:54:32-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Spelling errors
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/694489edf35c35b29fbdf09a8e3fdc404469858f">694489ed</a></strong>
<div>
<span> by sheaf </span> <i> at 2024-10-11T03:55:14-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>LLVM: use sse4.2 instead of sse42
LLVM expects the former instead of the latter since version 3.4.
Fixes #25019
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06ae85071b95376bd1eb354f7cc7901aed45b625">06ae8507</a></strong>
<div>
<span> by sheaf </span> <i> at 2024-10-11T03:55:14-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>LLVM: make SSE4.2 imply +popcnt
For consistency with the NCG as well as with Clang and GCC, we make
the SSE4.2 feature flag imply +popcnt when using the LLVM backend.
Fixes #25353
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3fe843c730a2d882af98dac53958731624dfe0a3">3fe843c7</a></strong>
<div>
<span> by Cheng Shao </span> <i> at 2024-10-11T03:55:50-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Drop obsolete libffi Makefile
This patch drops obsolete libffi Makefile from the tree, given it's
completely unused since removal of make build system in !7094.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df70405c9c37bfc17579e27beaa06820388799b0">df70405c</a></strong>
<div>
<span> by Ben Gamari </span> <i> at 2024-10-11T03:56:26-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>ghc-internal: Fix incomplete matches on IOError
As noted in #25362, these incomplete matches were previously not being
warned about. They were easily addressed by use of
`GHC.Internal.Event.Windows.withException`.
Closes #25362.
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8584504b68418eaa12f1332a22ccb7d354aacc00">8584504b</a></strong>
<div>
<span> by Matthew Pickering </span> <i> at 2024-10-11T03:57:02-04:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>compiler: Fix orientation of GHC.Hs.Doc boot file
We should be free to import things from Language.Haskell.Syntax in GHC
modules. Therefore the the boot file for the loop between ImpExp and
GHC.Hs.Doc was in the wrong place.
Issue #21592
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d660dcb6166f679b796d54c5e1983fff605bbf4b">d660dcb6</a></strong>
<div>
<span> by Sebastian Graf </span> <i> at 2024-10-11T16:38:18+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Desugaring, plus -Wincomplete-record-selectors
This commit does several related things:
* Major refactor of the handling of applications in the desugarer.
Now all applications are handled in `dsApp`, `ds_app` and related
functions. This dramatically simplifies the code and removes
complicated cruft that had accumulated. Hooray.
Fixes #25281.
* Improve the handling of -Wincomplete-record-selectors.
We now incorporate the result type of unsaturated record selector
applications as well as consider long-distance information in
getField applications.
Plus, the implmentation now builds the improved `dsApp` stuff
above, so it is much easier to understand.
Plus, incorporates improved error message wording suggested
by Adam Gundry in !12685.
Fixes #24824, #24891
See the long Note [Detecting incomplete record selectors]
* Add -Wincomplete-record-selectors to -Wall, as specified in
GHC Proposal 516.
To do this, I also had to add -Wno-incomplete-record-selectors
to the build flags for Cabal in GHC's CI. See
hadrian/src/Settings/Warnings.hs. We can remove this when
Cabal is updated so that it doesn't trigger the warning:
https://github.com/haskell/cabal/issues/10402
2.6% decrease in compile time allocation in RecordUpPerf
Metric Decrease:
RecordUpdPerf
</pre>
</li>
<li>
<strong style="font-weight: 600;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe5d8e3cfe5d3399c2c12774f444a1c7b82a3b99">fe5d8e3c</a></strong>
<div>
<span> by Simon Peyton Jones </span> <i> at 2024-10-11T16:38:25+01:00 </i>
</div>
<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #28272d; position: relative; font-family: "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;'>Elmininate incomplete record selectors
This patch is a pure refactor of GHC's source code, to avoid the use
of partial record selectors. It was provoked by adding
-Wincomplete-record-selectors to -Wall (as the GHC Proposal specified),
which in turn showed up lots of places where GHC was using incomplete
record selectors.
This patch does mostly-simple refactoring to make it clear to the pattern
match checker that there is in fact no partiality.
There is one externally-visible change: I changed the data type HoleFit
to split out the two cases
data HoleFit = TcHoleFit TcHoleFit | RawHoleFit SDoc
data TcHoleFit = HoleFit { ...lots of fields }
There are large swathes of code that just deal with `TcHoleFit`, and
having it as a separate data types makes it apparent that `RawHoleFit`
can't occur.
This makes it much better -- but the change is visible in the
HolePlugin interface. I decided that there are so few clients of this
API that it's worth the change.
I moved several functions from Language.Haskell.Syntax to GHC.Hs.
Reason, when instantiated at (GhcPass _), the extension data construtcor
is guaranteed unused, and that justifies omitted patterns in these
functions. By putting them in GHC.Hs.X I can specialise the type for
(GhcPass _) and thereby make the function total.
An interesting side-light is that there were a few local function
definitions without a type signature, like this one in GHC.Parser.Header
convImport (L _ i) = (ideclPkgQual i, reLoc $ ideclName i)
This is fully closed, and so is generalised; but that generalises
it to any old pass, not (GhcPass _), so GHC rightly complains about the
use of the selector `ideclPkgQual`. I added a type signature to `i`, thus
convImport (L _ (i::ImportDecl GhcPs))
= (ideclPkgQual i, reLoc $ ideclName i)
which specialised the function enough to make the record selector complete.
Quite a surprising consequence of local let-generalisation!
</pre>
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<h4 style="margin-top: 10px; margin-bottom: 10px;">
30 changed files:
</h4>
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compiler/GHC/Hs/Expr.hs
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<a href="#576dff4e64fa03683ffc5dcdd58284acdd70bc8e">
compiler/GHC/Hs/Extension.hs
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<a href="#9f00edfedb0f969865b049a78de3866545b4a60b">
compiler/GHC/Hs/Instances.hs
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