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<h3>
Ryan Scott pushed to branch wip/T18714-T18715
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0799b3de3e3462224bddc0e4b6a3156d04a06361">0799b3de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-18T15:55:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/nonmoving: Add missing STM write barrier
When updating a TRec for a TVar already part of a transaction we
previously neglected to add the old value to the update remembered set.
I suspect this was the cause of #18587.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c492134912e5270180881b7345ee86dc32756bdd">c4921349</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-18T15:56:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Refactor foreign export tracking
This avoids calling `libc` in the initializers which are responsible for
registering foreign exports. We believe this should avoid the corruption
observed in #18548.
See Note [Tracking foreign exports] in rts/ForeignExports.c for an
overview of the new scheme.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40dc91069d15bfc1d81f1722b39e06cac8fdddd1">40dc9106</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-18T15:56:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Refactor unloading of foreign export StablePtrs
Previously we would allocate a linked list cell for each foreign export.
Now we can avoid this by taking advantage of the fact that they are
already broken into groups.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/45fa82182bc61e3966fd51496c35130cd067a5df">45fa8218</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-09-19T06:57:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deprecate Data.Semigroup.Option
Libraries email: https://mail.haskell.org/pipermail/libraries/2018-April/028724.html
GHC issue: https://gitlab.haskell.org/ghc/ghc/issues/15028
Corresponding PRs for deepseq:
* https://github.com/haskell/deepseq/pull/55
* https://github.com/haskell/deepseq/pull/57
Bumps the deepseq submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2229d570fc78867190febb4f13c799b258a41f6d">2229d570</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-19T15:47:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Require happy >=1.20
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a89c2fbab9bcf7d769e9d27262ab29f93342f114">a89c2fba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-19T15:47:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci.sh: Enforce minimum happy/alex versions
Also, always invoke cabal-install to ensure that happy/alex symlinks are
up-to-date.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f7ef2fb3234cdfb89b3da1298fc9c1b7381e418">2f7ef2fb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-19T15:47:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Ensure that cabal-install overwrites existing executables
Previously cabal-install wouldn't overwrite toolchain executables if
they already existed (as they likely would due to caching).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac213d267140e747a391f68bc9f060e117395547">ac213d26</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-19T15:48:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wire in constraint tuples
This wires in the definitions of the constraint tuple classes. The
key changes are in:
* `GHC.Builtin.Types`, where the `mk_ctuple` function is used to
define constraint tuple type constructors, data constructors, and
superclass selector functions, and
* `GHC.Builtin.Uniques`. In addition to wiring in the `Unique`s for
constraint tuple type and data constructors, we now must wire in
the superclass selector functions. Luckily, this proves to be not
that challenging. See the newly added comments.
Historical note: constraint tuples used to be wired-in until about
five years ago, when commit 130e93aab220bdf14d08028771f83df210da340b
turned them into known-key names. This was done as part of a larger
refactor to reduce the number of special cases for constraint tuples,
but the commit message notes that the main reason that constraint
tuples were made known-key (as opposed to boxed/unboxed tuples, which
are wired in) is because it was awkward to wire in the superclass
selectors. This commit solves the problem of wiring in superclass
selectors.
Fixes #18635.
-------------------------
Metric Decrease:
T10421
T12150
T12227
T12234
T12425
T13056
T13253-spj
T18282
T18304
T5321FD
T5321Fun
T5837
T9961
Metric Decrease (test_env='x86_64-linux-deb9-unreg-hadrian'):
T12707
Metric Decrease (test_env='x86_64-darwin'):
T4029
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e195dae6d959e2a9b1a22a2ca78db5955e1d7dea">e195dae6</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-19T15:48:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export singleton function from Data.List
Data.OldList exports a monomorphized singleton function but
it is not re-exported by Data.List. Adding the export to
Data.List causes a conflict with a 14-year old function of the
same name and type by SPJ in GHC.Utils.Misc. We can't just remove
this function because that leads to a problems when building
GHC with a stage0 compiler that does not have singleton in
Data.List yet. We also can't hide the function in GHC.Utils.Misc
since it is not possible to hide a function from a module if the
module does not export the function. To work around this, all
places where the Utils.Misc singleton was used now use a qualified
version like Utils.singleton and in GHC.Utils.Misc we are very
specific about which version we export.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c1b8ad931e7bfabe521bc17e74ac9869b21a748">9c1b8ad9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-19T15:49:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Stack resolver
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d05d13ce6b5be54f3aa1c23f4377920a4965fc50">d05d13ce</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-09-19T15:49:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cinch -fno-warn-name-shadowing down to specific GHCi module
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1accd00969e0b2993f14ee4ed858cea0c13357e">f1accd00</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-19T15:49:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add quick-validate Hadrian flavour (quick + -Werror)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f8d51f137ffcdbc4432febc5d1a11a564807b1b">8f8d51f1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-09-19T15:50:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix docs who misstated how the RTS treats size suffixes.
They are parsed as multiples of 1024. Not 1000. The docs
used to imply otherwise.
See decodeSize in rts/RtsFlags.c for the logic for this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ae0edbdfaf920d0c4da4edf721b947e11eb054c">2ae0edbd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-09-19T15:50:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a codeblock in ghci.rst
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4df3aa956260e3d84232f43546e297cf425081dd">4df3aa95</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-19T15:51:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Fix various documentation issues
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/885ecd18e084e4e2b15fbc5de0aa5222f2573387">885ecd18</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-19T15:51:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fail on Sphinx syntax errors
Specifically the "Inline literal start-string without end-string"
warning, which typically means that the user neglected to separate
an inline code block from suffix text with a backslash.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b26cd86795d86850bfa97aa020d0a46b8ac043da">b26cd867</a></strong>
<div>
<span>by David Feuer</span>
<i>at 2020-09-19T15:51:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unpack the MVar in Compact
The `MVar` lock in `Compact` was unnecessarily lazy, creating an extra indirection and wasting two words. Make it strict.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/760307cf5511d970dfddf7fa4b502b4e3394b197">760307cf</a></strong>
<div>
<span>by Artyom Kuznetsov</span>
<i>at 2020-09-19T15:52:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GADT self-reference check (#11554, #12081, #12174, fixes #15942)
Reverts 430f5c84dac1eab550110d543831a70516b5cac8
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/057db94ce038970b14df1599fe83097c284b9c1f">057db94c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-19T15:52:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Drop field initializer on thread_basic_info_data_t
This struct has a number of fields and we only care that the value is
initialized with zeros. This eliminates the warnings noted in #17905.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b7e9dc0324ce36c34c6e2c179b885c5bccb16ab4">b7e9dc03</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-20T06:55:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused ThBrackCtxt and ResSigCtxt
Fixes #18715.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a963b80945206584855af44d42c04f2db78d23ea">a963b809</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-20T07:34:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disallow constraints in KindSigCtxt
This patch cleans up how `GHC.Tc.Validity` classifies `UserTypeCtxt`s
that can only refer to kind-level positions, which is important for
rejecting certain classes of programs. In particular, this patch:
* Introduces a new `TypeOrKindCtxt` data type and
`typeOrKindCtxt :: UserTypeCtxt -> TypeOrKindCtxt` function, which
determines whether a `UserTypeCtxt` can refer to type-level
contexts, kind-level contexts, or both.
* Defines the existing `allConstraintsAllowed` and `vdqAllowed`
functions in terms of `typeOrKindCtxt`, which avoids code
duplication and ensures that they stay in sync in the future.
The net effect of this patch is that it fixes #18714, in which it was
discovered that `allConstraintsAllowed` incorrectly returned `True`
for `KindSigCtxt`. Because `typeOrKindCtxt` now correctly classifies
`KindSigCtxt` as a kind-level context, this bug no longer occurs.
</pre>
</li>
</ul>
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<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
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aclocal.m4
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/Uniques.hs
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compiler/GHC/Builtin/Utils.hs
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hadrian/hadrian.cabal
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