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<h3>
Marge Bot pushed to branch wip/marge_bot_batch_merge_job
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/9ad51bc9d2ad9168abad271f715ce73d3562218a">9ad51bc9</a></strong>
<div>
<span>by David Beacham</span>
<i>at 2020-10-27T13:59:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix `instance Bounded a => Bounded (Down a)` (#18716)
* Flip `minBound` and `maxBound` to respect the change in ordering
* Remove awkward `Enum` (and hence `Integral`) instances for
`Data.Ord.Down`
* Update changelog
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eedec53df8bf030b36cdd1fcfd1ff06041bc46fd">eedec53d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-27T14:00:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Version bump: base-4.16 (#18712)
Also bumps upper bounds on base in boot libraries (incl. submodules).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/412018c1214a19649e0ccfff73e80a0622635dd5">412018c1</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-27T14:00:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: simplify logic remove optimization step.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4950dd075ce79e13d24362d669e134ed5a4ddec7">4950dd07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-27T14:01:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Suppress xelatex output unless it fails
As noted in #18835, xelatex produces an absurd amount of output, nearly
all of which is meaningless. Silence this.
Fixes #18835.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3d8ab2ef6ffe30ec91c795e0223392dd96ea61a">f3d8ab2e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-27T14:02:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">build system: Clean mingw tarballs
Tamar noticed in !4293 that the build systems fail to clean up the mingw
tarballs directory (`ghc-tarballs`). Fix this in both the make build
system and Hadrian.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b3d23afcad8bc14f2ba69b8dbe05c314e6e7b29">0b3d23af</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-27T14:02:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two constraint solving problems
This patch fixes two problems in the constraint solver.
* An actual bug #18555: we were floating out a constraint to eagerly,
and that was ultimately fatal. It's explained in
Note [Do not float blocked constraints] in GHC.Core.Constraint.
This is all very delicate, but it's all going to become irrelevant
when we stop floating constraints (#17656).
* A major performance infelicity in the flattener. When flattening
(ty |> co) we *never* generated Refl, even when there was nothing
at all to do. Result: we would gratuitously rewrite the constraint
to exactly the same thing, wasting work. Described in #18413, and
came up again in #18855.
Solution: exploit the special case by calling the new function
castCoercionKind1. See Note [castCoercionKind1] in
GHC.Core.Coercion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f76c5a083edc62bb40efbb0e76e8a3bf50ead765">f76c5a08</a></strong>
<div>
<span>by Sergei Trofimovich</span>
<i>at 2020-10-27T14:03:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc.mk: amend 'make sdist'
Noticed 'make sdist' failure seen as:
```
"rm" -rf sdistprep/ghc/ghc-9.1.0.20201020/hadrian/_build/ (SRC_DIST_GHC_DIR)/hadrian/dist-newstyle/
/bin/sh: -c: line 0: syntax error near unexpected token `('
```
commit 9657f6f34
("sdist: Include hadrian sources in source distribution")
added a new cleanup path without a variable expantion.
The change adds variable reference. While at it move directory
cleanup to a separate statement.
Amends #18794
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78b52c888a1cc68750261382e3a62fff65242016">78b52c88</a></strong>
<div>
<span>by David Eichmann</span>
<i>at 2020-10-27T14:03:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use config.run_ways for multi_compile_and_run tests
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3fdd4197cd9def4af40acb3753843e3e9a74d7e">e3fdd419</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-27T14:04:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Api Annotations: Introduce AnnPercent for HsExplicitMult
For the case
foo :: a %p -> b
The location of the '%' is captured, separate from the 'p'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2a25f42f884ad4ac841a36474498131596da506">d2a25f42</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-27T14:05:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump ci-images
Bumps bootstrap compiler to 8.10.1.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28f98b01d055c8027f9495b1669bf875b3e42168">28f98b01</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-27T14:05:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Kill `is_thunk` case in `splitFV`
The `splitFV` function implements the highly dubious hack
described in `Note [Lazy und unleashable free variables]` in
GHC.Core.Opt.DmdAnal. It arranges it so that demand signatures only
carry strictness info on free variables. Usage info is released through
other means, see the Note. It's purely for analysis performance reasons.
It turns out that `splitFV` has a quite involved case for thunks that
produces slightly different usage signatures and it's not clear why we
need it: `splitFV` is only relevant in the LetDown case and the only
time we call it on thunks is for top-level or local recursive thunks.
Since usage signatures of top-level thunks can only reference other
top-level bindings and we completely discard demand info we have on
top-level things (see the lack of `setIdDemandInfo` in
`dmdAnalTopBind`), the `is_thunk` case is completely irrelevant here.
For local, recursive thunks, the added benefit of the `is_thunk` test
is marginal: We get used-multiple-times in some cases where previously
we had used-once if a recursive thunk has multiple call sites. It's
very unlikely and not a case to optimise for.
So we kill the `is_thunk` case and inline `splitFV` at its call site,
exposing `isWeakDmd` from `GHC.Types.Demand` instead.
The NoFib summary supports this decision:
```
Min 0.0% -0.0%
Max 0.0% +0.0%
Geometric Mean -0.0% -0.0%
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e85eebbab573cfd8010d767e28e3c7225c055062">e85eebba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-28T09:41:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't quote metric baseline argument
Previously this was quoted inappropriately.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b159d5b97f5eedecfb0dfcb241a9da54ec8c175d">b159d5b9</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-28T09:41:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">API Annotations: put constructors in alphabetical order
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e">
compiler/GHC/Core/FamInstEnv.hs
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<a href="#8104fa1b71db6cfc4eb90cd769463d9eb9004619">
compiler/GHC/Core/Opt/DmdAnal.hs
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<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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compiler/GHC/Parser.y
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compiler/GHC/Parser/Annotation.hs
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compiler/GHC/Parser/PostProcess.hs
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compiler/GHC/Tc/Solver.hs
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<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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compiler/ghc.cabal.in
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ghc.mk
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hadrian/hadrian.cabal
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hadrian/src/Builder.hs
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hadrian/src/Rules/Clean.hs
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hadrian/src/Settings/Builders/RunTest.hs
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<a href="#9291b31007e89e8b38b9ca916cdad6f71073b937">
libraries/array
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libraries/base/Data/Ord.hs
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libraries/base/GHC/Event/Windows.hsc
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libraries/base/base.cabal
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libraries/base/changelog.md
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libraries/deepseq
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libraries/directory
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libraries/filepath
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libraries/ghc-boot-th/ghc-boot-th.cabal.in
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libraries/ghc-boot/ghc-boot.cabal.in
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libraries/ghc-compact/ghc-compact.cabal
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libraries/ghci/ghci.cabal.in
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