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<h3>
Ryan Scott pushed to branch wip/T18389
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/e2c4a94708e4d8789ce97bd8b034e62f0e8b81c6">e2c4a947</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-21T16:00:30+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser regression tests, close #12862 #12446
These issues were fixed by earlier parser changes, most likely related
to whitespace-sensitive parsing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/711929e6bcbcd5439dbf748cb57f56088b9a9f16">711929e6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-23T02:42:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix error message location in tcCheckPatSynDecl
Ticket #18856 showed that we were failing to set the right location
for an error message. Easy to fix, happily.
Turns out that this also improves the error location in test T11010,
which was bogus before but we had never noticed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/730bb59086ad1036143983c3fba61bd851bebc03">730bb590</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-23T02:43:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">cmm: Add Note reference to ForeignHint</pre>
</li>
<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/60322f930c544fabd7e68231db26e3a1fb8ed037">60322f93</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-28T21:11:39-04:00</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/c85eb3722bc68999dee023c98a8da0ffbbd89760">c85eb372</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-28T21:12:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">API Annotations: put constructors in alphabetical order
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/795908dc4eab8e8b40cb318a2adbe4a4d4126c74">795908dc</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-10-29T03:53:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Widen acceptance threshold for T10421a
Progress towards #18842. As @sgraf812 points out, widening the window is
dangerous until the exponential described in #17658 is fixed. But this
test has caused enough misery and is low stakes enough that we and
@bgamari think it's worth it in this one case for the time being.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e9f6defbdc1f691ff7197b21e68ac16ffa4ab59">0e9f6def</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-29T03:53:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split GHC.Driver.Types
I was working on making DynFlags stateless (#17957), especially by
storing loaded plugins into HscEnv instead of DynFlags. It turned out to
be complicated because HscEnv is in GHC.Driver.Types but LoadedPlugin
isn't: it is in GHC.Driver.Plugins which depends on GHC.Driver.Types. I
didn't feel like introducing yet another hs-boot file to break the loop.
Additionally I remember that while we introduced the module hierarchy
(#13009) we talked about splitting GHC.Driver.Types because it contained
various unrelated types and functions, but we never executed. I didn't
feel like making GHC.Driver.Types bigger with more unrelated Plugins
related types, so finally I bit the bullet and split GHC.Driver.Types.
As a consequence this patch moves a lot of things. I've tried to put
them into appropriate modules but nothing is set in stone.
Several other things moved to avoid loops.
* Removed Binary instances from GHC.Utils.Binary for random compiler
things
* Moved Typeable Binary instances into GHC.Utils.Binary.Typeable: they
import a lot of things that users of GHC.Utils.Binary don't want to
depend on.
* put everything related to Units/Modules under GHC.Unit:
GHC.Unit.Finder, GHC.Unit.Module.{ModGuts,ModIface,Deps,etc.}
* Created several modules under GHC.Types: GHC.Types.Fixity, SourceText,
etc.
* Split GHC.Utils.Error (into GHC.Types.Error)
* Finally removed GHC.Driver.Types
Note that this patch doesn't put loaded plugins into HscEnv. It's left
for another patch.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22f5d9a951dbc9cfdf55984c5e2a6fad28a6f650">22f5d9a9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-29T03:53:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GC: Avoid data race (#18717, #17964)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ef2fac4c412a25fa64f79b759d69d22a4ebc784">2ef2fac4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-10-29T04:18:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Check for large tuples more thoroughly
This fixes #18723 by:
* Moving the existing `GHC.Tc.Gen.HsType.bigConstraintTuple` validity
check to `GHC.Rename.Utils.checkCTupSize` for consistency with
`GHC.Rename.Utils.checkTupSize`, and
* Using `check(C)TupSize` when checking tuple _types_, in addition
to checking names, expressions, and patterns.
Note that I put as many of these checks as possible in the typechecker so
that GHC can properly distinguish between boxed and constraint tuples. The
exception to this rule is checking names, which I perform in the renamer
(in `GHC.Rename.Env`) so that we can rule out `(,, ... ,,)` and
`''(,, ... ,,)` alike in one fell swoop.
While I was in town, I also removed the `HsConstraintTuple` and
`HsBoxedTuple` constructors of `HsTupleSort`, which are functionally
unused. This requires a `haddock` submodule bump.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f8be3eb3440a152246a1aef7b4020be4c03cf2e">7f8be3eb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-10-29T22:08:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unnecessary gender from comments/docs
While, say, alternating "he" and "she" in sequential writing
may be nicer than always using "they", reading code/documentation
is almost never sequential. If this small change makes individuals
feel more welcome in GHC's codebase, that's a good thing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9902d9ec95dfc3ddb3e8a703de6b000c3ac3871a">9902d9ec</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-10-30T05:28:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] Fix typo in `callocBytes` haddock.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31fcb55f4ff8c06c5ab100a6817cae8b571295a9">31fcb55f</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-10-30T18:52:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split HsConDecl{H98,GADT}Details
Haskell98 and GADT constructors both use `HsConDeclDetails`, which includes
`InfixCon`. But `InfixCon` is never used for GADT constructors, which results
in an awkward unrepresentable state. This removes the unrepresentable state by:
* Renaming the existing `HsConDeclDetails` synonym to `HsConDeclH98Details`,
which emphasizes the fact that it is now only used for Haskell98-style data
constructors, and
* Creating a new `HsConDeclGADTDetails` data type with `PrefixConGADT` and
`RecConGADT` constructors that closely resemble `PrefixCon` and `InfixCon`
in `HsConDeclH98Details`. The key difference is that `HsConDeclGADTDetails`
lacks any way to represent infix constructors.
The rest of the patch is refactoring to accommodate the new structure of
`HsConDecl{H98,GADT}Details`. Some highlights:
* The `getConArgs` and `hsConDeclArgTys` functions have been removed, as
there is no way to implement these functions uniformly for all
`ConDecl`s. For the most part, their previous call sites now
pattern match on the `ConDecl`s directly and do different things for
`ConDeclH98`s and `ConDeclGADT`s.
I did introduce one new function to make the transition easier:
`getRecConArgs_maybe`, which extracts the arguments from a `RecCon(GADT)`.
This is still possible since `RecCon(GADT)`s still use the same representation
in both `HsConDeclH98Details` and `HsConDeclGADTDetails`, and since the
pattern that `getRecConArgs_maybe` implements is used in several places,
I thought it worthwhile to factor it out into its own function.
* Previously, the `con_args` fields in `ConDeclH98` and `ConDeclGADT` were
both of type `HsConDeclDetails`. Now, the former is of type
`HsConDeclH98Details`, and the latter is of type `HsConDeclGADTDetails`,
which are distinct types. As a result, I had to rename the `con_args` field
in `ConDeclGADT` to `con_g_args` to make it typecheck.
A consequence of all this is that the `con_args` field is now partial, so
using `con_args` as a top-level field selector is dangerous. (Indeed, Haddock
was using `con_args` at the top-level, which caused it to crash at runtime
before I noticed what was wrong!) I decided to add a disclaimer in the 9.2.1
release notes to advertise this pitfall.
Fixes #18844. Bumps the `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9fd0f0f98706e4eda4657c014ed69e5a9afc57e">b9fd0f0f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-30T19:58:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Work in progress on #18359
Joint work between Richard, Simon, Ryan
</pre>
</li>
</ul>
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compiler/GHC.hs
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compiler/GHC/Builtin/PrimOps.hs
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/Types/Prim.hs
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compiler/GHC/Core/Opt/Simplify.hs
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<li class="file-stats">
<a href="#b6a5ba32bafb8fbda933538b3007e755fef6f101">
compiler/GHC/Core/Opt/SpecConstr.hs
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<li class="file-stats">
<a href="#ab22d7ae4d245581b701367e386d7e886e416e76">
compiler/GHC/Core/Opt/Specialise.hs
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<a href="#5b215b0e109123e4bef5434854f18e2f61c45b88">
compiler/GHC/Core/Opt/WorkWrap.hs
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<a href="#a211015aa309fa844161702f7e5695c71036c8b6">
<span class="deleted-file">
−
compiler/GHC/Core/PatSyn.hs-boot
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<li class="file-stats">
<a href="#379343fa560df0c7451aa5a1dd4f074dd37924d0">
compiler/GHC/Core/TyCo/Ppr.hs
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<li class="file-stats">
<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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</ul>
<h5>The diff was not included because it is too large.</h5>
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