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<h3>
Ben Gamari pushed to branch wip/tsan/storage
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/ca48076ae866665913b9c81cbc0c76f0afef7a00">ca48076a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-17T20:04:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce OutputableP
Some types need a Platform value to be pretty-printed: CLabel, Cmm
types, instructions, etc.
Before this patch they had an Outputable instance and the Platform value
was obtained via sdocWithDynFlags. It meant that the *renderer* of the
SDoc was responsible of passing the appropriate Platform value (e.g. via
the DynFlags given to showSDoc). It put the burden of passing the
Platform value on the renderer while the generator of the SDoc knows the
Platform it is generating the SDoc for and there is no point passing a
different Platform at rendering time.
With this patch, we introduce a new OutputableP class:
class OutputableP a where
pdoc :: Platform -> a -> SDoc
With this class we still have some polymorphism as we have with `ppr`
(i.e. we can use `pdoc` on a variety of types instead of having a
dedicated `pprXXX` function for each XXX type).
One step closer removing `sdocWithDynFlags` (#10143) and supporting
several platforms (#14335).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e45c85446de7589e17acf5654c2b33f766043eb1">e45c8544</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-17T20:04:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalize OutputableP
Add a type parameter for the environment required by OutputableP. It
avoids tying Platform with OutputableP.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37aa224ad5b1cfb17d472c7b88c5c76bf22a52f3">37aa224a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-17T20:04:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add note about OutputableP
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f2785f2d6c6947d22d4d8b71d205c7c4b025680">7f2785f2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-17T20:04:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove pprPrec from Outputable (unused)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b689f3db0229ac58af5383796fb13c6d40e358ce">b689f3db</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-17T20:04:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add clamping naturalToWord (fix #18697)
</pre>
</li>
<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/87e2e2b17afed82d30841d5b44c977123b93ecc4">87e2e2b1</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-19T23:55:30+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Resolve shift/reduce conflicts with %shift (#17232)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66cba46e7049d907fe5c8614bddb60288421d358">66cba46e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Unmark T12971 as broken on Windows
It's unclear why, but this no longer seems to fail.
Closes #17945.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/816811d45897afec3543ade30c63dcddf56828a8">816811d4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Unmark T5975[ab] as broken on Windows
Sadly it's unclear *why* they have suddenly started working.
Closes #7305.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43a43d396e30931c1fa68b054ae032d2bd1daa98">43a43d39</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base/testsuite: Add missing LANGUAGE pragma in ThreadDelay001
Only affected the Windows codepath.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ced8f113cc6421dfc36dd322ea85a78bfa3ff37e">ced8f113</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output for outofmem on Windows
The error originates from osCommitMemory rather than getMBlocks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea08aead19087d21c5f7334e192cd4016ae57462">ea08aead</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark some GHCi/Makefile tests as broken on Windows
See #18718.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/caf6a5a30291d80660d6ff73efc35c04eaced789">caf6a5a3</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix WinIO error message normalization
This wasn't being applied to stderr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93ab3e8d235610b2cb339a5bad9ad2848eab18d4">93ab3e8d</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark tempfiles as broken on Win32 without WinIO
The old POSIX emulation appears to ignore the user-requested prefix.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9df77fed8918bb335874a584a829ee32325cefb5">9df77fed</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-20T20:30:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark TH_spliceE5_prof as broken on Windows
Due to #18721.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1a0f8243efc9873a949bb6f082b4dfdf563fc1ea">1a0f8243</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-21T16:45:47-04:00</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/2f222b120e48df1b3d78f5501612d21c2a2dc470">2f222b12</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-21T16:45:47-04:00</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>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aaa51dcfdb729f130aeefeaeac15029b62096a74">aaa51dcf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-21T16:46:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add extra-deps: happy-1.20 to stack.yaml
GHC now requires happy-1.20, which isn't available in LTS-16.14.
Fixes #18726.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6de40f83c53c3b1899f7b4912badbe98e4fbde88">6de40f83</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-22T05:37:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Better eta-expansion (again) and don't specilise DFuns
This patch fixes #18223, which made GHC generate an exponential
amount of code. There are three quite separate changes in here
1. Re-engineer eta-expansion (again). The eta-expander was
generating lots of intermediate stuff, which could be optimised
away, but which choked the simplifier meanwhile. Relatively
easy to kill it off at source.
See Note [The EtaInfo mechanism] in GHC.Core.Opt.Arity.
The main new thing is the use of pushCoArg in getArg_maybe.
2. Stop Specialise specalising DFuns. This is the cause of a huge
(and utterly unnecessary) blowup in program size in #18223.
See Note [Do not specialise DFuns] in GHC.Core.Opt.Specialise.
I also refactored the Specialise monad a bit... it was silly,
because it passed on unchanging values as if they were mutable
state.
3. Do an extra Simplifer run, after SpecConstra and before
late-Specialise. I found (investigating perf/compiler/T16473)
that failing to do this was crippling *both* SpecConstr *and*
Specialise. See Note [Simplify after SpecConstr] in
GHC.Core.Opt.Pipeline.
This change does mean an extra run of the Simplifier, but only
with -O2, and I think that's acceptable.
T16473 allocates *three* times less with this change. (I changed
it to check runtime rather than compile time.)
Some smaller consequences
* I moved pushCoercion, pushCoArg and friends from SimpleOpt
to Arity, because it was needed by the new etaInfoApp.
And pushCoValArg now returns a MCoercion rather than Coercion for
the argument Coercion.
* A minor, incidental improvement to Core pretty-printing
This does fix #18223, (which was otherwise uncompilable. Hooray. But
there is still a big intermediate because there are some very deeply
nested types in that program.
Modest reductions in compile-time allocation on a couple of benchmarks
T12425 -2.0%
T13253 -10.3%
Metric increase with -O2, due to extra simplifier run
T9233 +5.8%
T12227 +1.8%
T15630 +5.0%
There is a spurious apparent increase on heap residency on T9630,
on some architectures at least. I tried it with -G1 and the residency
is essentially unchanged.
Metric Increase
T9233
T12227
T9630
Metric Decrease
T12425
T13253
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/416bd50e58b23ad70813b18a913ca77a3ab6e936">416bd50e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-22T05:37:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the occurrence analyser
Ticket #18603 demonstrated that the occurrence analyser's
handling of
local RULES for imported Ids
(which I now call IMP-RULES) was inadequate. It led the simplifier
into an infnite loop by failing to label a binder as a loop breaker.
The main change in this commit is to treat IMP-RULES in a simple and
uniform way: as extra rules for the local binder. See
Note [IMP-RULES: local rules for imported functions]
This led to quite a bit of refactoring. The result is still tricky,
but it's much better than before, and better documented I think.
Oh, and it fixes the bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6fe8a0c756f8b12df5cf192ea9b0c33feb150843">6fe8a0c7</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-22T05:38:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck - Comments only: Replace /~ by ≁
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e9501547a8be6af97bcbf38a7ed66dadf02ea27b">e9501547</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-22T05:38:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Rewrite inhabitation test
We used to produce inhabitants of a pattern-match refinement type Nabla
in the checker in at least two different and mostly redundant ways:
1. There was `provideEvidence` (now called
`generateInhabitingPatterns`) which is used by
`GHC.HsToCore.PmCheck` to produce non-exhaustive patterns, which
produces inhabitants of a Nabla as a sub-refinement type where all
match variables are instantiated.
2. There also was `ensure{,All}Inhabited` (now called
`inhabitationTest`) which worked slightly different, but was
whenever new type constraints or negative term constraints were
added. See below why `provideEvidence` and `ensureAllInhabited`
can't be the same function, the main reason being performance.
3. And last but not least there was the `nonVoid` test, which tested
that a given type was inhabited. We did use this for strict fields
and -XEmptyCase in the past.
The overlap of (3) with (2) was always a major pet peeve of mine. The
latter was quite efficient and proven to work for recursive data types,
etc, but could not handle negative constraints well (e.g. we often want
to know if a *refined* type is empty, such as `{ x:[a] | x /= [] }`).
Lower Your Guards suggested that we could get by with just one, by
replacing both functions with `inhabitationTest` in this patch.
That was only possible by implementing the structure of φ constraints
as in the paper, namely the semantics of φ constructor constraints.
This has a number of benefits:
a. Proper handling of unlifted types and strict fields, fixing #18249,
without any code duplication between
`GHC.HsToCore.PmCheck.Oracle.instCon` (was `mkOneConFull`) and
`GHC.HsToCore.PmCheck.checkGrd`.
b. `instCon` can perform the `nonVoid` test (3) simply by emitting
unliftedness constraints for strict fields.
c. `nonVoid` (3) is thus simply expressed by a call to
`inhabitationTest`.
d. Similarly, `ensureAllInhabited` (2), which we called after adding
type info, now can similarly be expressed as the fuel-based
`inhabitationTest`.
See the new `Note [Why inhabitationTest doesn't call generateInhabitingPatterns]`
why we still have tests (1) and (2).
Fixes #18249 and brings nice metric decreases for `T17836` (-76%) and
`T17836b` (-46%), as well as `T18478` (-8%) at the cost of a few very
minor regressions (< +2%), potentially due to the fact that
`generateInhabitingPatterns` does more work to suggest the minimal
COMPLETE set.
Metric Decrease:
T17836
T17836b
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/086ef01813069fad84cafe81cab37527d41c8568">086ef018</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-09-23T06:52:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove the list of loaded modules from the ghci prompt
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7385f7077c6258c2a76ae51b4ea80f6fa9c7015">d7385f70</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-23T06:52:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump submodules
* Bump bytestring to 0.10.12.0
* Bump Cabal to 3.4.0.0-rc3
* Bump Win32 to 2.10.0.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/667d63558a694e12974ace723b553950f6080365">667d6355</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-23T20:43:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CLabel pretty-printing
* Don't depend on the selected backend to know if we print Asm or C
labels: we already have PprStyle to determine this. Moreover even when
a native backend is used (NCG, LLVM) we may want to C headers
containing pretty-printed labels, so it wasn't a good predicate
anyway.
* Make pretty-printing code clearer and avoid partiality
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a584366b1d363039247f73f6dcdd3514994ad600">a584366b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-23T20:43:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove sdocWithDynFlags (fix #10143)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a997fa01d907fc1992dc8c3ebc73f98e7a1486f7">a997fa01</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-23T20:43:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preliminary work towards removing DynFlags -> Driver.Ppr dependency
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31fea307499009977fdf3dadedc98cfef986077a">31fea307</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-09-23T20:44:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant "do", "return" and language extensions from base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04d6433158d95658684cf419c4ba5725d2aa539e">04d64331</a></strong>
<div>
<span>by syd@cs-syd.eu</span>
<i>at 2020-09-24T13:15:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Lock.hs with more documentation to make sure that the Boolean return value is clear.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97cff9190d346c3b51c32c88fd145fcf1e6678f1">97cff919</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-24T13:16:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement Quick Look impredicativity
This patch implements Quick Look impredicativity (#18126), sticking
very closely to the design in
A quick look at impredicativity, Serrano et al, ICFP 2020
The main change is that a big chunk of GHC.Tc.Gen.Expr has been
extracted to two new modules
GHC.Tc.Gen.App
GHC.Tc.Gen.Head
which deal with typechecking n-ary applications, and the head of
such applications, respectively. Both contain a good deal of
documentation.
Three other loosely-related changes are in this patch:
* I implemented (partly by accident) points (2,3)) of the accepted GHC
proposal "Clean up printing of foralls", namely
https://github.com/ghc-proposals/ghc-proposals/blob/
master/proposals/0179-printing-foralls.rst
(see #16320).
In particular, see Note [TcRnExprMode] in GHC.Tc.Module
- :type instantiates /inferred/, but not /specified/, quantifiers
- :type +d instantiates /all/ quantifiers
- :type +v is killed off
That completes the implementation of the proposal,
since point (1) was done in
commit df08468113ab46832b7ac0a7311b608d1b418c4d
Author: Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io>
Date: Mon Feb 3 21:17:11 2020 +0100
Always display inferred variables using braces
* HsRecFld (which the renamer introduces for record field selectors),
is now preserved by the typechecker, rather than being rewritten
back to HsVar. This is more uniform, and turned out to be more
convenient in the new scheme of things.
* The GHCi debugger uses a non-standard unification that allows the
unification variables to unify with polytypes. We used to hack
this by using ImpredicativeTypes, but that doesn't work anymore
so I introduces RuntimeUnkTv. See Note [RuntimeUnkTv] in
GHC.Runtime.Heap.Inspect
Updates haddock submodule.
WARNING: this patch won't validate on its own. It was too
hard to fully disentangle it from the following patch, on
type errors and kind generalisation.
Changes to tests
* Fixes #9730 (test added)
* Fixes #7026 (test added)
* Fixes most of #8808, except function `g2'` which uses a
section (which doesn't play with QL yet -- see #18126)
Test added
* Fixes #1330. NB Church1.hs subsumes Church2.hs, which is now deleted
* Fixes #17332 (test added)
* Fixes #4295
* This patch makes typecheck/should_run/T7861 fail.
But that turns out to be a pre-existing bug: #18467.
So I have just made T7861 into expect_broken(18467)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9fa26aa16f9eee0b56b5d9e65c16367d7b789996">9fa26aa1</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-24T13:16:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve kind generalisation, error messages
This patch does two things:
* It refactors GHC.Tc.Errors a bit. In debugging Quick Look I was
forced to look in detail at error messages, and ended up doing a bit
of refactoring, esp in mkTyVarEqErr'. It's still quite a mess, but
a bit better, I think.
* It makes a significant improvement to the kind checking of type and
class declarations. Specifically, we now ensure that if kind
checking fails with an unsolved constraint, all the skolems are in
scope. That wasn't the case before, which led to some obscure error
messages; and occasional failures with "no skolem info" (eg #16245).
Both of these, and the main Quick Look patch itself, affect a /lot/ of
error messages, as you can see from the number of files changed. I've
checked them all; I think they are as good or better than before.
Smaller things
* I documented the various instances of VarBndr better.
See Note [The VarBndr tyep and its uses] in GHC.Types.Var
* Renamed GHC.Tc.Solver.simpl_top to simplifyTopWanteds
* A bit of refactoring in bindExplicitTKTele, to avoid the
footwork with Either. Simpler now.
* Move promoteTyVar from GHC.Tc.Solver to GHC.Tc.Utils.TcMType
Fixes #16245 (comment 211369), memorialised as
typecheck/polykinds/T16245a
Also fixes the three bugs in #18640
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d0ce0eb772bf69c57e14f30c16c606ab5035816">6d0ce0eb</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-24T13:17:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Desugar string literal patterns with -XRebindableSyntax correctly (#18708)
Fixes #18708.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/007940d2fa1ac4f8046989d4af1d088914612a78">007940d2</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-09-24T13:17:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Namespace the Hadrian linting rule for base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b72718953c289b6827e877e14d9f0f3f5c64267">5b727189</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-09-25T21:10:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sizeExpr strict in the size threshold to facilitate WW.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd6640316865d84075b00013b8b97076705e5c44">dd664031</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-25T21:10:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci.sh: Factor out common utilities
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b78e8658c3f5042967cbe9d30a5a630946c4fd7">5b78e865</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-25T21:10:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci: Add ad-hoc performance testing rule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29885f076219d878d2c976e78b7960a1a5938a96">29885f07</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-09-25T21:11:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Stop removing definitions of record fields in GHC.Iface.Ext.Ast
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d6519d9e8604d067f4a4f760e4bc3403727a498">0d6519d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-25T21:12:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop Darwin cleanup job
We now have a proper periodic clean-up script installed on the runners.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/277d20af1ce54c7e2c76dfe3b96c54babceeea41">277d20af</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-25T21:12:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression tests for #18371
They have been fixed by !3959, I believe.
Fixes #18371.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8edf60562720b91613a6ad6b949ae08416f81c9a">8edf6056</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-25T21:12:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a regression test for #18609
The egregious performance hits are gone since !4050.
So we fix #18609.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a1b89a40d553213c9722207608a07f8a4c07545">4a1b89a4</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-25T21:12:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept new test output for #17218
The expected test output was plain wrong.
It has been fixed for a long time.
Thus we can close #17218.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/516062366ed1957e499f27dfc6b685a073a18400">51606236</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-09-25T21:13:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print RET_BIG stack closures
A RET_BIG closure has a large bitmap that describes it's payload and can
be printed with printLargeBitmap().
Additionally, the output for payload closures of small and big bitmaps is
changed: printObj() is used to print a bit more information about what's
on the stack.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357">2707c4ea</a></strong>
<div>
<span>by Arnaud Spiwack</span>
<i>at 2020-09-25T21:13:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pattern guards BindStmt always use multiplicity Many
Fixes #18439 .
The rhs of the pattern guard was consumed with multiplicity one, while
the pattern assumed it was Many. We use Many everywhere instead.
This is behaviour consistent with that of `case` expression. See #18738.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92daad241bf136a10346ecbf520d62921c82bf7d">92daad24</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-25T21:14:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: refactor backend modules
* move backends into GHC.Num.Backend.*
* split backend selection into GHC.Num.Backend and
GHC.Num.Backend.Selected to avoid duplication with the Check backend
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04bc50b3c8e40387a0d0f090ea23cd68923f1834">04bc50b3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-25T21:14:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: implement extended GCD (#18427)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a7dae4badcea5b3519005cf4e5fbf15f7e5df59">6a7dae4b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-25T21:15:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typed holes causing linearity errors (#18491)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83407ffc7acc00cc025b9f6ed063add9ab9f9bcc">83407ffc</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-25T21:15:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Various documentation fixes
* Remove UnliftedFFITypes from conf. Some time ago, this extension
was undocumented and we had to silence a warning.
This is no longer needed.
* Use r'' in conf.py. This fixes a Sphinx warning:
WARNING: Support for evaluating Python 2 syntax is deprecated and will be removed in Sphinx 4.0. Convert docs/users_guide/conf.py to Python 3 syntax.
* Mark GHCForeignImportPrim as documented
* Fix formatting in template_haskell.rst
* Remove 'recursive do' from the list of unsupported items in TH
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af1e84e794591e09e20c661fa1d3df59f5b56e4a">af1e84e7</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-26T05:36:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Big refactor of module structure
* Move everything from `GHC.HsToCore.PmCheck.*` to
`GHC.HsToCore.Pmc.*` in analogy to `GHC.Tc`, rename exported
`covCheck*` functions to `pmc*`
* Rename `Pmc.Oracle` to `Pmc.Solver`
* Split off the LYG desugaring and checking steps into their own
modules (`Pmc.Desugar` and `Pmc.Check` respectively)
* Split off a `Pmc.Utils` module with stuff shared by
`Pmc.{,Desugar,Check,Solver}`
* Move `Pmc.Types` to `Pmc.Solver.Types`, add a new `Pmc.Types` module
with all the LYG types, which form the interfaces between
`Pmc.{Desugar,Check,Solver,}`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f08f98e821bc4b755a7b6ad3bad39ce1099c5405">f08f98e8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-26T05:36:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Extract SharedIdEnv into its own module
It's now named `GHC.Types.Unique.SDFM.UniqSDFM`.
The implementation is more clear about its stated goals and supported
operations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1cde295c543e209c3b81256b50e77f3c5132a4ad">1cde295c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-26T05:37:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add bigNatFromWordArray
Reimplementation of integer-gmp's byteArrayToBigNat#
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bda55fa0444310079ab89f2d28ddb8982975b646">bda55fa0</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:18:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make 'undefined x' linear in 'x' (#18731)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b">160fba4a</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:19:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disallow linear types in FFI (#18472)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e124f2a7d9a5932a4c2383fd3f9dd772b2059885">e124f2a7</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:19:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix handling of function coercions (#18747)
This was broken when we added multiplicity to the function type.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ff433824ea4d265fca09de9c26f3fd77a34bb22">7ff43382</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-27T03:01:31+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments: change outdated reference to mergeOps
As of 686e06c59c3aa6b66895e8a501c7afb019b09e36,
GHC.Parser.PostProcess.mergeOps no longer exists.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4edf5527dbdd9781260e8822cb11a3f758fc7e91">4edf5527</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-27T10:04:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't rearrange (->) in the renamer
The parser produces an AST where the (->)
is already associated correctly:
1. (->) has the least possible precedence
2. (->) is right-associative
Thus we don't need to handle it in mkHsOpTyRn.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9ce159ba58ca7e8946b46e19b1361588b677a26">a9ce159b</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-27T10:04:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove outdated comment in rnHsTyKi
This comment dates back to 3df40b7b78044206bbcffe3e2c0a57d901baf5e8
and does not seem relevant anymore.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/583a2070f1ad9162a365b034b27c3b80daafb8df">583a2070</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-09-29T00:31:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize NthCo (FunCo ...) in coercion opt
We were missing this case previously.
Close #18528.
Metric Decrease:
T18223
T5321Fun
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b31a3360e2ef12f3ec7eaf66b3600247c1eb36c3">b31a3360</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-29T00:32:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix kind inference when checking datacons
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5830a12c46e7227c276a8a71213057595ee4fc04">5830a12c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-29T00:32:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">New linear types syntax: a %p -> b (#18459)
Implements GHC Proposal #356
Updates the haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bca4d36dd835c1c31c8f3364113586e1aedc6787">bca4d36d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-29T00:32:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error messages for (a %m) without LinearTypes
Detect when the user forgets to enable the LinearTypes
extension and produce a better error message.
Steals the (a %m) syntax from TypeOperators, the workaround
is to write (a % m) instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9635d0a9bbb7f659c376b68cdc87223c864243c">b9635d0a</a></strong>
<div>
<span>by Benjamin Maurer</span>
<i>at 2020-09-29T00:32:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Description of flag `-H` was in 'verbosity options', moved to 'misc'.
Fixes #18699
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74c797f6b72c4d01f5e0092dfac1461f3f3dd7a2">74c797f6</a></strong>
<div>
<span>by Benjamin Maurer</span>
<i>at 2020-09-29T00:33:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Workaround for #18623: GHC crashes bc. under rlimit for vmem it will reserve
_all_ of it, leaving nothing for, e.g., thread stacks.
Fix will only allocate 2/3rds and check whether remainder is at least large
enough for minimum amount of thread stacks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4365d77a0b306ada61654c3648b844cfa0f4fdcf">4365d77a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-29T00:33:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test #18501
ghc/ghc!3220 ended up fixing #18501. This patch adds a regression
test for #18501 to ensure that it stays fixed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e3f00dd24936b6674d0a2322f8410125968583e">8e3f00dd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-29T17:24:03+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make the parser module less dependent on DynFlags
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ab0d8f77ec67676de40ebe6ff7e86756e5c761e">3ab0d8f7</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-30T02:48:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Long-distance information for LocalBinds (#18626)
Now `desugarLocalBind` (formerly `desugarLet`) reasons about
* `FunBind`s that
* Have no pattern matches (so which aren't functions)
* Have a singleton match group with a single GRHS
* (which may have guards)
* and looks through trivial post-typechecking `AbsBinds` in doing so
to pick up the introduced renamings.
And desugars to `PmLet` LYG-style guards. Since GRHSs are no longer
denoted simply by `NonEmpty PmGRHS`, but also need to carry a `[PmGrd]`
for the `PmLet`s from `LocalBind`s, I added `PmGRHSs` to capture that.
Since we call out to the desugarer more often, I found that there were
superfluous warnings emitted when desugaring e.g. case expressions.
Thus, I made sure that we deactivate any warnings in the LYG desugaring
steps by the new wrapper function `noCheckDs`.
There's a regression test in `T18626`. Fixes #18626.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8f60efc831c6adb5bfee8449b76238ba6d582db">f8f60efc</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-30T02:49:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T12971 as broken on Windows
Due to #17945.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6527fc57b8e099703f5bdb5ec7f1dfd421651972">6527fc57</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-30T02:49:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal, hsc2hs, directory, process submodules
Necessary for recent Win32 bump.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df3f58807580bc2762086e063e3823b05de6fd64">df3f5880</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-30T02:49:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unsafeGlobalDynFlags (#17957, #14597)
There are still global variables but only 3 booleans instead of a single
DynFlags.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9befd94d79a78fd53a28a4ce051a91d2215d069c">9befd94d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-30T02:49:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused global variables
Some removed globals variables were still declared in the RTS.
They were removed in the following commits:
* 4fc6524a2a4a0003495a96c8b84783286f65c198
* 0dc7985663efa1739aafb480759e2e2e7fca2a36
* bbd3c399939311ec3e308721ab87ca6b9443f358
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c98699f685d8c53fd594b6de22b425ed951174f">7c98699f</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-09-30T02:50:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Omit redundant kind equality check in solver
See updated Note [Use loose types in inert set] in
GHC.Tc.Solver.Monad.
Close #18753.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/395498260ab444f5e1ec82d716bea3cc3ad887f7">39549826</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-30T02:50:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pmc: Don't call exprType on type arguments (#18767)
Fixes #18767.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/235e410f63a4725bbc4466dbdef7d5f661793e84">235e410f</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-09-30T02:51:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Regression test for #10709.
Close #10709
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c32655fffd0d8862f3ba693351f1e612daa0b6b">5c32655f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-30T22:31:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/doc: Clarify documentation of key-value configuration</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bb02873eeeca41a64d26becb9057e988f444acd">0bb02873</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:34:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for T18574
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e393f213f5ccff4fd6034d5294e51aa5a2720890">e393f213</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:34:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow fusion with catMaybes (#18574)
Metric Decrease:
T18574
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d2cfad96831edbe50aeddaefc1a3b0fb0dd73bc2">d2cfad96</a></strong>
<div>
<span>by Fendor</span>
<i>at 2020-10-01T18:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add mainModuleNameIs and demote mainModIs
Add `mainModuleNameIs` to DynFlags and demote
`mainModIs` to function which uses the homeUnit from DynFlags
it is created from.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fc351ab8fbf02eaf473e97b3ce8c4cddcba3a8a5">fc351ab8</a></strong>
<div>
<span>by Fendor</span>
<i>at 2020-10-01T18:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use HomeUnit for main module without module declaration
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dca1cb22cab4fa7f5937e9ffdc0ee32313dbd01c">dca1cb22</a></strong>
<div>
<span>by Fendor</span>
<i>at 2020-10-01T18:35:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove mAIN completely
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5aaceecaa04ce7ea5bade6eb96c0d129109c15a">a5aaceec</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:36:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use ADTs for parser errors/warnings
Haskell and Cmm parsers/lexers now report errors and warnings using ADTs
defined in GHC.Parser.Errors. They can be printed using functions in
GHC.Parser.Errors.Ppr.
Some of the errors provide hints with a separate ADT (e.g. to suggest to
turn on some extension). For now, however, hints are not consistent
across all messages. For example some errors contain the hints in the
main message. I didn't want to change any message with this patch. I
expect these changes to be discussed and implemented later.
Surprisingly, this patch enhances performance. On CI
(x86_64/deb9/hadrian, ghc/alloc):
parsing001 -11.5%
T13719 -2.7%
MultiLayerModules -3.5%
Naperian -3.1%
Bump haddock submodule
Metric Decrease:
MultiLayerModules
Naperian
T13719
parsing001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a946c7ef9eec768878d261c20437b924cd3afda3">a946c7ef</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:36:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Less DynFlags in Header parsing
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dafe79433c2ca884da3677194ee38913ee30e8dc">dafe7943</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:36:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser: remove some unused imports
These are not reported by GHC because Happy adds {-# OPTIONS_GHC -w #-}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93d5de165a81dfb335bf1646c2e29956f5ab55ea">93d5de16</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:36:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't import GHC.Unit to reduce the number of dependencies
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3655f810b4eba1fb7d81a3227a08dae8b85dfc4">e3655f81</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-01T18:36:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't attach CPR signatures to NOINLINE data structures (#18154)
Because the generated `KindRep`s don't have an unfolding, !3230 did not
actually stop to compute, attach and serialise unnecessary CPR
signatures for them. As already said in
`Note [CPR for data structures]`, that leads to bloated interface
files which is ultimately quadratic for Nested CPR.
So we don't attach any CPR signature to bindings that
* Are not thunks (because thunks are not in WHNF)
* Have arity 0 (which means the top-level constructor is not a lambda)
If the data structure has an unfolding, we continue to look through it.
If not (as is the case for `KindRep`s), we look at the unchanged CPR
signature and see `topCprType`, as expected.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ba5965eb10967d21b992aac925fb772db2ddde12">ba5965eb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-10-01T18:37:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #18755.
Close #18755
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8018c17747342444c67eeec21a506c89c1110e8">a8018c17</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-01T18:37:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix pretty-printing of the mult-polymorphic arrow
A follow-up to !4020 (5830a12c46e7227c276a8a71213057595ee4fc04)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5523324d2c55e0091857e21bf5613b5f6b442a7">e5523324</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-01T18:38:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add integerNegate RULE
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1edd6d21c0abea34b498a627234a97df21648024">1edd6d21</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-01T18:39:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor: remove rnHsDoc
It did not do any useful work.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9ae83af9e0cf48e860f2b7e1d50a057cb8a7890">a9ae83af</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-02T08:00:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typos in comments
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b81350bb925f8cb309355ee46238dbc11b796faf">b81350bb</a></strong>
<div>
<span>by Icelandjack</span>
<i>at 2020-10-02T08:01:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replaced MkT1 with T1 in type signatures.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c9beab75aaa5fbbb11132c99e2af114f322152f">3c9beab7</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-02T13:51:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor TTG clean-up: comments, unused families, bottom
1. Fix and update section headers in GHC/Hs/Extension.hs
2. Delete the unused 'XCoreAnn' and 'XTickPragma' families
3. Avoid calls to 'panic' in 'pprStmt'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12c06927a03a2fdb516f7008c57d68568b02b576">12c06927</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-02T13:52:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: implement integerRecipMod (#18427)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd4f40512bb18e296280acde0507b4233a27b69">8dd4f405</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-02T13:52:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: implement integerPowMod (#18427)
Incidentally fix powModInteger which was crashing in integer-gmp for
negative exponents when the modular multiplicative inverse for the base
didn't exist. Now we compute it explicitly with integerRecipMod so that
every backend returns the same result without crashing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68">1033a720</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-02T13:53:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject linearity in kinds in checkValidType (#18780)
Patch taken from https://gitlab.haskell.org/ghc/ghc/-/issues/18624#note_300673
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0ccba66c4d7c16eba7e2fdc1857fc0f63cd33f9">b0ccba66</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-03T19:33:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small documentation fixes
- Fix formatting of code blocks and a few sphinx warnings
- Move the Void# change to 9.2, it was done right after the branch was cut
- Fix typo in linear types documentation
- Note that -Wincomplete-uni-patterns affects lazy patterns
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70dc2f09a33a4c3f485d8b63e92a21955643a0b7">70dc2f09</a></strong>
<div>
<span>by Karel Gardas</span>
<i>at 2020-10-03T19:33:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix rts.cabal to use real arch names and not aliasses (fixes #18654)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc5de347bccd7a2691a9e4b927ab80acb7e15991">bc5de347</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-05T13:59:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Inline `integerDecodeDouble#` and constant-fold `decodeDouble_Int64#` instead
Currently, `integerDecodeDouble#` is known-key so that it can be
recognised in constant folding. But that is very brittle and doesn't
survive worker/wrapper, which we even do for
`NOINLINE` things since #13143.
Also it is a trade-off: The implementation of `integerDecodeDouble#`
allocates an `Integer` box that never cancels aways if we don't inline
it.
Hence we recognise the `decodeDouble_Int64#` primop instead in constant
folding, so that we can inline `integerDecodeDouble#`. As a result,
`integerDecodeDouble#` no longer needs to be known-key.
While doing so, I realised that we don't constant-fold
`decodeFloat_Int#` either, so I also added a RULE for it.
`integerDecodeDouble` is dead, so I deleted it.
Part of #18092. This improves the 32-bit `realToFrac`/`toRational`:
Metric Decrease:
T10359
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/802b5e6fdd6dfc58396a9dca1903dc5a1d6634ca">802b5e6f</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-05T13:59:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix linear types in TH splices (#18465)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18a3ddf75d25094096a7fe44fd250de973041187">18a3ddf7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-05T13:59:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix integer width in TICK_BUMP_BY
Previously `TICK_BUMP_BY` was defined as
```c
#define TICK_BUMP_BY(ctr,n) CLong[ctr] = CLong[ctr] + n
```
Yet the tickers themselves were defined as `StgInt`s. This happened to
work out correctly on Linux, where `CLong` is 64-bits. However, it
failed on Windows, where `CLong` is 32-bits, resulting in #18782.
Fixes #18783.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5fc4243bf2da2adbae3d01d163053e8895bc52d9">5fc4243b</a></strong>
<div>
<span>by Rachel</span>
<i>at 2020-10-07T14:59:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document profiling flags, warning flags, and no-pie
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b41f7c3814b2e0e765311babc851cd3d9b6a78d8">b41f7c38</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-10-07T15:00:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">WinIO: Small changes related to atomic request swaps.
Move the atomix exchange over the Ptr type to an internal module.
Fix a bug caused by us passing ptr-to-ptr instead of ptr to
atomic exchange.
Renamed interlockedExchange to exchangePtr.
I've also added an cas primitive. It turned out we don't need it
for WinIO but I'm leaving it in as it's useful for other things.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/948a14e1eaaf0c033e3f19d1b9eecb398ddc8661">948a14e1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-07T15:00:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix name of Ubuntu 20.04 image</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74d4017b744585a89709ac4b74dbe37b44741464">74d4017b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-07T15:01:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -flink-rts (#18651)
Before this patch -flink-rts could link with GHC's rts instead of the
selected one.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e8b923d3c8a5ff415091b92c4c7b7e1e33d0ae6">0e8b923d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-07T15:01:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to compiler/GHC/SysTools.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6dff830754a97220eacf032c32cd54b18654917">d6dff830</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-07T15:02:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve as-parsed arrow type for HsUnrestrictedArrow
When linear types are disabled, HsUnrestrictedArrow is treated as
HslinearArrow.
Move this adjustment into the type checking phase, so that the parsed
source accurately represents the source as parsed.
Closes #18791
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/030c5ce0a58e212eb7b973e1206b775085b74afb">030c5ce0</a></strong>
<div>
<span>by Karel Gardas</span>
<i>at 2020-10-07T15:02:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: use stage0 linker to merge objects when done during the stage0
Fixes #18800.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a94db588db5e2983112301e94b2133b5a3f03875">a94db588</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-07T15:03:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Allow whitespace before "Metric (in|de)crease"
Several people have struggled with metric change annotations
in their commit messages not being recognized due to the fact that
GitLab's job log inserts a space at the beginning of each line. Teach
the regular expression to accept this whitespace.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e91ddddd714b22df2569681fb033fbb151ec7e6b">e91ddddd</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-07T15:04:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Misc cleanup
* Include funTyCon in exposedPrimTyCons.
Every single place using exposedPrimTyCons was adding funTyCon
manually.
* Remove unused synTyConResKind and ieLWrappedName
* Add recordSelectorTyCon_maybe
* In exprType, panic instead of giving a trace message and dummy output.
This prevents #18767 reoccurring.
* Fix compilation error in fragile concprog001 test (part of #18732)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/386c2d7ff80843051ad15eab5de3766430ee98a5">386c2d7f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-09T08:40:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use UnitId in the backend instead of Unit
In Cmm we can only have real units identified with an UnitId. Other
units (on-the-fly instantiated units and holes) are only used in
type-checking backpack sessions that don't produce Cmm.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a566c83d4fc3a90b209b33131a2972ea53ec81b2">a566c83d</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2020-10-09T08:41:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update containers to v0.6.4.1
Updates containers submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060">fd984d68</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-09T08:41:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: fix race condition in StgCRun
On windows the stack has to be allocated 4k at a time, otherwise we get
a segfault. This is done by using a helper ___chkstk_ms that is provided
by libgcc. The Haskell side already knows how to handle this but we need
to do the same from STG. Previously we would drop the stack in StgRun
but would only make it valid whenever the scheduler loop ran.
This approach was fundamentally broken in that it falls apart when you
take a signal from the OS. We see it less often because you initially
get allocated a 1MB stack block which you have to blow past first.
Concretely this means we must always keep the stack valid.
Fixes #18601.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/accdb24a086b80fe74776246aa33bce5a920e3c8">accdb24a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-09T08:42:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose RTS-only ways (#18651)
Some RTS ways are exposed via settings (ghcThreaded, ghcDebugged) but
not all. It's simpler if the RTS exposes them all itself.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d360f3438da7f6eb51e217c6697db6fb338c6fd7">d360f343</a></strong>
<div>
<span>by MaxGabriel</span>
<i>at 2020-10-09T08:43:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document -Wderiving-typeable
Tracking: #18641
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e48cab2a57f2342891f985bcb44817e17e985275">e48cab2a</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-09T08:43:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a flag to indicate that gcc supports -no-pie
Fixes #17919.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7e2fff96975128397e2dab7d57da3c9c6b8c76b">f7e2fff9</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-10-09T08:44:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add linting of `base` to the CI
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/45a1d493ec877f5fa0b3228deee3e019033c89db">45a1d493</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-10-09T08:45:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use proper RTS flags when collecting residency in perf tests.
Replace options like collect_stats(['peak_megabytes_allocated'],4) with
collect_runtime_residency(4) and so forth. Reason being that the later
also supplies some default RTS arguments which make sure residency does
not fluctuate too much.
The new flags mean we get new (hopefully more accurate) baselines so
accept the stat changes.
-------------------------
Metric Decrease:
T4029
T4334
T7850
Metric Increase:
T13218
T7436
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef65b1546ad01fdd10386f713fc246d49269a196">ef65b154</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-10-09T08:45:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/timeout: Fix windows specific errors.
We now seem to use -Werror there. Which caused some long standing
warnings to become errors.
I applied changes to remove the warnings allowing the testsuite to
run on windows as well.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e691a5a04692beb601d480ccf9f283199a70ed62">e691a5a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-09T08:46:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: add quick-debug flavour
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12191a99d3b978b697ec0fb4412276fbea5dce8f">12191a99</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-09T08:47:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: match on small Integer/Natural
Previously we only matched on *variables* whose unfoldings were a ConApp
of the form `IS lit#` or `NS lit##`. But we forgot to match on the
ConApp directly... As a consequence, constant folding only worked after
the FloatOut pass which creates bindings for most sub-expressions. With
this patch, matching on bignums works even with -O0 (see bignumMatch
test).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/36787bba78ae5acbb857c84b85b8feb7c83e54a5">36787bba</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-09T08:47:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations : preserve parens in GADTs
A cleanup in 7f418acf61e accidentally discarded some parens in
ConDeclGADT.
Make sure these stay in the AST in a usable format.
Also ensure the AnnLolly does not get lost in a GADT.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32dc7698a0c38afe2889119a2df0f2a2b8debe0a">32dc7698</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-09T08:48:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix roles in GADTs (#18799)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9657f6f34a1a00008a0db935dbf25733cb483cd4">9657f6f3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-09T08:48:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">sdist: Include hadrian sources in source distribution
Previously the make build system's source distribution rules neglected
to include Hadrian's sources.
Fixes #18794.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c832f7e2a9314cfd61257cb161b1795b612d12b5">c832f7e2</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-09T08:49:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fixed timeouts non-threaded.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f0243ae5b359124936a8ff3dd0a287df3d7aca2">6f0243ae</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-09T08:50:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fix array splat
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fd3d360cab977e00fb6d90d0519962227b029bb">0fd3d360</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-09T08:50:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fixed bytestring reading interface.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dfaef1cae7a4a0cb8783933274dae7f39d7165a0">dfaef1ca</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-09T08:51:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">winio: fixed more data error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfdccac6acce84e15292a454d12f4e0d87ef6f10">bfdccac6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-09T08:52:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix desugaring of record updates on data families
This fixes a long-standing bug in the desugaring of record
updates for data families, when the latter involves a GADT. It's
all explained in Note [Update for GADTs] in GHC.HsToCore.Expr.
Building the correct cast is surprisingly tricky, as that Note
explains.
Fixes #18809. The test case (in indexed-types/should_compile/T18809)
contains several examples that exercise the dark corners.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5c7c9c8578de1248826c21ebd08e475d094a552">e5c7c9c8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-09T08:52:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump win32-tarballs version to 0.3
This should fix #18774.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef950b19c04bc9c41920ecc9f94382653981d4bb">ef950b19</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-10-09T08:53:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add TyCon Set/Env and use them in a few places.
Firstly this improves code clarity.
But it also has performance benefits as we no longer
go through the name of the TyCon to get at it's unique.
In order to make this work the recursion check for TyCon
has been moved into it's own module in order to avoid import
cycles.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd302e938ebf48c73d9f715d67ce8cd990f972ff">fd302e93</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-09T08:54:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -pgmlm and -optlm flags
!3798 added documentation and semantics for the flags,
but not parsing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/db236ffc03e5e17f71295469040da96b03ec2f87">db236ffc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-09T08:54:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: increase timeout for T18223 (#18795)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a243e9daaa6c17c0859f47ae3a098e680aa28cf">6a243e9d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-09T08:55:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cache HomeUnit in HscEnv (#17957)
Instead of recreating the HomeUnit from the DynFlags every time we need
it, we store it in the HscEnv.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5884fd325248e75d40c9da431b4069e43a2c182c">5884fd32</a></strong>
<div>
<span>by Fendor</span>
<i>at 2020-10-09T19:46:28+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move File Target parser to library #18596
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea59fd4d0abe73e1127dcdd91855a39232e62d41">ea59fd4d</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-10-10T14:49:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Lint the compiler for extraneous LANGUAGE pragmas
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22f218b729a751bc5e5965624a716fc542f502a5">22f218b7</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-10T14:50:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix quantification in GADTs (#18790)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74ee1237bf243dd7d8b758a53695575c364c3088">74ee1237</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-10T14:51:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix bigNatCompareWord# bug (#18813)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/274e21f02fabb4b3761841972b1074d0c0146fae">274e21f0</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-10-11T10:55:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove the dependency on the ghc-linters stage
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/990ea991a1c35fdb894fcb91f919fb8f8fed33dd">990ea991</a></strong>
<div>
<span>by Daniel Rogozin</span>
<i>at 2020-10-11T22:20:04+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fall back to types when looking up data constructors (#18740)
Before this patch, referring to a data constructor in a term-level
context led to a scoping error:
ghci> id Int
<interactive>:1:4: error: Data constructor not in scope: Int
After this patch, the renamer falls back to the type namespace
and successfully finds the Int. It is then rejected in the type
checker with a more useful error message:
<interactive>:1:4: error:
• Illegal term-level use of the type constructor ‘Int’
imported from ‘Prelude’ (and originally defined in ‘GHC.Types’)
• In the first argument of ‘id’, namely ‘Int’
In the expression: id Int
We also do this for type variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9bbc84d20d0f50901351246cbe97c45234ca7d95">9bbc84d2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-12T18:21:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: refactor DmdAnal
Make demand analysis usable without having to provide DynFlags.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7fdcce6d4d13a10a1b2336c1d40482c64dba664d">7fdcce6d</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-10-13T00:12:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Initial ShortText code and conversion of package db code
Metric Decrease:
Naperian
T10421
T10421a
T10547
T12150
T12234
T12425
T13035
T18140
T18304
T5837
T6048
T13253-spj
T18282
T18223
T3064
T9961
Metric Increase
T13701
HFSKJH
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a5f29185921cf2af908988ab3608602bcb40290">0a5f2918</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-13T00:13:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser: don't require the HomeUnitId
The HomeUnitId is only used by the Cmm parser and this one has access to
the DynFlags, so it can grab the UnitId of the HomeUnit from them.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f4f5794eb3504bf2ca093dc5895742395fdbde9">8f4f5794</a></strong>
<div>
<span>by HaskellMouse</span>
<i>at 2020-10-13T13:05:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unification of Nat and Naturals
This commit removes the separate kind 'Nat' and enables promotion
of type 'Natural' for using as type literal.
It partially solves #10776
Now the following code will be successfully typechecked:
data C = MkC Natural
type CC = MkC 1
Before this change we had to create the separate type for promotion
data C = MkC Natural
data CP = MkCP Nat
type CC = MkCP 1
But CP is uninhabited in terms.
For backward compatibility type synonym `Nat` has been made:
type Nat = Natural
The user's documentation and tests have been updated.
The haddock submodule also have been updated.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fc1cb54d1afc0f002deb4d080c9b824f423b647">0fc1cb54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-14T03:42:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Verify that Hadrian builds with Stack
As noted in #18726, this regularly breaks. Let's test it.
Note that we don't actually perform a build of GHC itself; we merely
test that the Hadrian executable builds and works (by invoking `hadrian
--version`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89f4d8e950a1ed2a3ffab424233d3bcd243b1771">89f4d8e9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-14T12:03:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump LLVM version to 10.0
Fixes #18267.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad">716385c9</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-10-14T12:04:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DataKinds the sole arbiter of kind-level literals (and friends)
Previously, the use of kind-level literals, promoted tuples,
and promoted lists required enabling both `DataKinds` and
`PolyKinds`. This made sense back in a `TypeInType` world, but not so
much now that `TypeInType`'s role has been superseded. Nowadays,
`PolyKinds` only controls kind polymorphism, so let's make `DataKinds`
the thing that controls the other aspects of `TypeInType`, which include
literals, promoted tuples and promoted lists.
There are some other things that overzealously required `PolyKinds`,
which this patch fixes as well:
* Previously, using constraints in kinds (e.g., `data T :: () -> Type`)
required `PolyKinds`, despite the fact that this is orthogonal to kind
polymorphism. This now requires `DataKinds` instead.
* Previously, using kind annotations in kinds
(e.g., `data T :: (Type :: Type) -> Type`) required both `KindSignatures`
and `PolyKinds`. This doesn't make much sense, so it only requires
`KindSignatures` now.
Fixes #18831.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac300a0d49343e6a558dc36d94fc558f51d43bb2">ac300a0d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-14T12:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove "Operator sections" from docs/users_guide/bugs.rst
The issue described in that section was fixed by
2b89ca5b850b4097447cc4908cbb0631011ce979
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf2411a3c198cb2df93a9e0aa0c3b8297f47058d">bf2411a3</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-14T12:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix PostfixOperators (#18151)
This fixes a regression introduced in 2b89ca5b850b4097447cc4908cbb0631011ce979
See the new T18151x test case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e60ae8a38394370fd8818ad004a101466fc7d2dc">e60ae8a3</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2020-10-14T18:06:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -Wnoncanonical-{monad,monoid}-instances to standardWarnings
-------------------------
Metric Decrease:
T12425
Metric Increase:
T17516
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15d2340cb9dc833adb87784e6de86dba235290f7">15d2340c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-14T18:06:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix some missed opportunities for preInlineUnconditionally
There are two signficant changes here:
* Ticket #18815 showed that we were missing some opportunities for
preInlineUnconditionally. The one-line fix is in the code for
GHC.Core.Opt.Simplify.Utils.preInlineUnconditionally, which now
switches off only for INLINE pragmas. I expanded
Note [Stable unfoldings and preInlineUnconditionally] to explain.
* When doing this I discovered a way in which preInlineUnconditionally
was occasionally /too/ eager. It's all explained in
Note [Occurrences in stable unfoldings] in GHC.Core.Opt.OccurAnal,
and the one-line change adding markAllMany to occAnalUnfolding.
I also got confused about what NoUserInline meant, so I've renamed
it to NoUserInlinePrag, and changed its pretty-printing slightly.
That led to soem error messate wibbling, and touches quite a few
files, but there is no change in functionality.
I did a nofib run. As expected, no significant changes.
Program Size Allocs
----------------------------------------
sphere -0.0% -0.4%
----------------------------------------
Min -0.0% -0.4%
Max -0.0% +0.0%
Geometric Mean -0.0% -0.0%
I'm allowing a max-residency increase for T10370, which seems
very irreproducible. (See comments on !4241.) There is always
sampling error for max-residency measurements; and in any case
the change shows up on some platforms but not others.
Metric Increase:
T10370
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c4bfed849d454bee707fcb2989eb7c6339eaedb">0c4bfed8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-14T18:07:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add missing :ghc-flag: directive</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51c4b851965abdece2f88f8e583256e15f3140fe">51c4b851</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-15T04:30:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Proxy# argument in Data.Typeable.Internal
No longer neccessary - TypeRep is now indexed, there is no ambiguity.
Also fix a comment in Evidence.hs, IsLabel no longer takes a Proxy#.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/809f09e8a7060691b1f2f5d6b95ca75e66437e55">809f09e8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-15T04:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix parsing of PIE flags
-fPIE and -fno-PIE flags were (un)setting Opt_PIC instead of Opt_PIE.
Original commit: 3625728a0e3a9b56c2b85ae7ea8bcabdd83ece6a
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d7db1488c4bd7764e8b1fe3cfde4c5a548cde16">3d7db148</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-15T04:31:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add missing #include on <stdlib.h>
This otherwise fails on newer Clangs, which warn
more aggressively on undeclared symbols.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/998803dc4dbceb36074644483e11e6183fa5355a">998803dc</a></strong>
<div>
<span>by Andrzej Rybczak</span>
<i>at 2020-10-15T11:40:32+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add flags for annotating Generic{,1} methods INLINE[1] (#11068)
Makes it possible for GHC to optimize away intermediate Generic representation
for more types.
Metric Increase:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6b14c4185ca944295d5cfa60ebc6f7ab2a257fc9">6b14c418</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-10-15T21:57:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Extend mAX_TUPLE_SIZE to 64
As well a ctuples and sums.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d495f36a8fb96f26fae4043364b8a7f38b884e00">d495f36a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-15T21:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Clean-up whitespace in Interpreter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf10becdff4f8dba9bfa35326a1a338dccdd2b20">cf10becd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-15T21:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler/ByteCode: Use strict Maps in bytecode assembler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ae146b536445d20ef9983ff0e38ce1beaec6f321">ae146b53</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-15T21:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler/ByteCode: Make LocalLabel a newtype
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc536288c32df9c4b9f37020b76348f58a57b3cb">cc536288</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-15T21:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler/ByteCode: Allow 2^32 local labels
This widens LocalLabel to 2^16, avoiding the crash observed in #14334.
Closes #14334.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bb0512f319c1361e2c5a7ab3e1c2978d3a95b9b">1bb0512f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">mingw: Extract zst toolchain archives
This should have been done when the toolchain was bumped.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf7c5b6ddea5024baa2e04110ab2801f8797fafd">bf7c5b6d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Reintroduce necessary LANGUAGE pragmas
These were incorrectly removed in a recent cleanup commit.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6b4be4bfc9754050a8014851f5adde9721589bc">c6b4be4b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Sort metrics by metric type
Closes #18838.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7989c936390441886e9cd1cda1c093dd4b32413">c7989c93</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Account for -Wnoncanonical-monoid-instances changes on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/330a5433b709c0cc16eb5fe9a06c21f4b2009be7">330a5433</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add __mingw_vfprintf to RtsSymbols.c
Following the model of the other printf symbols. See Note [Symbols for
MinGW's printf].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4a69f37acf5c04e3c4d912d01b25a06a71b224c">c4a69f37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Remove allow_failure from Windows jobs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a9679dbfc77c600e6c2a031ccab37d203a19cf9">9a9679db</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-16T00:15:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix Hadrian bindist names
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/07b0db86595890dfca6f624e554cdb8c9b86d0cc">07b0db86</a></strong>
<div>
<span>by f-a</span>
<i>at 2020-10-16T10:14:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify Eq documentation #18713</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aca0e63bce4b29ac6e0cd06dbd169b0c06b53e25">aca0e63b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-17T10:20:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow doc-tarball job to fail
Currently the Hadrian build appears not to package documentation correctly,
causing doc-tarball to fail due to the Windows build.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b02a9ea79dddd98f6bbb42e1652d7ea38db7d55e">b02a9ea7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-17T13:26:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: s/allow_newer/allow_failure
Silly mistake on my part.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59d7c9f45b034809516703b57c84e3dac1834578">59d7c9f4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-10-17T22:01:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Skip type family defaults with hs-boot and hsig files
Works around #17190, possible resolution for #17224. New design is is
according to accepted [GHC Propoal 320].
Instances in signatures currently unconditionally opt into associated
family defaults if no explicit instance is given. This is bad for two
reasons:
1. It constrains possible instantiations to use the default, rather
than possibly define the associated family differently.
2. It breaks compilation as type families are unsupported in
signatures.
This PR simply turns off the filling in of defaults in those cases.
Additionally, it squelches a missing definition warning for hs-boot too
that was only squelched for hsig before.
The downsides are:
1. There is no way to opt into the default, other than copying its
definition.
2. If we fixed type classes in signatures, and wanted instances to
have to explicitly *out of* rather than into the default, that would
now be a breaking change.
The change that is most unambiguously goood is harmonizing the warning
squelching between hs-boot or hsig. Maybe they should have the warning
(opt out of default) maybe they shouldn't (opt in to default), but
surely it should be the same for both.
Add hs-boot version of a backpack test regarding class-specified
defaults in instances that appear in an hs-boot file.
The metrics increase is very slight and makes no sense --- at least no
one has figured anything out after this languishing for a while, so I'm
just going to accept it.
Metric Increase:
T10421a
[GHC proposal 320]: https://github.com/ghc-proposals/ghc-proposals/pull/320
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7eb46a09e2188e64d226b75361b36ab732b5b372">7eb46a09</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-17T22:02:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Refactor fixed-point iteration in GHC.Core.Opt.Arity
Arity analysis used to propagate optimistic arity types during
fixed-point interation through the `ArityEnv`'s `ae_cheap_fun` field,
which is like `GHC.Core.Utils.exprIsCheap`, but also considers the
current iteration's optimistic arity, for the binder in question only.
In #18793, we have seen that this is a problematic design, because it
doesn't allow us to look through PAP bindings of that binder.
Hence this patch refactors to a more traditional form with an explicit
signature environment, in which we record the optimistic `ArityType` of
the binder in question (and at the moment is the *only* binder that is
recorded in the arity environment).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6b3eb06af41b7385737fb3a602acdb95a76d2eba">6b3eb06a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-17T22:02:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Record arity types for non-recursive lets
In #18793, we saw a compelling example which requires us to look at
non-recursive let-bindings during arity analysis and unleash their arity
types at use sites.
After the refactoring in the previous patch, the needed change is quite
simple and very local to `arityType`'s defn for non-recurisve `Let`.
Apart from that, we had to get rid of the second item of
`Note [Dealing with bottoms]`, which was entirely a safety measure and
hindered optimistic fixed-point iteration.
Fixes #18793.
The following metric increases are all caused by this commit and a
result of the fact that we just do more work now:
Metric Increase:
T3294
T12545
T12707
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/451455fd008500259f5d2207bdfdccf6dddb52c5">451455fd</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-17T22:02:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: Add dead arity analysis tests
We didn't seem to test these old tests at all, judging from their
expected output.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/50e9df49b7cd637c4552ab34bf629a01af4767c0">50e9df49</a></strong>
<div>
<span>by Dylan Yudaken</span>
<i>at 2020-10-17T22:02:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">When using rts_setInCallCapability, lock incall threads
This diff makes sure that incall threads, when using `rts_setInCallCapability`, will be created as locked.
If the thread is not locked, the thread might end up being scheduled to a different capability.
While this is mentioned in the docs for `rts_setInCallCapability,`, it makes the method significantly less useful as there is no guarantees on the capability being used.
This commit also adds a test to make sure things stay on the correct capability.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b995759ae2ba2161097a1c43efc650ccbce0276">0b995759</a></strong>
<div>
<span>by DylanZA</span>
<i>at 2020-10-17T22:02:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to testsuite/tests/ffi/should_run/all.T</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a91dcb669b3b221c51e8ba8bb85b7ae9806bc4ca">a91dcb66</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-17T22:04:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't get host RTS ways via settings (#18651)
To correctly perform a linking hack for Windows we need to link with the
RTS GHC is currently using. We used to query the RTS ways via the
"settings" file but it is fragile (#18651). The hack hasn't been fixed
to take into account all the ways (Tracing) and it makes linking of GHC
with another RTS more difficult (we need to link with another RTS and to
regenerate the settings file).
So this patch uses the ways reported by the RTS itself
(GHC.Platform.Ways.hostWays) instead of the "settings" file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d858a3aebee5adc447556b668b65b6e46370d8c0">d858a3ae</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-10-17T22:04:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linting corrections
* Bring back LANGUAGE pragmas in GHC.IO.Handle.Lock.Windows
* Exclude some modules that are wrongfully reported
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5b3e34ec39fc89a0bcd0b60cf9a4962c89ba72f">b5b3e34e</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-19T18:16:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement -Woperator-whitespace (#18834)
This patch implements two related warnings:
-Woperator-whitespace-ext-conflict
warns on uses of infix operators that would be parsed
differently were a particular GHC extension enabled
-Woperator-whitespace
warns on prefix, suffix, and tight infix uses of infix
operators
Updates submodules: haddock, containers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9648d680b4b07d48cf8741e0847abf07b95c7c1d">9648d680</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-19T18:16:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove pdocPrec
pdocPrec was only used in GHC.Cmm.DebugBlock.pprUnwindExpr, so remove
it. OutputableP becomes a one-function class which might be better for
performance.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee5dcdf95a7c408e9c339aacebf89a007a735f8f">ee5dcdf9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T00:47:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18346
This was fixed by 4291bddaea3148908c55f235ee8978e1d9aa6f20.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c7a5c0ca07085f31a3e2f8286bb57a0f35961cb">6c7a5c0c</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-20T00:48:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor comments, update linear types docs
- Update comments: placeHolderTypeTc no longer exists
"another level check problem" was a temporary comment from linear types
- Use Mult type synonym (reported in #18676)
- Mention multiplicity-polymorphic fields in linear types docs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a1ca3886b00630937d7f5073b2d7961f8e80ca">58a1ca38</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-10-20T00:49:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Compile modules with `-fobject-code` enabled to byte-code when loaded with `*` prefix in ghci (#8042)
The documentation states that when using :add and :load, the `*` prefix forces a module
to be loaded as byte-code. However, this seems to be ignored when -fobject-code has been
enabled. In that case, the compiled code is always used, regardless of whether the *-form
is used.
The idea is to consult the Targets in HscEnv and check the 'targetAllowObjCode' flag. If
the flag for given module is set, then patch up DynFlags and select compilation backend
accordingly.
This would require a linear scan of course, but that shouldn't be too costly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59b08a5d192e102f66a6d9260cc8466d7428cffe">59b08a5d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T00:49:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rename FLAVOUR -> BUILD_FLAVOUR
Previously the Hadrian jobs used the `FLAVOUR` environment variable to
communicate which flavour `ci.sh` should build whereas `make` used
`BUILD_FLAVOUR`. This caused unnecessary confusion. Consolidate these
two.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea736839d85594c95490dcf02d3325c2bbc68f33">ea736839</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-20T08:35:34+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">API Annotations: Keep track of unicode for linear arrow notation
The linear arrow can be parsed as `%1 ->` or a direct single token unicode
equivalent.
Make sure that this distinction is captured in the parsed AST by using
IsUnicodeSyntax where it appears, and introduce a new API Annotation,
AnnMult to represent its location when unicode is not used.
Updated haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf3c3bcd93b3a515f3c2db81b5a7c42af480c9b6">cf3c3bcd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-20T22:56:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T12971 as fragile on Windows
Due to #17945.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9d4dd9cbc4f1dd40e6beaf5d8301ac9d3034fca">b9d4dd9c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:44:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SMP.h: Add C11-style atomic operations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ccf2d4b091284a60acc6c16d166ea7cafade209f">ccf2d4b0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Infrastructure for testing with ThreadSanitizer
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a61f66d6c14762869ad95b7646bce975df9f80f8">a61f66d6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/CNF: Initialize all bdescrs in group
It seems wise and cheap to ensure that the whole bdescr of all blocks of
a compact group is valid, even if most cases only look at the flags
field.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65136c134d1b6e2f2c5d7193fade3c99a8cb81c4">65136c13</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Capability: Intialize interrupt field
Previously this was left uninitialized.
Also clarify some comments.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3ce6acaae1b386aeca6649738cf286ad71ed5cd">b3ce6aca</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Task: Make comments proper Notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d3890ac737e282a582f0cc9819dedd2a8c363501">d3890ac7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/SpinLock: Move to proper atomics
This is fairly straightforward; we just needed to use relaxed operations
for the PROF_SPIN counters and a release store instead of a write
barrier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef88712f5dcc9e245b4e3819be1889e659731b59">ef88712f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/OSThreads: Fix data race
Previously we would race on the cached processor count. Avoiding this is
straightforward; just use relaxed operations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33a719c392be4d8a389a1331c6c88093148f7396">33a719c3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/ClosureMaros: Use relaxed atomics
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f08951fd0279248bd4e9536e4cf44ba658aaf710">f08951fd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Bump minimum-supported gcc version to 4.7
Since the __atomic_* builtins are not supported until gcc 4.7. Given
that this version was released in 2012 I think this is acceptable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d584923a1e1fe92a4bb38b2cd1f0bf5a3b7802f0">d584923a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix thread leak in hs_try_putmvar00[13]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf1b0bc78da7dbe5f6fbda54b37a9cb165ff857f">bf1b0bc7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T20:59:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Introduce SET_HDR_RELEASE
Also ensure that we also store the info table pointer last to ensure
that the synchronization covers all stores.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f4cbc2942ad8b757a225b23c9f097f371ca490c">1f4cbc29</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T21:00:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/BlockAlloc: Use relaxed operations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0d07cffeded2b1d1b4ffed1f8b06eddc9f06600">d0d07cff</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T21:00:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Rework handling of mutlist scavenging statistics
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e5c7f6de8e3d4cda0c07e0f210d9d5004fc6131">9e5c7f6d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T21:00:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Avoid data races in StablePtr implementation
This fixes two potentially problematic data races in the StablePtr
implementation:
* We would fail to RELEASE the stable pointer table when enlarging it,
causing other cores to potentially see uninitialized memory.
* We would fail to ACQUIRE when dereferencing a stable pointer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/316add6762aca4a01fbe71d264b0c65c11313929">316add67</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T21:00:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Storage: Use atomics
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5c23bc4cd6936840deeb398bbea06165952f17c2">5c23bc4c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T21:00:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Updates: Use proper atomic operations
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d0f033c5109ae0131b81e6b9aaf2a04ebeba1f4">3d0f033c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-24T21:00:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Weak: Eliminate data races
By taking all_tasks_mutex in stat_exit. Also better-document the fact
that the task statistics are protected by all_tasks_mutex.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/24cfad4d297b129394342566cb1dab5c7cdba2eb">24cfad4d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-29T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/GC: Use atomics
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1514f535d3e30cd9acc1440ae1e5bdc16cb42384">1514f535</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-29T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use RELEASE ordering in unlockClosure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57a1e9763c1aa7ba760864ea2cf19f0d12fa6bff">57a1e976</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-29T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Storage: Accept races on heap size counters
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a1230340357b10ff9093a9c00144ba713a4f634">2a123034</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-29T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Join to concurrent mark thread during shutdown
Previously we would take all capabilities but fail to join on the thread
itself, potentially resulting in a leaked thread.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4aa10bd6d41fe93455683e97c6dd94a5577ff686">4aa10bd6</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-10-29T22:50:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix race in GC CPU time accounting
Ensure that the GC leader synchronizes with workers before calling
stat_endGC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb03b660cf52878101e7a4103b2d9935ee708864">bb03b660</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-29T22:53:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/SpinLock: Separate out slow path
Not only is this in general a good idea, but it turns out that GCC
unrolls the retry loop, resulting is massive code bloat in critical
parts of the RTS (e.g. `evacuate`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d208adc51bd64cde234c9f50c5d3d097c69b3032">d208adc5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-29T22:55:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use relaxed ordering on spinlock counters
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
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.gitlab-ci.yml
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.gitlab/ci.sh
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Cmm/Lexer.x
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