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<h3>
Andreas Klebinger pushed to branch wip/andreask/strict_dicts
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/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/582ee524add052b3b98f4f9288c5cb1bb9b5c1d2">582ee524</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-10-19T11:25:29+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable strict dicts by default at -O2.
In the common case this is a straight performance win
at a compile time cost so we enable it at -O2.
In rare cases it can lead to compile time regressions
because of changed inlining behaviour. Which can very
rarely also affect runtime performance.
Increasing the inlining threshold can help to avoid this
which is documented in the user guide.
In terms of measured results this reduced instructions executed
for nofib by 1%.
However for some cases (e.g. Cabal) enabling this
by default increases compile time by 2-3% so we enable it only
at -O2 where it's clear that a user is willing to trade compile
time for runtime.
Most of the testsuite runs without -O2 so there are few
perf changes.
T12545: We perform more WW work because dicts are now treated strict.
T14697: Compiling empty modules. Probably because of changes inside ghc.
T9203: I can't reproduce this improvement locally. Might be spurious.
-------------------------
Metric Decrease:
T14697
T9203
Metric Increase:
T12545
-------------------------
</pre>
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