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<h3>
John Ericson pushed to branch wip/keep-going-hs-boot
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/859db7d639da08622a76a94b85bc9b2b27b8aabc">859db7d6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-01T14:18:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve/fix -fcatch-bottoms documentation
Old documentation suggests that -fcatch-bottoms only adds a default
alternative to bottoming case expression, but that's not true. We use a
very simplistic "is exhaustive" check and add default alternatives to
any case expression that does not cover all constructors of the type. In
case of GADTs this simple check assumes all constructors should be
covered, even the ones ruled out by the type of the scrutinee.
Update the documentation to reflect this.
(Originally noticed in #17648)
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54dfa94a36a564e5d092aa566d4670c7e008f152">54dfa94a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-03T21:14:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix docs for FrontendResult
Other variant was removed in ac1a379363618a6f2f17fff65ce9129164b6ef30
but docs were no changed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5e63d9c07c0585b85c8fa340d30aeff0130af3f4">5e63d9c0</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-03T21:15:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor HscMain.finish
I found the old control flow a bit hard to follow; I rewrote it to first
decide whether to desugar, and then use that choice when computing
whether to simplify / what sort of interface file to write.
I hope eventually we will always write post-tc interface files, which
will make the logic of this function even simpler, and continue the
thrust of this refactor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e580e5b8d08b02c39ca49e387882196931163bcf">e580e5b8</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-02-04T09:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not build StgCRunAsm.S for unregisterised builds
For unregisterised builds StgRun/StgReturn are implemented via a mini
interpreter in StgCRun.c and therefore would collide with the
implementations in StgCRunAsm.S.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3b0bd97cb92706b3cee38b2ec13349ca22ecf7d">e3b0bd97</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-02-04T09:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fixup! fixup! Do not build StgCRunAsm.S for unregisterised builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb629fab96fbff43f79190767731501d8642f524">eb629fab</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-02-04T09:29:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Delete some superfluous helper functions in HscMain
The driver code is some of the nastiest in GHC, and I am worried about
being able to untangle all the tech debt. In `HscMain` we have a number
of helpers which are either not-used or little used. I delete them so we
can reduce cognative load, distilling the essential complexity away from
the cruft.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c90eca550ccf89c8eb880e4428a43a9d0e8203f0">c90eca55</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-05T09:21:29-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Record type constraints arising from existentials in `PmCoreCt`s
In #17703 (a follow-up of !2192), we established that contrary to my
belief, type constraints arising from existentials in code like
```hs
data Ex where Ex :: a -> Ex
f _ | let x = Ex @Int 15 = case x of Ex -> ...
```
are in fact useful.
This commit makes a number of refactorings and improvements to comments,
but fundamentally changes `addCoreCt.core_expr` to record the type
constraint `a ~ Int` in addition to `x ~ Ex @a y` and `y ~ 15`.
Fixes #17703.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d3b5d5706a8fcfe724ee0a042d5f7c18880ccba">6d3b5d57</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-05T09:22:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testlib: Extend existing *_opts in extra_*_opts
Previously we'd override the existing {run,hc} opts in
extra_{run,hc}_opts, which caused flakiness in T1969, see #17712.
extra_{run,hc}_opts now extends {run,hc} opts, instead of overriding.
Also we shrank the allocation area for T1969 in order to increase
residency sampling frequency.
Fixes #17712
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9c89a48dd88b566a23b670ce707208e8c4cf28c1">9c89a48d</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-05T09:22:52-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove CafInfo-related code from STG lambda lift pass
After c846618ae0 we don't have accurate CafInfos for Ids in the current
module and we're free to introduce new CAFFY or non-CAFFY bindings or
change CafInfos of existing binders; so no we no longer need to
maintain CafInfos in Core or STG passes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70ddb8bf3066a2e70cffb49b100b640830bec7e1">70ddb8bf</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-02-05T09:23:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17773
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8004e5d1e993363a89b0107380604c5bc02be6b">e8004e5d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-05T13:55:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows builds to fail again
Due to T7702 and the process issues described in #17777.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29b72c00a692b442605b022fcc15c4454ed1c3de">29b72c00</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">VarSet: Introduce nonDetFoldVarSet
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c4e6b35daef9336ea6b0922bab595cb02ac742b5">c4e6b35d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move closeOverKinds and friends to TyCoFVs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed2f0e5c38f1dfc9cf049ae63c56117cda99116e">ed2f0e5c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reform the free variable finders for types
This patch delivers on (much of) #17509.
* Introduces the shallow vs deep free variable distinction
* Introduce TyCoRep.foldType,
foldType :: Monoid a => TyCoFolder env a
-> env -> Type -> a
and use it in the free variable finders.
* Substitution in TyCoSubst
* ASSERTs are on for checkValidSubst
* checkValidSubst uses shallowTyCoVarsOfTypes etc
Quite a few things still to do
* We could use foldType in lots of other places
* We could use mapType for substitution. (Check that we get
good code!)
* Some (but not yet all) clients of substitution can now
save time by using shallowTyCoVarsOfTypes
* All calls to tyCoVarsOfTypes should be inspected; most of
them should be shallow. Maybe.
* Currently shallowTyCoVarsOfTypes still returns
unification variables, but not CoVarHoles.
Reason: we need to return unification variables
in some of the calls in TcSimplify, eg when promoting.
* We should do the same thing for tyCoFVsOfTypes, which is
currently unchanged.
* tyCoFVsOfTypes returns CoVarHoles, because of the
use in TcSimplify.mkResidualConstraints. See
Note [Emitting the residual implication in simplifyInfer]
* #17509 talks about "relevant" variables too.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/01a1f4fbb1bb62ed621421622f6a15d30c91b3c3">01a1f4fb</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for noFreeVarsOfType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0e59afd66788fc704999d1987cd351fa165d3c46">0e59afd6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify closeOverKinds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ca5c88e6370c2cafed6b63fe217f70e87d7fcea">9ca5c88e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for coVarsOfType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5541b87c498cdd320e9a18d2134e571d713536e1">5541b87c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:55:41-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use foldTyCo for exactTyCoVarsOfType
This entailed
* Adding a tcf_view field to TyCoFolder
* Moving exactTyCoVarsOtType to TcType. It properly belongs
there, since only the typechecker calls this function. But
it also means that we can "see" and inline tcView.
Metric Decrease:
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c1228511f2dd4d262c04edb8539174a7de810b2">7c122851</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-06T11:56:02-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/588acb99bc3cb377ceb76447dd60656b4a11de5a">588acb99</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-02-08T10:15:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">slightly better named cost-centres for simple pattern bindings #17006
```
main = do
print $ g [1..100] a
where g xs x = map (`mod` x) xs
a :: Int = 324
```
The above program previously attributed the cost of computing 324 to a cost
centre named `(...)`, with this change the cost is attributed to `a` instead.
This change only affects simple pattern bindings (decorated variables: type
signatures, parens, ~ annotations and ! annotations).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/309f8cfdad9cf81f5ee6003821810ea1205ae1d5">309f8cfd</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-08T10:16:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unnecessary parentheses
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7755ffc2920facb7ed74efe379ad825feeaf1024">7755ffc2</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-08T10:16:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce IsPass; refactor wrappers.
There are two main payloads of this patch:
1. This introduces IsPass, which allows e.g. printing
code to ask what pass it is running in (Renamed vs
Typechecked) and thus print extension fields. See
Note [IsPass] in Hs.Extension
2. This moves the HsWrap constructor into an extension
field, where it rightly belongs. This is done for
HsExpr and HsCmd, but not for HsPat, which is left
as an exercise for the reader.
There is also some refactoring around SyntaxExprs, but this
is really just incidental.
This patch subsumes !1721 (sorry @chreekat).
Along the way, there is a bit of refactoring in GHC.Hs.Extension,
including the removal of NameOrRdrName in favor of NoGhcTc.
This meant that we had no real need for GHC.Hs.PlaceHolder, so
I got rid of it.
Updates haddock submodule.
-------------------------
Metric Decrease:
haddock.compiler
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d452be454857549679b93a0682a3f6fedf5d7c1">7d452be4</a></strong>
<div>
<span>by Dylan Yudaken</span>
<i>at 2020-02-08T10:17:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix hs_try_putmvar losing track of running cap
If hs_try_putmvar was called through an unsafe import, it would lose track of the running cap causing a deadlock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c2e301aeeae353a64be43e5fa9e7d464797d5648">c2e301ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Qualify imports of Data.List
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aede171a59f9b7b8022548c385a1cb8c4589f905">aede171a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix -Wcompat-unqualified-imports issues
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4435a8e0b74337fe5faddb9c46691f0f5bf9e653">4435a8e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce -Wcompat-unqualified-imports
This implements the warning proposed in option (B) of the
Data.List.singleton CLC [discussion][].
This warning, which is included in `-Wcompat` is intended to help users
identify imports of modules that will change incompatibly in future GHC
releases. This currently only includes `Data.List` due to the expected
specialisation and addition of `Data.List.singleton`.
Fixes #17244.
[discussion]: https://groups.google.com/d/msg/haskell-core-libraries/q3zHLmzBa5E/PmlAs_kYAQAJ
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/28b5349a1ae88872e343c58c270fe90329f14d87">28b5349a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:17:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump stm and process submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d04b9f298c9cc0ff291e0717826743f488670bb">7d04b9f2</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:18:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Allow override of Cabal configuration in hadrian.settings
Fixes #17612 by adding a `cabal.configure.opts` key for
`hadrian.settings`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88bf81aaaf67e9c9bb5b12088ab33accd4a55fb3">88bf81aa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-08T10:19:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Optimize unpackCString# to allocate less.
unpackCString# is a recursive function which for each iteration
returns a Cons cell containing the current Char, and a thunk for
unpacking the rest of the string.
In this patch we change from storing addr + offset inside this thunk
to storing only the addr, simply incrementing the address on each
iteration.
This saves one word of allocation per unpacked character.
For a program like "main = print "<largishString>" this amounts
to 2-3% fewer % in bytes allocated.
I also removed the now redundant local unpack definitions.
This removes one call per unpack operation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bec76733b818b0489ffea0834ab6b1560207577c">bec76733</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:19:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix GhcThreaded setting
This adopts a patch from NetBSD's packaging fixing the `GhcThreaded`
option of the make build system. In addition we introduce a `ghcThreaded`
option in hadrian's `Flavour` type.
Also fix Hadrian's treatment of the `Use Threaded` entry in `settings`.
Previously it would incorrectly claim `Use Threaded = True` if we were
building the `threaded` runtime way. However, this is inconsistent with
the `make` build system, which defines it to be whether the `ghc`
executable is linked against the threaded runtime.
Fixes #17692.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/545cf1e184a37295245086040750d77a809db16e">545cf1e1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:20:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Depend upon libray dependencies when configuring packages
This will hopefully fix #17631.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/047d3d75b2861e6dd3c0ba21daf50b012e5a7fd3">047d3d75</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:21:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #15316
This is the full testcase for T15316.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/768e58664ffd408e5c4e3bea8f00a650cd0c6501">768e5866</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-08T10:22:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc(Data.List): Add some examples to Data.List
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3900cb83fb10b0209fb5fb1d713bf3aaf3ee42b8">3900cb83</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-08T10:22:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/GHC/List.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd6667665f160f07550b25e9c80fbc197ae2f642">bd666766</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:22:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Clarify that bundled patsyns were introduced in GHC 8.0
Closes #17094.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95741ea1f93c6d9bac055eb620c8bcda0ec5c72d">95741ea1</a></strong>
<div>
<span>by Pepe Iborra</span>
<i>at 2020-02-08T10:23:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update to hie-bios 0.3.2 style program cradle
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb5c19122ea59d1c6758762cb47e1a451bc3b9bf">fb5c1912</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-08T10:24:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove redundant case
This alternative is redundant and triggers no warning when building with 8.6.5
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5d83d9489f383cc940ce123d9385c5cad1af517d">5d83d948</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-08T10:24:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add mkHieFileWithSource which doesn't read the source file from disk
cc/ @pepeiborra
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dfdae56d2ea9b9841e747c36cdff63a826045805">dfdae56d</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-08T10:25:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghcAssert to stgAssert in hp2ps/Main.h.
This fixes #17763</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/658f7ac67472a880e19397773edd35a6214ed995">658f7ac6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:26:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">includes: Avoid using single-line comments in HsFFI.h
While single-line comments are supported by C99, dtrace on SmartOS
apparently doesn't support them yet.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c95920a6371768276e439811e99f4822571ff4df">c95920a6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-08T10:26:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Import qualified Prelude in parser
This is in preparation of backwards-incompatible changes in happy.
See https://github.com/simonmar/happy/issues/166
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b6dc319a2d83a8a8c426d0ad6f46d0b8fad41253">b6dc319a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-08T10:27:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #12760
The bug seems to be fixed in the meantime, make sure it stays fixed.
Closes #12760
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3857b62cb74ef50cbe88ab898aae946ca933365">b3857b62</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-08T10:28:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Drop out-of-date comment
The comment in GHC.Base claimed that ($) couldn't be used in that module
as it was wired-in. However, this is no longer true; ($) is merely known
key and is defined in Haskell (with a RuntimeRep-polymorphic type) in
GHC.Base.
The one piece of magic that ($) retains is that it a special typing
rule to allow type inference with higher-rank types
(e.g. `runST $ blah`; see Note [Typing rule for ($)] in TcExpr).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1183ae94a256b30bfe12ddc5e1c29d6f46abd79d">1183ae94</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-02-08T10:29:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix Arena blocks accounting for MBlock sized allocations
When requesting more than BLOCKS_PER_MBLOCK blocks allocGroup can return a
different number of blocks than requested. Here we use the number of
requested blocks, however arenaFree will subtract the actual number of
blocks we got from arena_blocks (possibly) resulting in a negative value
and triggering ASSERT(arena_blocks >= 0).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97d59db55e3b32861d91783c36d56e5c93f2cd19">97d59db5</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-02-08T10:29:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix need_prealloc being reset when retainer profiling is on
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f630025d457807c4a9da513e4a0823e4643b2a6">1f630025</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-09T02:52:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a test for #15712
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ac784ab381aae936ee3be7c8685e0203ee4dbf6">2ac784ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-09T02:53:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add --test-metrics argument
Allowing the test metric output to be captured to a file, a la
the METRIC_FILE environment variable of the make build system.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f432d8c64058d3d00d917f0bc65feb1bf9f7aecb">f432d8c6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-09T02:53:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix --test-summary argument
This appears to be a cut-and-paste error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a906595f060b9c038332f16adaf664eeb1d50f2e">a906595f</a></strong>
<div>
<span>by Arnaud Spiwack</span>
<i>at 2020-02-09T02:53:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an outdated note link
This link appears to have been forgotten in
0dad81ca5fd1f63bf8a3b6ad09787559e8bd05c0 .
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ae83da13f03d22a4d810b5d9c0f37f818cb6a00">3ae83da1</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-09T02:54:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Windows fixes (bindists, CI)
This commit implements a few Windows-specific fixes which get us from a CI
job that can't even get as far as starting the testsuite driver, to a state
where we can run the entire testssuite (but have test failures to fix).
- Don't forget about a potential extension for the haddock program, when
preparing the bindist.
- Build the timeout program, used by the testsuite driver on Windows in place
of the Python script used elsewhere, using the boot compiler. We could
alternatively build it with the compiler that we're going to test but this
would be a lot more tedious to write.
- Implement a wrapper-script less installation procedure for Windows, in
`hadrian/bindist/Makefile.
- Make dependencies a bit more accurate in the aforementioned Makefile.
- Update Windows/Hadrian CI job accordingly.
This patch fixes #17486.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82f9be8c6aafb70f612e72bef517c76437726c78">82f9be8c</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-09T02:55:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #14628: Panic (No skolem Info) in GHCi
This patch implements the [sugggestion from Simon (PJ)](https://gitlab.haskell.org/ghc/ghc/issues/14628#note_146559):
- Make `TcErrors.getSkolemInfo` return a `SkolemInfo` rather than an `Implication`.
- If `getSkolemInfo` gets `RuntimeUnk`s, just return a new data constructor in `SkolemInfo`, called `RuntimeUnkSkol`.
- In `TcErrors.pprSkols` print something sensible for a `RuntimeUnkSkol`.
The `getSkolemInfo` function paniced while formating suggestions to add type annotations (subfunction `suggestAddSig`)
to a *"Couldn't match type ‘x’ with ‘y’"* error message.
The `getSkolemInfo` function didn't find any Implication value and paniced.
With this patch the `getSkolemInfo` function does no longer panic, if it finds `RuntimeUnkSkol`s.
As the panic occured while processing an error message, we don't need to implement any new error message!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2e18e26c34424ab814453a73404429cdf1a4d4a">b2e18e26</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-09T02:55:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix -ddump-stg-final.
Once again make sure this dumps the STG used for codegen.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/414e2f626321f8eba8b2d5cc38dcc1a528351d83">414e2f62</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-09T02:56:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Force -fPIC for intree GMP (fix #17799)
Configure intree GMP with `--with-pic` instead of patching it. Moreover
the correct patching was only done for x86_64/darwin (see #17799).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0fd72ee042aa011af7d870febcfead01a424370">f0fd72ee</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-09T17:22:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for improvements to the pattern-match checker [skip ci]
A little late to the game, but better late than never.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/00dc0f7e66a18ab50931325cb6333a2bfd2a6650">00dc0f7e</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-09T17:23:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #13142
Closes #13142
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f3e737bbcae7290856450ff9c8b0c7e31fca0c10">f3e737bb</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-10T20:04:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix long distance info for record updates
For record updates where the `record_expr` is a variable, as in #17783:
```hs
data PartialRec = No
| Yes { a :: Int, b :: Bool }
update No = No
update r@(Yes {}) = r { b = False }
```
We should make use of long distance info in
`-Wincomplete-record-updates` checking. But the call to `matchWrapper`
in the `RecUpd` case didn't specify a scrutinee expression, which would
correspond to the `record_expr` `r` here. That is fixed now.
Fixes #17783.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5670881d7779ecd7eee8c969dab66ee343298532">5670881d</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-10T20:05:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fs: Fix UNC remapping code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/375b3c45be0e5de673d03097ebbad442c85c89eb">375b3c45</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-02-11T05:07:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add singleton to Data.OldList
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de32beffde82eec954691703541a2d4081799453">de32beff</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-02-11T05:08:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not create nested quantified constraints
Previously, we would accidentally make constraints like
forall a. C a => forall b. D b => E a b c as we traversed
superclasses. No longer!
This patch also expands Note [Eagerly expand given superclasses]
to work over quantified constraints; necessary for T16502b.
Close #17202 and #16502.
test cases: typecheck/should_compile/T{17202,16502{,b}}
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e319570ec141e0f63d82d23b88a40f96fc0b7105">e319570e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Use nanosleep instead of usleep
usleep was removed in POSIX.1-2008.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b75e7486de73868e6821a9f680e9e13794dff15c">b75e7486</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:09:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Remove incorrect assertions around MSG_THROWTO messages
Previously we would assert that threads which are sending a
`MSG_THROWTO` message must have their blocking status be blocked on the
message. In the usual case of a thread throwing to another thread this
is guaranteed by `stg_killThreadzh`. However, `throwToSelf`, used by
the GC to kill threads which ran out of heap, failed to guarantee this.
Noted while debugging #17785.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aba51b65863db5f2687f29d10ba24ffa49dabd3b">aba51b65</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-11T05:10:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add arithmetic exception primops (#14664)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b157399f987c31574968719a52a5b00f2acfb36a">b157399f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-11T05:10:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Don't assume Gnu linker on Solaris
Compl Yue noticed that the linker was dumping the link map on SmartOS. This is
because Smartos uses the Solaris linker, which uses the `-64` flag, not
`-m64` like Gnu ld, to indicate that it should link for 64-bits. Fix the
configure script to handle the Solaris linker correctly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d8d73d779e615ae352934864a347222f175ca277">d8d73d77</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-11T05:11:18-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Notes only: telescopes
This documentation-only patch fixes #17793
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58a4ddeff7730d160dd66f19c288f8b5b27679e3">58a4ddef</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-11T05:12:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: build (and ship) iserv on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/82023524ff050f26bf00be3432a97f1e537caf41">82023524</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-11T18:04:17-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TemplateHaskellQuotes: Allow nested splices
There is no issue with nested splices as they do not require any compile
time code execution. All execution is delayed until the top-level
splice.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/50e24eddbac3d3b34003ad985fe6126aa0f83e0f">50e24edd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-11T18:04:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Hadrian's copy of (Data.Functor.<&>)
The function was added to base with base-4.11 (GHC 8.4)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f82a2f90ceda5c2bc74088fa7f6a7c8cb9c9756f">f82a2f90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-12T01:56:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document GMP build [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/da7f74797e8c322006eba385c9cbdce346dd1d43">da7f7479</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-12T01:57:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: ByteCode and Runtime (cf #13009)
Update haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04f51297e3d7bcf7be0dc7db4673cc3e6f9156ea">04f51297</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-12T01:58:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix naming of tests for #12923
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31fc332191a6298e2643261482e9b43a4b38241b">31fc3321</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-12T01:58:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #12926
Closes #12926
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0c0ee7d9a942a19361e72553cd08f42cc12b04a">f0c0ee7d</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-12T01:58:51-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix order of arguments in specializer (#17801)
See https://gitlab.haskell.org/ghc/ghc/issues/17801#note_253330
No regression test, as it's hard to trigger.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/059c3c9d7c84fc37c69e9f414ff736d47081e72c">059c3c9d</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-12T11:00:58+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Separate CPR analysis from the Demand analyser
The reasons for that can be found in the wiki:
https://gitlab.haskell.org/ghc/ghc/wikis/nested-cpr/split-off-cpr
We now run CPR after demand analysis (except for after the final demand
analysis run just before code gen). CPR got its own dump flags
(`-ddump-cpr-anal`, `-ddump-cpr-signatures`), but not its own flag to
activate/deactivate. It will run with `-fstrictness`/`-fworker-wrapper`.
As explained on the wiki page, this step is necessary for a sane Nested
CPR analysis. And it has quite positive impact on compiler performance:
Metric Decrease:
T9233
T9675
T9961
T15263
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5ffd8d9ec776db708e690c4fdbf671afa8df48f">f5ffd8d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-12T17:22:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Expose GHC.Unicode.unicodeVersion
This exposes a Data.Version.Version representing the version of the
Unicode database used by `base`. This should clear up some confusion I
have seen in tickets regarding with which Unicode versions a given GHC
can be expected to work.
While in town I also regenerated (but did not update) the Unicode
database with database 12.0.0. Strangely, the file cited in the README
no longer existed. Consequently, I used
https://www.unicode.org/Public/12.0.0/ucd/UnicodeData.txt and was
slightly surprised to find that there were a few changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c2585e0816cb49487fa6a2be5b8e3f191cf3438">6c2585e0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-12T17:22:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Update Unicode database to 12.1.0
Using `curl https://www.unicode.org/Public/12.1.0/ucd/UnicodeData.txt |
libraries/base/cbits/ubconfc 12.1.0`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/df08468113ab46832b7ac0a7311b608d1b418c4d">df084681</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-12T23:58:52+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Always display inferred variables using braces
We now always show "forall {a}. T" for inferred variables,
previously this was controlled by -fprint-explicit-foralls.
This implements part 1 of https://github.com/ghc-proposals/ghc-proposals/pull/179.
Part of GHC ticket #16320.
Furthermore, when printing a levity restriction error, we now display
the HsWrap of the expression. This lets users see the full elaboration with
-fprint-typechecker-elaboration (see also #17670)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/16d643cfe661716c7a6cb3ce04893a732c5a42af">16d643cf</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove -ddump-srts flag
This flag is deemed not useful.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa28ae95e4c1ff5b70bf3f8dc6e54fb994bbfa51">fa28ae95</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix flag documentation (#17826)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bfd825943f6077836361ddc788fb40f2421e283">1bfd8259</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-13T09:16:43-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ensure that Hadrian is built correctly before using it
When Hadrian failed to build, the script would pick a previously built
Hadrian (if available) instead of failing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd6e786a28cc6688b45c8868a3e8a338b081ba01">cd6e786a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-14T05:29:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #17648
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f2c3677b3a08d8ea6c0d1f5fd51e43b7fcfe75b">9f2c3677</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:30:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GMP expects the Target platform as --host parameter
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa6086fdf53aef690369771def6cf1c31faa38e8">aa6086fd</a></strong>
<div>
<span>by Oleg Grenrus</span>
<i>at 2020-02-14T05:31:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add explicit LANGUAGE Safe to template-haskell
(cherry picked from commit a5e0f376821ca882880b03b07b451aa574e289ec)</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af6a0c36431639655762440ec8d652796b86fe58">af6a0c36</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T05:31:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add execution and target architecture to stage-compilation figure
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf739945b8b28ff463dc44925348f20b3c1f22cb">cf739945</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:32:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Module hierarchy: HsToCore (cf #13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/719db3180e3fb0fa95fcfc90feb51ffbb2a2096d">719db318</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-14T05:33:16-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">De-duplicate overlapping Notes
Documentation only. Fixes #17827
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7550417ac866e562bb015149d8f9a6b8c97b5f84">7550417a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-14T05:33:56-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: drop Sphinx flag checking for PDF documentation (#17825)
It seems that Sphinx produces the ghc-flags.txt in
doc/users_guide/_build rather than pdfRoot. We could copy ghc-flags.txt
into pdfRoot (like happens naturally in the HTML case) but the benefit
is pretty small. Let's just only check the HTML case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/813842f42023457ccb4d93b5906e0f492e4721b2">813842f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">make: Be more selective in building windows-extra-src tarball
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0725f4bbc7f59282ee5fe41619099957030d85ff">0725f4bb</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rework handling of win32 toolchain tarballs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/565ce7aee5db966070f9d0267f99a13532d5caf0">565ce7ae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Consolidate CI logic
This moves nearly all of the CI logic to .gitlab/ci.sh. This improves
things in a number of ways:
* it's harder for inconsistencies to arise between architectures
* it's easier to share logic between architectures
* on Windows, it's easier to ensure that all CI steps are executed from
within a properly initialized mingw session.
While in town I also add a FreeBSD build job and update the Windows job
to use the gitlab-runner PowerShell executor, since cmd.exe will be
deprecated soon (fixing #17699).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9cbace74dadf6fe64267f0b68635402f5c848b72">9cbace74</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Deduplicate nightly job configuration
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e8371442dc6130a03e648a0e1bc0f1bdfdbfe91">6e837144</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">integer-gmp: Fix unused command-line argument
-L is only needed during linking.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5ee07ab565c1bf7a33d3bd4bcd3fb6c7b100d1c">e5ee07ab</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't ask sed to operate in-place on symlinks
Some sed implementations (e.g. FreeBSD) refuse to operate in-place on
symlinks.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71e5e68fd3794cc63f513d30d467e43761a8ce62">71e5e68f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Disable tests that assume name of libstdc++ on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2da0f429f45ad2d945b4b041e1d58477ce7567">7b2da0f4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T6132 as broken on FreeBSD
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ef7a15a0c59b4ceff7f6343cabca8497c0eef50">8ef7a15a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite/T16930: Don't rely on gnu grep specific --include
In BSD grep this flag only affects directory recursion.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6060003e4f95101adaef0b2c7f26154c59f2e83a">6060003e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass -Wno-unused-command-line-arguments during link on FreeBSD
FreeBSD cc throws a warning if we pass -pthread without actually using
any pthread symbols.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97497baeb70c443030e9e0c59abf4930679b4f82">97497bae</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Always clamp reads/writes to 2GB in length
Previously we did this only on Darwin due to #17414. However, even on
other platforms >2GB writes are on shaky ground. POSIX explicitly says
that the result is implementation-specified and Linux will write at most
0x7ffff000, even on 64-bit platforms. Moreover, getting the sign
of the syscall result correct is tricky, as demonstrated by the fact
that T17414 currently fails on FreeBSD.
For simplicity we now just uniformly clamp to 0x7ffff000 on all
platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49be2a3fc5e9f6ca71717cde6889c49dbba816da">49be2a3f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: Fix sphinx version test
The check for the "v" prefix is redundant.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7f7a556f9b89303da4e1c3475e618653d830cc4">f7f7a556</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix unknown link targets
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a204102c634743faac8af345ad8bfec6317e7024">a204102c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs/compare-flags: Don't use python f-strings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92e15a379a675f14667d7b80db608c84e58aa0a8">92e15a37</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix various shellcheck warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/459f7c6e29eed46f8a5be8fac02c45450080a67c">459f7c6e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Drop empty arguments from target list
Fixes #17748.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c06df28dd490d0309e0b1885a6121b45f74edf3c">c06df28d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix "invalid file" failure
I have no idea how this worked previously. Different Python version?
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3fe8444f7e3904be14956f3fe68583da8b730ab4">3fe8444f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark T7702 as fragile on Windows
Due to #16799. There was previously an attempt to mark it as broken but
the `opsys` name was incorrect.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe02f78172f06fd3e83ba00246d9ed741474e653">fe02f781</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Assert the opsys names are known
Previously opsys would take any string. This meant it was very easy for
a typo to silently render the predicate ineffective. Fix this by
checking the given operating system name against a list of known values.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/149e2a3a85d92b4afea1643e7e6ed7861d620be2">149e2a3a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compare-flags: Don't rely on encoding flag of subprocess.check_output
Apparently it isn't supported by some slightly older Python versions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/798d59f6a2b517db50ec2536a8331d610a2b379c">798d59f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add more debug output to failed path in onIOComplete
This will help track down #17035.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e35f3f98b085a6bd925bef1b97f81a3117358e8c">e35f3f98</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:16:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow i386 Windows builds to fail again
Due to the resistance of #17736 to resolution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/261a3cf83b757f6422acafa6e436ea7bb05ff532">261a3cf8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Build integer-simple job in the validate flavour
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b613a961be70e75747816be4d7642b6378a84c3f">b613a961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Always use mingw64 python on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1bc8c8cd02726c5151afdb02a019aec724be8bec">1bc8c8cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow Windows build to fail due to #17777
The fact that `exec` isn't POSIX compliant means that things can break
in arbitrarily bad ways. Sometimes things happen to work correctly but
sadly this isn't always the case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac63020d3c9960d12efef54003dd088f8ec0413b">ac63020d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop unnecessary GHC_VERSION check
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6926f369b8740c1c8095eb0786010d9da9c5fcfd">6926f369</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Folds in the second part of Phyx's Windows process exit fixes [1],
hopefully finally resolving issue #17480.
[1] https://github.com/haskell/process/pull/160
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/584eee71f803ebf59f12758755151110a6e8636f">584eee71</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Use "process job" when spawning processes on Windows
GHC should make calls using process jobs when calling out to GCC and LD.
The reason is these use the exec () family of posix functions. Window's
process model doesn't allow replacement of processes so this is emulated
by creating a new process and immediately exiting the old one. Because
of this when using normal Windows wait functions you would return even
without the child process having finished. In this case if you are
depending on data from the child you will enter a race condition.
The usual fix for this is to use process jobs and wait for the
termination of all children that have ever been spawn by the process you
called. But also waiting for the freeing of all resources.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ecabfa28518947d752403bc1b59ee716652687da">ecabfa28</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "compiler: Disable atomic renaming on Windows"
The original reason this was disabled should be fixed by the previous
commit.
This reverts commit 1c1b63d63efe8b0f789aa7d5b87cfac3edd213eb.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06d60c66d6355e895c7e46275f295b721d63fa92">06d60c66</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Cabal submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cabb384775adacf8326f7dd2cf99291da8dddbb">8cabb384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compare-flags: Fix output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8cf646d36b02b8ea1c289cb52781c9171853b514">8cf646d3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Document -ddump-srts
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/932307a5486e63335f9ee6dc183ff39f6dfc5857">932307a5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-14T10:17:00-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix broken reference
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e77818de9cc9b2bc4b19dba4bc479f14078760b7">e77818de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-15T09:26:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept performance changes
These manifested in the integer-simple job.
Metric Decrease:
T12227
T5549
T14936
T4830
Conversions
T5237
T8766
T4801
T10359
Metric Increase:
T12234
T6048
T3294
T14683
T3064
T9872b
T9872c
T783
T5837
T10678
T14697
T5631
T9203
T13719
T12707
T13056
T9630
T10547
T9872d
T1969
WWRec
T10370
T5321FD
haddock.Cabal
T5642
T9872a
T15263
T12425
MultiLayerModules
T5205
T9233
T13379
haddock.base
T9020
T13035
T12150
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/785008c1235bd77ddb4d13f57f92b249752d8ea5">785008c1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-15T09:30:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Sort test names in expected change output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e851472e59950c9d7ada3224a5bf317c0a9dc1a">9e851472</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-16T10:38:41+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "users-guide: Document -ddump-srts"
This reverts commit 8cf646d36b02b8ea1c289cb52781c9171853b514.
The flag was removed by 16d643cf.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9792c81663d8bef3abfe22cf45405d8d282afe08">9792c816</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-16T09:47:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Probe whether symlinks are usable on Windows
Closes #17706.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee1e5342f612c8b06ac910cd698558ade7a1a887">ee1e5342</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-16T09:47:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the "unused terminals: 2" warning in Parser.y
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4a8ce525fce56eca18358820c0ec35fec8982de">b4a8ce52</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-18T20:14:42-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">If a :reload finds syntax errors in the module graph, remove the loaded modules. (Fixes #17549)
The processing in `compiler/main/GhcMake.hs` computes the ModuleGraph. If it finds errors
in the module header or in the import specifications, then the new module graph is
incomplete and should not be used.
The code before #17549 just reported the errors and left the old ModuleGraph in place.
The new code of this MR replaces the old ModuleGraph with an empty one.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d7029cc09edc052c2f97effe33233c53340fcce0">d7029cc0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-18T20:15:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: refactor GMP in-tree build support (#17756)
* Hadrian doesn't use integer-gmp/config.mk file anymore to determine if
building GMP in-tree is required.
"config.mk" is created by Cabal when the integer-gmp package is
configured and this file is still untracked by Hadrian. This led to a
tricky configure "race" because "config.mk" is built by the
"setup-config" rule, but this rule is also used to find dependencies,
in particular the "ghc-gmp.h" header, but the creation of this file
was depending (without being tracked) on "config.mk".
Now Hadrian only builds in-tree GMP if `--with-intree-gmp` is passed
to the top-level configure script.
* in-tree GMP isn't built once for all in a fixed stage (Stage1)
anymore. It is built per stage which is required if we build a
cross-compiler
* switching between in-tree and external GMP is now supported without
having to clean the build directory first.
* "wrappers.c" now includes "ghc-gmp.h" instead of "ghc.h". It
helps ensuring that the build system generates "ghc-gmp.h".
* build in-tree GMP in "<root>/stageN/gmp/gmpbuild" and produce useful
artefacts (libgmp.a, gmp.h, objs/*.o) in "<root>/stageN/gmp"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40d917fb3b99bdb63e7e39d517225d441aaf722d">40d917fb</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-18T20:16:07-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove the MonadFail P instance
There were two issues with this instance:
* its existence meant that a pattern match failure in the P monad would
produce a user-visible parse error, but the error message would not be
helpful to the user
* due to the MFP migration strategy, we had to use CPP in Lexer.x,
and that created issues for #17750
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a1ce45d6cf03802caf15548210bb9924468c437">5a1ce45d</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-02-18T20:16:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix unboxed tuple size limit (#17837)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/192caf58ca1fc42806166872260d30bdb34dbace">192caf58</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-18T20:17:24-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix testsuite driver output (#17847)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1500f0898e85316c7c97a2f759d83278a072ab0e">1500f089</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-18T20:18:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Llvm (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d53e81c02c64e72ccb55bf73f0881c5c80fa50ef">d53e81c0</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-02-20T10:36:22-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for atomic .o writes [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19680ee533bb95c0c5c42aca5c81197e4b233979">19680ee5</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-02-20T10:37:53-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">8.10 Release notes for --disable-delayed-os-memory-return [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74ad75e87317196c600dfabc61aee1b87d95c214">74ad75e8</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-20T21:17:57-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-implement unsafe coercions in terms of unsafe equality proofs
(Commit message written by Omer, most of the code is written by Simon
and Richard)
See Note [Implementing unsafeCoerce] for how unsafe equality proofs and
the new unsafeCoerce# are implemented.
New notes added:
- [Checking for levity polymorphism] in CoreLint.hs
- [Implementing unsafeCoerce] in base/Unsafe/Coerce.hs
- [Patching magic definitions] in Desugar.hs
- [Wiring in unsafeCoerce#] in Desugar.hs
Only breaking change in this patch is unsafeCoerce# is not exported from
GHC.Exts, instead of GHC.Prim.
Fixes #17443
Fixes #16893
NoFib
-----
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS -0.1% 0.0% -0.0% -0.0% -0.0%
CSD -0.1% 0.0% -0.0% -0.0% -0.0%
FS -0.1% 0.0% -0.0% -0.0% -0.0%
S -0.1% 0.0% -0.0% -0.0% -0.0%
VS -0.1% 0.0% -0.0% -0.0% -0.0%
VSD -0.1% 0.0% -0.0% -0.0% -0.1%
VSM -0.1% 0.0% -0.0% -0.0% -0.0%
anna -0.0% 0.0% -0.0% -0.0% -0.0%
ansi -0.1% 0.0% -0.0% -0.0% -0.0%
atom -0.1% 0.0% -0.0% -0.0% -0.0%
awards -0.1% 0.0% -0.0% -0.0% -0.0%
banner -0.1% 0.0% -0.0% -0.0% -0.0%
bernouilli -0.1% 0.0% -0.0% -0.0% -0.0%
binary-trees -0.1% 0.0% -0.0% -0.0% -0.0%
boyer -0.1% 0.0% -0.0% -0.0% -0.0%
boyer2 -0.1% 0.0% -0.0% -0.0% -0.0%
bspt -0.1% 0.0% -0.0% -0.0% -0.0%
cacheprof -0.1% 0.0% -0.0% -0.0% -0.0%
calendar -0.1% 0.0% -0.0% -0.0% -0.0%
cichelli -0.1% 0.0% -0.0% -0.0% -0.0%
circsim -0.1% 0.0% -0.0% -0.0% -0.0%
clausify -0.1% 0.0% -0.0% -0.0% -0.0%
comp_lab_zift -0.1% 0.0% -0.0% -0.0% -0.0%
compress -0.1% 0.0% -0.0% -0.0% -0.0%
compress2 -0.1% 0.0% -0.0% -0.0% -0.0%
constraints -0.1% 0.0% -0.0% -0.0% -0.0%
cryptarithm1 -0.1% 0.0% -0.0% -0.0% -0.0%
cryptarithm2 -0.1% 0.0% -0.0% -0.0% -0.0%
cse -0.1% 0.0% -0.0% -0.0% -0.0%
digits-of-e1 -0.1% 0.0% -0.0% -0.0% -0.0%
digits-of-e2 -0.1% 0.0% -0.0% -0.0% -0.0%
dom-lt -0.1% 0.0% -0.0% -0.0% -0.0%
eliza -0.1% 0.0% -0.0% -0.0% -0.0%
event -0.1% 0.0% -0.0% -0.0% -0.0%
exact-reals -0.1% 0.0% -0.0% -0.0% -0.0%
exp3_8 -0.1% 0.0% -0.0% -0.0% -0.0%
expert -0.1% 0.0% -0.0% -0.0% -0.0%
fannkuch-redux -0.1% 0.0% -0.0% -0.0% -0.0%
fasta -0.1% 0.0% -0.5% -0.3% -0.4%
fem -0.1% 0.0% -0.0% -0.0% -0.0%
fft -0.1% 0.0% -0.0% -0.0% -0.0%
fft2 -0.1% 0.0% -0.0% -0.0% -0.0%
fibheaps -0.1% 0.0% -0.0% -0.0% -0.0%
fish -0.1% 0.0% -0.0% -0.0% -0.0%
fluid -0.1% 0.0% -0.0% -0.0% -0.0%
fulsom -0.1% 0.0% +0.0% +0.0% +0.0%
gamteb -0.1% 0.0% -0.0% -0.0% -0.0%
gcd -0.1% 0.0% -0.0% -0.0% -0.0%
gen_regexps -0.1% 0.0% -0.0% -0.0% -0.0%
genfft -0.1% 0.0% -0.0% -0.0% -0.0%
gg -0.1% 0.0% -0.0% -0.0% -0.0%
grep -0.1% 0.0% -0.0% -0.0% -0.0%
hidden -0.1% 0.0% -0.0% -0.0% -0.0%
hpg -0.1% 0.0% -0.0% -0.0% -0.0%
ida -0.1% 0.0% -0.0% -0.0% -0.0%
infer -0.1% 0.0% -0.0% -0.0% -0.0%
integer -0.1% 0.0% -0.0% -0.0% -0.0%
integrate -0.1% 0.0% -0.0% -0.0% -0.0%
k-nucleotide -0.1% 0.0% -0.0% -0.0% -0.0%
kahan -0.1% 0.0% -0.0% -0.0% -0.0%
knights -0.1% 0.0% -0.0% -0.0% -0.0%
lambda -0.1% 0.0% -0.0% -0.0% -0.0%
last-piece -0.1% 0.0% -0.0% -0.0% -0.0%
lcss -0.1% 0.0% -0.0% -0.0% -0.0%
life -0.1% 0.0% -0.0% -0.0% -0.0%
lift -0.1% 0.0% -0.0% -0.0% -0.0%
linear -0.1% 0.0% -0.0% -0.0% -0.0%
listcompr -0.1% 0.0% -0.0% -0.0% -0.0%
listcopy -0.1% 0.0% -0.0% -0.0% -0.0%
maillist -0.1% 0.0% -0.0% -0.0% -0.0%
mandel -0.1% 0.0% -0.0% -0.0% -0.0%
mandel2 -0.1% 0.0% -0.0% -0.0% -0.0%
mate -0.1% 0.0% -0.0% -0.0% -0.0%
minimax -0.1% 0.0% -0.0% -0.0% -0.0%
mkhprog -0.1% 0.0% -0.0% -0.0% -0.0%
multiplier -0.1% 0.0% -0.0% -0.0% -0.0%
n-body -0.1% 0.0% -0.0% -0.0% -0.0%
nucleic2 -0.1% 0.0% -0.0% -0.0% -0.0%
para -0.1% 0.0% -0.0% -0.0% -0.0%
paraffins -0.1% 0.0% -0.0% -0.0% -0.0%
parser -0.1% 0.0% -0.0% -0.0% -0.0%
parstof -0.1% 0.0% -0.0% -0.0% -0.0%
pic -0.1% 0.0% -0.0% -0.0% -0.0%
pidigits -0.1% 0.0% -0.0% -0.0% -0.0%
power -0.1% 0.0% -0.0% -0.0% -0.0%
pretty -0.1% 0.0% -0.1% -0.1% -0.1%
primes -0.1% 0.0% -0.0% -0.0% -0.0%
primetest -0.1% 0.0% -0.0% -0.0% -0.0%
prolog -0.1% 0.0% -0.0% -0.0% -0.0%
puzzle -0.1% 0.0% -0.0% -0.0% -0.0%
queens -0.1% 0.0% -0.0% -0.0% -0.0%
reptile -0.1% 0.0% -0.0% -0.0% -0.0%
reverse-complem -0.1% 0.0% -0.0% -0.0% -0.0%
rewrite -0.1% 0.0% -0.0% -0.0% -0.0%
rfib -0.1% 0.0% -0.0% -0.0% -0.0%
rsa -0.1% 0.0% -0.0% -0.0% -0.0%
scc -0.1% 0.0% -0.1% -0.1% -0.1%
sched -0.1% 0.0% -0.0% -0.0% -0.0%
scs -0.1% 0.0% -0.0% -0.0% -0.0%
simple -0.1% 0.0% -0.0% -0.0% -0.0%
solid -0.1% 0.0% -0.0% -0.0% -0.0%
sorting -0.1% 0.0% -0.0% -0.0% -0.0%
spectral-norm -0.1% 0.0% -0.0% -0.0% -0.0%
sphere -0.1% 0.0% -0.0% -0.0% -0.0%
symalg -0.1% 0.0% -0.0% -0.0% -0.0%
tak -0.1% 0.0% -0.0% -0.0% -0.0%
transform -0.1% 0.0% -0.0% -0.0% -0.0%
treejoin -0.1% 0.0% -0.0% -0.0% -0.0%
typecheck -0.1% 0.0% -0.0% -0.0% -0.0%
veritas -0.0% 0.0% -0.0% -0.0% -0.0%
wang -0.1% 0.0% -0.0% -0.0% -0.0%
wave4main -0.1% 0.0% -0.0% -0.0% -0.0%
wheel-sieve1 -0.1% 0.0% -0.0% -0.0% -0.0%
wheel-sieve2 -0.1% 0.0% -0.0% -0.0% -0.0%
x2n1 -0.1% 0.0% -0.0% -0.0% -0.0%
--------------------------------------------------------------------------------
Min -0.1% 0.0% -0.5% -0.3% -0.4%
Max -0.0% 0.0% +0.0% +0.0% +0.0%
Geometric Mean -0.1% -0.0% -0.0% -0.0% -0.0%
Test changes
------------
- break006 is marked as broken, see #17833
- The compiler allocates less when building T14683 (an unsafeCoerce#-
heavy happy-generated code) on 64-platforms. Allocates more on 32-bit
platforms.
- Rest of the increases are tiny amounts (still enough to pass the
threshold) in micro-benchmarks. I briefly looked at each one in a
profiling build: most of the increased allocations seem to be because
of random changes in the generated code.
Metric Decrease:
T14683
Metric Increase:
T12150
T12234
T12425
T13035
T14683
T5837
T6048
Co-Authored-By: Richard Eisenberg <rae@cs.brynmawr.edu>
Co-Authored-By: Ömer Sinan Ağacan <omeragacan@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6880d6aa1e6e96579bbff89712efd813489cc828">6880d6aa</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:18:48-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disentangle DynFlags and SDoc
Remove several uses of `sdocWithDynFlags`. The remaining ones are mostly
CodeGen related (e.g. depend on target platform constants) and will be
fixed separately.
Metric Decrease:
T12425
T9961
WWRec
T1969
T14683
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70a901105044c85c756fd93899387f0215f7b1de">70a90110</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-02-20T21:19:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc(List): Add examples to GHC.List
* Add examples
* Cleanup documentation
* Clarify merge process and Marge bot
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c8439fc789ff00cfdd453d2425d2146df69e0729">c8439fc7</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-02-20T21:20:05-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix testsuite on powerpc64le
Remove expect broken on recomp tests, #11260 was closed
by !2264 and #11323 most likely by !2264 as well.
GHCi scripts tests work on GHCi but not the external interpreter,
adjust test configuration accordingly. Fixes unexpected passes.
Mark test requiring DWARF expect fail on powerpc64[le] for #11261.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65b7256a88ae2bd878da5d026e4183cba6f6eedf">65b7256a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-20T21:20:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use concatMap(M) instead of `concat . map` and the monadic variant
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b76d4574d703ee66f346775d408220fdddb8155">8b76d457</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-20T21:21:28-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17832: Weird handling of exports named main in 8.10-rc1
Switching from `lookupGlobalOccRn_maybe` to `lookupInfoOccRn`
to check whether a `main` function is in scope. Unfortunately
`lookupGlobalOccRn_maybe` complains if there are multiple `main`
functions in scope.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/466e1ad5d54cb2e8a3b6f16904b873cad882a736">466e1ad5</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-20T21:22:11-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use TTG for HsSplicedT constructor
The constructor HsSplicedT occurs only in the GhcTc pass.
This enforces this fact statically via TTG.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e622fcabb30ab7f3836bfc5739747b5608bef43">4e622fca</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-02-20T21:22:49-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Normalize types when dropping absent arguments from workers
fixes #17852
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a533e54722ec2ec22ef598e07dcfe6c9e84d2602">a533e547</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-02-20T21:23:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mention users guide and release notes in merge request template</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05251b175b3745ed96c9f672115c78c527b63b9e">05251b17</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:24:08-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix typo in BIN_DIST_PREP_TAR_COMP variable name</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f44c7e6723498c5dde0cd78e4af26142a14d98f4">f44c7e67</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:24:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Avoid duplicating ~/.cabal contents with every build
Previously our attempt to cache the cabal store would
`cp cabal-cache ~/.cabal`. However, if the latter already
existed this meant that we would end up with
~/.cabal/cabal-cache. Not only would this not help caching
but it would exponentially grow the size of ~/.cabal. Not
good!</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c5ec996583373025488c090fb2c89f7bda38c1cb">c5ec9965</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Hs.Extension: Use Type instead of *
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89cb4cc4cc76f834b0bcc53fb551db706ef143b7">89cb4cc4</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use Type instead of * in GHC
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04eb0d6c4de23a4cfe3953e7496f5bc4b5b1d53c">04eb0d6c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:13-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable -Wstar-is-type in -Wall
As noted in [proposal 0143][proposal] this is supposed to happen in
8.12.
Also fix an incorrect claim in the users guide that -Wstar-is-type is
enabled by default.
[proposal]: https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0143-remove-star-kind.rst
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6de966f1369740d00193e64ec82d11e934256616">6de966f1</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-02-20T21:56:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17724 by having occAnal preserve used bindings.
It sometimes happened that occAnal would remove bindings
as dead code by relying on bindings to be in dependency
order. The fix was contributed by SPJ.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abd7f962a9a9207c07cb864921941750818f61a4">abd7f962</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-20T21:56:15-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Mention dependency on `exceptions` in release notes
Fixes #17845.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/581753790da8d094ce05b3fc5f5360f5fbf6a7da">58175379</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:20-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: minor GMP refactoring
Somehow I forgot to totally remove `gmpContext` in
d7029cc09edc052c2f97effe33233c53340fcce0. This patch fixes it and adds
some additional comments.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33fa8d9433d82b03f3209698bf27420a32302321">33fa8d94</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-02-20T21:56:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalize liftData to work over any Quote (#17857)
The Overloaded Quotations proposal generalized the type of `lift`
to work over any `Quote`, but not the type of `liftData`, leading
to #17857. Thankfully, generalizing `liftData` is extremely
straightforward.
Fixes #17857.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cea67955a5ae7d3de7aa9dcfdabaf6ee3681ffc">3cea6795</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make: fix sdist target (#17848)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2cce997320652031e0c6cc62db5e35deff43a79">e2cce997</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-20T21:56:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix source-dist target (#17849)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a4c89b208c59ddf79c55ee446fcad5a012bb1bc">0a4c89b2</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-21T20:44:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case `mkTyConApp liftedTypeKind []`
We really need to make sure that these are shared because otherwise GHC
will allocate thousands of identical `TyConApp` nodes.
See #17292
-------------------------
Metric Decrease:
haddock.Cabal
T14683
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0482f58ab0490b2394ad60946dde3214a0ca1810">0482f58a</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-02-21T20:45:21-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TH: wrapGenSyns, don't split the element type too much
The invariant which allowed the pervious method of splitting the type of
the body to find the type of the elements didn't work in the new
overloaded quotation world as the type can be something like
`WriterT () m a` rather than `Q a` like before.
Fixes #17839
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/be7068a6130f394dcefbcb5d09c2944deca2270d">be7068a6</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-21T20:45:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser API annotations: RealSrcLoc
During parsing, GHC collects lexical information about AST nodes and
stores it in a map. It is needed to faithfully restore original source
code, e.g. compare these expressions:
a = b
a = b
The position of the equality sign is not recorded in the AST, so it must
be stored elsewhere.
This system is described in Note [Api annotations].
Before this patch, the mapping was represented by:
Map (SrcSpan, AnnKeywordId) SrcSpan
After this patch, the mapping is represented by:
Map (RealSrcSpan, AnnKeywordId) RealSrcSpan
The motivation behind this change is to avoid using the Ord SrcSpan
instance (required by Map here), as it interferes with #17632 (see the
discussion there).
SrcSpan is isomorphic to Either String RealSrcSpan, but we shouldn't
use those strings as Map keys. Those strings are intended as hints to
the user, e.g. "<interactive>" or "<compiler-generated code>", so they
are not a valid way to identify nodes in the source code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/240f5bf6f53515535be5bf3ef7632aa69ae21e3e">240f5bf6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-21T20:46:40-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Driver (#13009)
submodule updates: nofib, haddock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d09411122b9b534b96e988b6d3f6d7eb04b8f66">9d094111</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-21T20:47:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: `docs` rule needs `configure` (#17840)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1674353a1ab40fde183f22bef9eb019d8150dc5a">1674353a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-23T17:31:19-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fs: Port fixes from ghc-jailbreak repository
* Override rename, unlink, and remove
* Factor out wchar conversion
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/853210f20699b54dee4f85a15b70b3f02a1b68b7">853210f2</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:32:03-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">show gcc linker options in configure summary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2831544aaab15ab17d66e7af42f890d92d47407a">2831544a</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:32:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: docs depend on stage1 ghc
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d9df9e00b021724d570a12d8c6d7870bdc054ca">1d9df9e0</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-23T17:33:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci: after 5ce63d52fed the linux bindist for doc-tarball has changed name
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/26e8fff33b1b46ba559538b4519730c60c0d45e5">26e8fff3</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-24T02:05:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Ord SrcLoc, Ord SrcSpan
Before this patch, GHC relied on Ord SrcSpan to identify source elements, by
using SrcSpan as Map keys:
blackList :: Map SrcSpan () -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map SrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
Firstly, this design is not valid in presence of UnhelpfulSpan, as it
distinguishes between UnhelpfulSpan "X" and UnhelpfulSpan "Y", but those
strings are messages for the user, unfit to serve as identifiers for source
elements.
Secondly, this design made it hard to extend SrcSpan with additional data.
Recall that the definition of SrcSpan is:
data SrcSpan =
RealSrcSpan !RealSrcSpan
| UnhelpfulSpan !FastString
Say we want to extend the RealSrcSpan constructor with additional information:
data SrcSpan =
RealSrcSpan !RealSrcSpan !AdditionalInformation
| UnhelpfulSpan !FastString
getAdditionalInformation :: SrcSpan -> AdditionalInformation
getAdditionalInformation (RealSrcSpan _ a) = a
Now, in order for Map SrcSpan to keep working correctly, we must *ignore* additional
information when comparing SrcSpan values:
instance Ord SrcSpan where
compare (RealSrcSpan r1 _) (RealSrcSpan r2 _) = compare r1 r2
...
However, this would violate an important law:
a == b therefore f a == f b
Ignoring AdditionalInformation in comparisons would mean that with
f=getAdditionalInformation, the law above does not hold.
A more robust design is to avoid Ord SrcSpan altogether, which is what this patch implements.
The mappings are changed to use RealSrcSpan instead:
blackList :: Set RealSrcSpan -- compiler/GHC/HsToCore/Coverage.hs
instanceMap :: Map RealSrcSpan Name -- compiler/GHC/HsToCore/Docs.hs
All SrcSpan comparisons are now done with explicit comparison strategies:
SrcLoc.leftmost_smallest
SrcLoc.leftmost_largest
SrcLoc.rightmost_smallest
These strategies are not subject to the law mentioned above and can easily
discard both the string stored in UnhelpfulSpan and AdditionalInformation.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aa6c18866cf4071246891da3b0f7651b5d28d0f">5aa6c188</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Shuffle text
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3f1741356491332613aacf66c96991682b84603">e3f17413</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Drop old release notes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84dd96105faff71cb17d1c1d069d724d014847dc">84dd9610</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-24T02:06:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump directory submodule to 1.3.6.0
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e295a02440db8b1d96cebad22c5ee48774774681">e295a024</a></strong>
<div>
<span>by Stefan Pavikevik</span>
<i>at 2020-02-24T20:53:44-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">check for safe arguments, raising error when invalid (fix #17720)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/354e2787be08fb6d973de1a39e58080ff8e107f8">354e2787</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-24T20:54:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments, small refactor
* Remove outdated Note [HsForAllTy tyvar binders] and [Context quantification].
Since the wildcard refactor 1e041b7382, HsForAllTy no longer has an flag
controlling explicity. The field `hsq_implicit` is gone too.
The current situation is covered by Note [HsType binders] which is already
linked from LHsQTyVars.
* Small refactor in CoreLint, extracting common code to a function
* Remove "not so sure about WpFun" in TcEvidence, per Richard's comment
https://gitlab.haskell.org/ghc/ghc/merge_requests/852#note_223226
* Use mkIfThenElse in Foreign/Call, as it does exactly what we need.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b1067d14b656bbbfa7c47f156ec2700c9751549">1b1067d1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-24T20:55:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: CmmToAsm (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/621468f680a111c20366a9445a3b225cbc34ffbf">621468f6</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-02-26T15:08:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Treat coercions as arguments for floating and inlining
This reverts commit 8924224ecfa065ebc67b96a90d01cf9d2edd0e77
and fixes #17787.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/def486c90ef6f37d81d0d9c6df754431ff94c6a4">def486c9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Allow libnuma library path to be specified
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ed03d4e76ead6384e38bb742fee73905d92d1545">ed03d4e7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Refactor gmp arguments
Move the gmp configuration to its own binding.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09b8838422d5dde32af7b09c8adcb4dff4cd00fb">09b88384</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:08:47-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Tell Cabal about integer-gmp library location
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/161e08c5d85d7ee7f731db31481cd818480f07a7">161e08c5</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-26T15:09:30-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
* FailablePattern can no longer be created since ab51bee40c82
Therefore, Opt_WarnMissingMonadFailInstances has no effect anymore.
* XWrap is no longer used, it was moved to an extension field
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e0d09db377bcb3d4caef2abe9db0cac36811d740">e0d09db3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use 8.8.3 to bootstrap on Windows
This should fix #17861.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/972bcf3a1971691ec809452322404ce8f65ad721">972bcf3a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix symlink test
Needs to `write` bytes, not str.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/273e60dee183707315415799ae3ed08079ab9ee9">273e60de</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add shell subcommand for debugging within CI environment
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/43b13ed33f50274383a8dce11cbd7c77b8e851d5">43b13ed3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Fix colors on Darwin
Darwin sh doesn't support \e.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/217546a798e1eb5a931a677771bbd54bb0e4b5ee">217546a7</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Flush stdout buffers in InitEventLogging
Otherwise we are sensitive to libc's buffering strategy.
Similar to the issue fixed in 543dfaab166c81f46ac4af76918ce32190aaab22.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7d4fa55d19f7ac72f3071f9d19e03443c9b538c">c7d4fa55</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add run_hadrian subcommand
I've ruined two trees already by failing to pass --flavour to hadrian.
Let's factor this out so it can be reused during troubleshooting.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7dc54873c0768ad3234c40300ae20e4f1e847bdd">7dc54873</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Allow tests to be marked as broken on the command line
This allows us to work-around distribution-specific breakage easily.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25e2458ee9e8007687c165fe6b27adf91f405ed0">25e2458e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add --broken-test flag
This exposes the flag of the same name supported by the testsuite
driver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/557699967f9438d3bf2936cbc6edce55b11622e0">55769996</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Mark some tests as broken on Alpine
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9ee7f87dbea786259d12fb9177fd2759d4fad3bb">9ee7f87d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Don't use process jobs if they are broken
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfaa39618a25ae642221a478889b9667281b52e8">bfaa3961</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
Fixes name of C compiler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2b49a0aad353201678970c76d8305a5dcb1bfab">b2b49a0a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-26T15:10:09-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Make hasMetricsFile RHS more descriptive
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/817f93eac4d13f680e8e3e7a25eb403b1864f82e">817f93ea</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-26T15:10:58-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core (#13009)
Update haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74311e10bbb6ced9cd3093c8949f2535a715d8f6">74311e10</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-02-27T16:22:45-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Implement Long-distance information with Covered sets
Consider
```hs
data T = A | B | C
f :: T -> Int
f A = 1
f x = case x of
A -> 2
B -> 3
C -> 4
```
Clearly, the RHS returning 2 is redundant. But we don't currently see
that, because our approximation to the covered set of the inner case
expression just picks up the positive information from surrounding
pattern matches. It lacks the context sensivity that `x` can't be `A`
anymore!
Therefore, we adopt the conceptually and practically superior approach
of reusing the covered set of a particular GRHS from an outer pattern
match. In this case, we begin checking the `case` expression with the
covered set of `f`s second clause, which encodes the information that
`x` can't be `A` anymore. After this MR, we will successfully warn about
the RHS returning 2 being redundant.
Perhaps surprisingly, this was a great simplification to the code of
both the coverage checker and the desugarer.
Found a redundant case alternative in `unix` submodule, so we have to
bump it with a fix.
Metric Decrease:
T12227
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/59c023ba5ccb10fff62810591f20608bd73c97af">59c023ba</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-27T16:23:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">configure: correctly generate LIBRARY_template_haskell_VERSION
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9be82389a702c09d03975e7a0c17e5866dc17ffc">9be82389</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-02-28T02:35:35-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">boot: Remove remote origin check
Previously, we used relative paths in submodules. When cloning from
GitHub, they had to be manually tweaked.
Since a76b233d we use absolute paths, so this workaround can be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4b6b594fae6b257e997ade3fae67b3378e54a22">f4b6b594</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-28T02:36:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix marking in compact regions
Previously we were tracing the object we were asked to mark, even if it
lives in a compact region. However, there is no need to do this; we need
only to mark the region itself as live.
I have seen a segfault due to this due to the concurrent mark seeing a
an object in the process of being compacted by the mutator.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f97d1fb614ff7638d13eb7c552d2a72fce4c613a">f97d1fb6</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-02-28T02:36:59-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: use an explicit import list in System.Environment.ExecutablePath
This was making -Werror builds fail on Windows (at least with Hadrian).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66f5d6d634698ce054a9b9ce0c53ce9682f6f042">66f5d6d6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-02-28T22:03:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error handling for VTA + deferred type errors
This fixes #17792
See Note [VTA for out-of-scope functions] in TcExpr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/37f126033f1e5bf0331143f005ef90ba6e2e02cd">37f12603</a></strong>
<div>
<span>by Ilias Tsitsimpis</span>
<i>at 2020-02-28T22:04:04-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add arm-unknown-linux-gnueabi
Add arm-unknown-linux-gnueabi, which is used by Debian's ARM EABI port
(armel), as an LLVM target.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/327b29e1a05d9f1ea04465c9b23aed92473dd453">327b29e1</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-02-29T05:06:31-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Monotonic locations (#17632)
When GHC is parsing a file generated by a tool, e.g. by the C preprocessor, the
tool may insert #line pragmas to adjust the locations reported to the user.
As the result, the locations recorded in RealSrcLoc are not monotonic. Elements
that appear later in the StringBuffer are not guaranteed to have a higher
line/column number.
In fact, there are no guarantees whatsoever, as #line pragmas can arbitrarily
modify locations. This lack of guarantees makes ideas such as #17544
infeasible.
This patch adds an additional bit of information to every SrcLoc:
newtype BufPos = BufPos { bufPos :: Int }
A BufPos represents the location in the StringBuffer, unaffected by any
pragmas.
Updates haddock submodule.
Metric Increase:
haddock.Cabal
haddock.base
haddock.compiler
MultiLayerModules
Naperian
parsing001
T12150
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99d2de860ff82e3f626c8b3d47d355ab16d18fd1">99d2de86</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-02-29T05:07:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">plugins: Ensure that loadInterface plugins can see annotations
loadInterface replaces the `mi_decls`, `mi_insts`, `mi_fam_insts`,
`mi_rules`, `mi_anns` fields of ModIface with `undefined` before
inserting the interface into the EPS. However, we still want to give
loadInterface plugins access to these fields. Consequently, we want to
pass the unmodified `ModIface` the plugin.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a999ee96a22650b59855609f84e2808b4133e9e0">a999ee96</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-02-29T05:07:50-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghci.sh and build.sh to ghci and build respectively
Convert hadrian buildscripts to unsuffixed, dashed form
final cleanups
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b5fb58fd1a4a24b9273d9d2de65b6347e1654e98">b5fb58fd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-29T05:08:36-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document and refactor a few things around bitmap scavenging
- Added a few comments in StgPAP
- Added a few comments and assertions in scavenge_small_bitmap and
walk_large_bitmap
- Did tiny refactor in GHC.Data.Bitmap: added some comments, deleted
dead code, used PlatformWordSize type.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18757cab04c5c5c48eaceea19469d4811c5d0371">18757cab</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-29T05:09:25-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor runtime interpreter code
In #14335 we want to be able to use both the internal interpreter (for
the plugins) and the external interpreter (for TH and GHCi) at the same
time.
This patch performs some preliminary refactoring: the `hsc_interp` field
of HscEnv replaces `hsc_iserv` and is now used to indicate which
interpreter (internal, external) to use to execute TH and GHCi.
Opt_ExternalInterpreter flag and iserv options in DynFlags are now
queried only when we set the session DynFlags. It should help making GHC
multi-target in the future by selecting an interpreter according to the
selected target.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b86a639504e1de79c861a2c11b897089cc63ae5f">b86a6395</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-29T05:10:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: correct relative links to haddocks from users guide (fixes #17866)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f55df7f197b7e30d7c6e39d80deb36b7dc86fb5">0f55df7f</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-02-29T05:10:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: correct link to th haddocks from users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/252e51179bd179f52e25dea762ef7b95bc56ce0a">252e5117</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-02-29T05:10:46-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: enforce POSIX numeric locale for heap profiles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34c7d23074f47c720b5722ca14d78a34213eabb6">34c7d230</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-02-29T05:11:27-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Hadrian's ``--configure`` (fix #17883)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04d30137771a6cf8a18fda1ced25f78d0b2eb204">04d30137</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-02-29T05:12:06-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify IfaceIdInfo type
IfaceIdInfo type is confusing: there's practically no difference between
`NoInfo` and `HasInfo []`. The comments say NoInfo is used when
-fomit-interface-pragmas is enabled, but we don't need to distinguish
`NoInfo` from `HasInfo []` in when reading the interface so the
distinction is not important.
This patch simplifies the type by removing NoInfo. When we have no info
we use an empty list.
With this change we no longer read the info list lazily when reading an
IfaceInfoItem, but when reading an IfaceId the ifIdInfo field is
read lazily, so I doubt this is going to be a problem.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3979485bd97771373214c44d14b7830ba447ad23">3979485b</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-02-29T17:36:59+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Show breakpoint locations of breakpoints which were ignored during :force (#2950)
GHCi is split up into 2 major parts: The user-interface (UI)
and the byte-code interpreter. With `-fexternal-interpreter`
they even run in different processes. Communication between
the UI and the Interpreter (called `iserv`) is done using
messages over a pipe. This is called `Remote GHCI` and
explained in the Note [Remote GHCi] in `compiler/ghci/GHCi.hs`.
To process a `:force` command the UI sends a `Seq` message
to the `iserv` process. Then `iserv` does the effective
evaluation of the value. When during this process a breakpoint
is hit, the `iserv` process has no additional information to
enhance the `Ignoring breakpoint` output with the breakpoint
location.
To be able to print additional breakpoint information,
there are 2 possible implementation choices:
1. Store the needed information in the `iserv` process.
2. Print the `Ignoring breakpoint` from the UI process.
For option 1 we need to store the breakpoint info redundantely
in 2 places and this is bad. Therfore option 2 was implemented
in this MR:
- The user enters a `force` command
- The UI sends a `Seq` message to the `iserv` process.
- If processing of the `Seq` message hits a breakpoint,
the `iserv` process returns control to the UI process.
- The UI looks up the source location of the breakpoint,
and prints the enhanced `Ignoring breakpoint` output.
- The UI sends a `ResumeSeq` message to the `iserv` process,
to continue forcing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3cf7303bf39bca734bd87f0f42872f1a4025fa34">3cf7303b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-02T01:18:33-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove dead code
* The names in PrelName and THNames are no longer used
since TH merged types and kinds, Typeable is kind-polymorphic,
.net support was removed
* unqualQuasiQuote no longer used since 6f8ff0bbad3b9fa3
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dbea7e9d4d4a8812f3dbeed720fb6aa97e16f896">dbea7e9d</a></strong>
<div>
<span>by Ilias Tsitsimpis</span>
<i>at 2020-03-02T01:19:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not define hs_atomic{read,write}64() on non-64bit
Do not define hs_atomicread64() and hs_atomicwrite64() on machines where
WORD_SIZE_IN_BITS is less than 64, just like we do with the rest of the atomic
functions which work on 64-bit values.
Without this, compilation fails on MIPSel and PowerPC with the following error:
/usr/bin/ld: /<<PKGBUILDDIR>>/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.3_p.a(atomic.p_o): in function `hs_atomicread64':
atomic.c:(.text.hs_atomicread64+0x8): undefined reference to `__sync_add_and_fetch_8'
/usr/bin/ld: /<<PKGBUILDDIR>>/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.3_p.a(atomic.p_o): in function `hs_atomicwrite64':
atomic.c:(.text.hs_atomicwrite64+0x38): undefined reference to `__sync_bool_compare_and_swap_8'
Fixes #17886.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c0c76fb1a11532076a0342655a9c889a2a12768">7c0c76fb</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-03-02T17:13:55-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set `ImpredicativeTypes` during :print command. (#14828)
If ImpredicativeTypes is not enabled, then `:print <term>` will fail if the
type of <term> has nested `forall`s or `=>`s.
This is because the GHCi debugger's internals will attempt to unify a
metavariable with the type of <term> and then display the result, but if the
type has nested `forall`s or `=>`s, then unification will fail.
As a result, `:print` will bail out and the unhelpful result will be
`<term> = (_t1::t1)` (where `t1` is a metavariable).
Beware: <term> can have nested `forall`s even if its definition doesn't use
RankNTypes! Here is an example from #14828:
class Functor f where
fmap :: (a -> b) -> f a -> f b
Somewhat surprisingly, `:print fmap` considers the type of fmap to have
nested foralls. This is because the GHCi debugger sees the type
`fmap :: forall f. Functor f => forall a b. (a -> b) -> f a -> f b`.
We could envision deeply instantiating this type to get the type
`forall f a b. Functor f => (a -> b) -> f a -> f b`,
but this trick wouldn't work for higher-rank types.
Instead, we adopt a simpler fix: enable `ImpredicativeTypes` when using
`:print` and friends in the GHCi debugger. This is allows metavariables
to unify with types that have nested (or higher-rank) `forall`s/`=>`s,
which makes `:print fmap` display as
`fmap = (_t1::forall a b. Functor f => (a -> b) -> f a -> f b)`, as expected.
Although ImpredicativeTypes is a somewhat unpredictable from a type inference
perspective, there is no danger in using it in the GHCi debugger, since all
of the terms that the GHCi debugger deals with have already been typechecked.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2a2f51d79f145e015cc089d97cf71c19dd27bee4">2a2f51d7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-02T17:14:38-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use configure script to detect that we should use in-tree GMP on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c663c2c2ff0d79b2c7cfadb0ce961339f1e7e4c">8c663c2c</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-04T16:12:14+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Be explicit about how stack usage of mvar primops are covered.
This fixes #17893
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cedd6f3041de6abe64dfa3257bec7730a9dced9f">cedd6f30</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add getCurrentThreadCPUTime helper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ace618cd2294989e783bd453cee88e0e1c0dad77">ace618cd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving-gc: Track time usage of nonmoving marking
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/022b5ad5775ecf6652e663cddb2773d7230385f2">022b5ad5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Stats: Add sync pauses to +RTS -S output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/067632342cf2f063b0f23c255740e2717e5e14c7">06763234</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-05T14:53:12-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Report nonmoving collector statistics in machine-readable output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70d2b9956d1ecc9d40d1e2d4920983af00ea846d">70d2b995</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-09T06:10:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix collection of sparks
Previously sparks living in the non-moving heap would be promptly GC'd
by the minor collector since pruneSparkQueue uses the BF_EVACUATED flag,
which non-moving heap blocks do not have set.
Fix this by implementing proper support in pruneSparkQueue for
determining reachability in the non-moving heap. The story is told in
Note [Spark management in the nonmoving heap].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9668781a36941e7552fcec38f6d4e1d5ec3ef6d1">9668781a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-09T06:11:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable Sphinx documentation in Alpine build</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8eb2c2639494bed3326163df52fa13de941cd047">8eb2c263</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Windows breakage by not touching locales on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b8dab057f0730a324b7cb7b74a11152f6b96a889">b8dab057</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ensure C numerics in heap profiles using Windows locales if needed
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7d95260f0b9a91186eb6a99d6235151a22b2c5ae">7d95260f</a></strong>
<div>
<span>by Jean-Baptiste Mazon</span>
<i>at 2020-03-09T16:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: refactor and comment profile locales
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b62781336aff0007aa5fde261c3028a82543a09">5b627813</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-09T16:34:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use InstanceSigs in GND/DerivingVia-generated code (#17899)
Aside from making the generated code easier to read when
`-ddump-deriv` is enabled, this makes the error message in `T15073`
substantially simpler (see the updated `T15073` expected stderr).
Fixes #17899.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70b5077820a0859d22edd29885b62eef3c363058">70b50778</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-10T02:05:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">SysTools: Ensure that error parser can handle absolute paths on Windows
This fixes #17786, where the error parser fails to correctly handle the
drive name in absolute Windows paths.
Unfortunately I couldn't find a satisfactory way to test this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85b861d822251486fdf900ee951c275ebd8dfcb3">85b861d8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-10T02:05:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #17786
This isn't pretty but it's perhaps better than nothing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ee2c50cbeead0d865a02a963f3f3c72e298398d7">ee2c50cb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-10T02:06:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: track missing configure results
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ca8f51d475a69583a228f118e6b9dac98ba483d3">ca8f51d4</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-10T02:07:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for T17904
Closes #17904
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5fa9cb82223de1c1c2684aa6917bf85a2e3c6469">5fa9cb82</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-10T12:29:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">anyRewritableTyVar now looks in RuntimeReps
Previously, anyRewritableTyVar looked only at the arg and res
of `arg -> res`, but their RuntimeReps are also subject to
rewriting. Easy to fix.
Test case: typecheck/should_compile/T17024
Fixes #17024.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ba01d83a2078acce789a9d5f111efa4d4ffc616">5ba01d83</a></strong>
<div>
<span>by Ben Price</span>
<i>at 2020-03-10T12:30:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clarify a Lint message
When developing a plugin I had a shadowing problem, where I generated
code
app = \f{v r7B} x{v r7B} -> f{v r7B} x{v r7B}
This is obviously wrong, since the occurrence of `f` to the right of the
arrow refers to the `x` binder (they share a Unique). However, it is
rather confusing when Lint reports
Mismatch in type between binder and occurrence
Var: x{v rB7}
since it is printing the binder, rather than the occurrence.
It is rather easy to read this as claiming there is something wrong with
the `x` occurrence!
We change the report to explicitly print both the binder and the
occurrence variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b2c827b7b68f0ade7f4ae66e7033fdb84d75a5f">7b2c827b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-10T12:31:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments only
Clarify code added in #17852 and MR !2724
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3300eeacbbf7a3d1f961f809be5d236c48827b28">3300eeac</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-10T12:31:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Misc cleanup
- Remove Note [Existentials in shift_con_pat].
The function shift_con_pat has been removed 15 years ago in 23f40f0e9be6d4.
- Remove kcLookupTcTyCon - it's the same as tcLookupTcTyCon
- Remove ASSERT in tyConAppArgN. It's already done by getNth,
and it's the only reason getNth exists.
- Remove unused function nextRole
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abf5736bcad2d740b5854e2e4a9b3547b9b06639">abf5736b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-10T18:05:01+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Typos in comments [skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb586f894532baf1bcb822afd0df7f9fea198671">bb586f89</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-11T00:14:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Prefer darwin-specific getCurrentThreadCPUTime
macOS Catalina now supports a non-POSIX-compliant version of clock_gettime
which cannot use the clock_gettime codepath.
Fixes #17906.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20800b9a9e88a8784a3ee8720544f504aba7b4f7">20800b9a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T08:17:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Split GHC.Iface.Utils module
* GHC.Iface.Recomp: recompilation avoidance stuff
* GHC.Iface.Make: mkIface*
Moved `writeIfaceFile` into GHC.Iface.Load alongside `readIface` and
renamed it `writeIface` for consistency.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1daa20298880487b2a351c88f7ade840eb4632c6">1daa2029</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-03-11T08:17:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fixed a minor typo in codegen.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bc23338b02ffd624247ace409ab690b2b4a6186">0bc23338</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-11T08:18:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-quantify when generalising over rewrite rule types
Previously, `tcRules` would check for naughty quantification
candidates (see `Note [Naughty quantification candidates]` in
`TcMType`) when generalising over the type of a rewrite rule. This
caused sensible-looking rewrite rules (like those in #17710) to be
rejected. A more permissing (and easier-to-implement) approach is to
do what is described in `Note [Generalising in tcTyFamInstEqnGuts]`
in `TcTyClsDecls`: just re-quantify all the type variable binders,
regardless of the order in which the user specified them. After all,
the notion of type variable specificity has no real meaning in
rewrite rules, since one cannot "visibly apply" a rewrite rule.
I have written up this wisdom in
`Note [Re-quantify type variables in rules]` in `TcRules`.
As a result of this patch, compiling the `ExplicitForAllRules1` test
case now generates one fewer warning than it used to. As far as I can
tell, this is benign, since the thing that the disappearing warning
talked about was also mentioned in an entirely separate warning.
Fixes #17710.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/336eac7ef049ba9feab5a948120f0f732e26f773">336eac7e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-11T08:19:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci056 and ghcilink004 as fragile in unreg
As noted in #17018.
Also fix fragile declaration of T13786, which only runs in the normal
way.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c61b9b02925acf248cde1ec0f67730c1a6f6c6e5">c61b9b02</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-11T08:19:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Deepen call stack for isIn
I see quite a few warnings like:
WARNING: file compiler/utils/Util.hs, line 593
Over-long elem in unionLists
But the call stack is uninformative. Better to add HasDebugCallStack
to isIn. Ditto isn'tIn.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3aa9b35fcc417ab39d8da633482fe64dc9f898b1">3aa9b35f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-11T08:20:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Zero any slop after compaction in compacting GC
In copying GC, with the relevant debug flags enabled, we release the old
blocks after a GC, and the block allocator zeroes the space before
releasing a block. This effectively zeros the old heap.
In compacting GC we reuse the blocks and previously we didn't zero the
unused space in a compacting generation after compaction. With this
patch we zero the slop between the free pointer and the end of the block
when we're done with compaction and when switching to a new block
(because the current block doesn't have enough space for the next object
we're shifting).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8e6febcee4b91a88a5027baac4bee5a8847fe79b">8e6febce</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor GHC.Driver.Session (Ways and Flags)
* extract flags and ways into their own modules (with some renaming)
* remove one SOURCE import of GHC.Driver.Session from GHC.Driver.Phases
* when GHC uses dynamic linking (WayDyn), `interpWays` was only
reporting WayDyn even if the host was profiled (WayProf). Now it
returns both as expected (might fix #16803).
* `mkBuildTag :: [Way] -> String` wasn't reporting a canonical tag for
differently ordered lists. Now we sort and nub the list to fix this.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bc41e47123b205a45385a3aa69de97ce22686423">bc41e471</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor interpreterDynamic and interpreterProfiled
* `interpreterDynamic` and `interpreterProfiled` now take `Interp`
parameters instead of DynFlags
* slight refactoring of `ExternalInterp` so that we can read the iserv
configuration (which is pure) without reading an MVar.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a6989971379c26d8c288551d536149675e009e34">a6989971</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-11T20:33:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a Set to represent Ways
Should make `member` queries faster and avoid messing up with missing
`nubSort`.
Metric Increase:
hie002
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb93a1a4405b448e83cad973f93dab3f7f050736">cb93a1a4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-11T20:34:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DeriveFunctor-generated code require fewer beta reductions
Issue #17880 demonstrates that `DeriveFunctor`-generated code is
surprisingly fragile when rank-_n_ types are involved. The culprit is
that `$fmap` (the algorithm used to generate `fmap` implementations)
was too keen on applying arguments with rank-_n_ types to lambdas,
which fail to typecheck more often than not.
In this patch, I change `$fmap` (both the specification and the
implementation) to produce code that avoids creating as many lambdas,
avoiding problems when rank-_n_ field types arise.
See the comments titled "Functor instances" in `TcGenFunctor` for a
more detailed description. Not only does this fix #17880, but it also
ensures that the code that `DeriveFunctor` generates will continue
to work after simplified subsumption is implemented (see #17775).
What is truly amazing is that #17880 is actually a regression
(introduced in GHC 7.6.3) caused by commit
49ca2a37bef18aa57235ff1dbbf1cc0434979b1e, the fix #7436. Prior to
that commit, the version of `$fmap` that was used was almost
identical to the one used in this patch! Why did that commit change
`$fmap` then? It was to avoid severe performance issues that would
arise for recursive `fmap` implementations, such as in the example
below:
```hs
data List a = Nil | Cons a (List a) deriving Functor
-- ===>
instance Functor List where
fmap f Nil = Nil
fmap f (Cons x xs) = Cons (f x) (fmap (\y -> f y) xs)
```
The fact that `\y -> f y` was eta expanded caused significant
performance overheads. Commit
49ca2a37bef18aa57235ff1dbbf1cc0434979b1e fixed this performance
issue, but it went too far. As a result, this patch partially
reverts 49ca2a37bef18aa57235ff1dbbf1cc0434979b1e.
To ensure that the performance issues pre-#7436 do not resurface,
I have taken some precautionary measures:
* I have added a special case to `$fmap` for situations where the
last type variable in an application of some type occurs directly.
If this special case fires, we avoid creating a lambda expression.
This ensures that we generate
`fmap f (Cons x xs) = Cons (f x) (fmap f xs)` in the derived
`Functor List` instance above. For more details, see
`Note [Avoid unnecessary eta expansion in derived fmap implementations]`
in `TcGenFunctor`.
* I have added a `T7436b` test case to ensure that the performance
of this derived `Functor List`-style code does not regress.
When implementing this, I discovered that `$replace`, the algorithm
which generates implementations of `(<$)`, has a special case that is
very similar to the `$fmap` special case described above. `$replace`
marked this special case with a custom `Replacer` data type, which
was a bit overkill. In order to use the same machinery for both
`Functor` methods, I ripped out `Replacer` and instead implemented
a simple way to detect the special case. See the updated commentary
in `Note [Deriving <$]` for more details.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f9db3e79bd0d70e5a1491174d540717f3bce2bf">1f9db3e7</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-03-12T09:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pretty-printer: Properly parenthesise LastStmt
After ApplicatveDo strips the last `return` during renaming, the pretty
printer has to restore it. However, if the return was followed by `$`,
the dollar was stripped too and not restored.
For example, the last stamement in:
```
foo = do
x <- ...
...
return $ f x
```
would be printed as:
```
return f x
```
This commit preserved the dolar, so it becomes:
```
return $ f x
```
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cb93af73499f9cee4a17427629840feb26171e5">5cb93af7</a></strong>
<div>
<span>by Kirill Elagin</span>
<i>at 2020-03-12T09:45:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">pretty-printer: Do not print ApplicativeDo join
* Do not print `join` in ApplictiveStmt, unless ppr-debug
* Print parens around multiple parallel binds
When ApplicativeDo is enabled, the renamer analyses the statements of a
`do` block and in certain cases marks them as needing to be rewritten
using `join`.
For example, if you have:
```
foo = do
a <- e1
b <- e2
doSomething a b
```
it will be desugared into:
```
foo = join (doSomething <$> e1 <*> e2)
```
After renaming but before desugaring the expression is stored
essentially as:
```
foo = do
[will need join] (a <- e1 | b <- e2)
[no return] doSomething a b
```
Before this change, the pretty printer would print a call to `join`,
even though it is not needed at this stage at all. The expression will be
actually rewritten into one using join only at desugaring, at which
point a literal call to join will be inserted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3a259092a02e84d6b45da6b232cfc022898451a0">3a259092</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-12T09:46:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expose compulsory unfoldings always
The unsafeCoerce# patch requires that unsafeCoerce# has
a compulsory unfolding that is always available. So we have
to be careful to expose compulsory unfoldings unconditionally
and consistently.
We didn't get this quite right: #17871. This patch fixes
it. No real surprises here.
See Note [Always expose compulsory unfoldings] in GHC.Iface.Tidy
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a65b8c2f5b4bc7abdb0ca3b5876df694acb8194">6a65b8c2</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-03-13T02:29:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: improve dependency tracking for the check-* programs
The code in Rules.Register responsible for finding all the build artifacts
that Cabal installs when registering a library (static/shared libs, .hi files,
...) was looking in the wrong place. This patch fixes that logic and makes sure
we gather all those artifacts in a list to declare that the rule for a given
`.conf` file, our proxy for "Hadrian, please install this package in the package
db for this stage", also produces those artifacts under the said package
database.
We also were completely missing some logic to declare that the check-* programs
have dependencies besides their source code, at least when testing an in-tree
compiler.
Finally, this patch also removes redundant packages from 'testsuitePackages',
since they should already be covered by the stage<N>Packages lists from
Settings.Default.
With this patch, after a complete build and freezing stage 1, a change to
`compiler/parser/Parser.y` results in rebuilding the ghc lib, reinstalling it,
and rebuilding the few programs that depend on it, _including_ `check-ppr` and
`check-api-annotations` (therefore fixing #17273).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/44fad4a925c06fa2b14611ea08acea9210ee4e00">44fad4a9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-13T02:30:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename isDllName
I wanted to fix the dangling comment in `isDllName` ("This is the cause
of #", #8696 is already mentioned earlier). I took the opportunity to
change the function name to better reflect what it does.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f292db8f10134919c420b71b8a5eccd379212ad">2f292db8</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-13T02:31:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update documentation for closureSize
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f124ff0dfccced755ee97ecac027119269996f8f">f124ff0d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-13T02:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Rework triggering of release builds
Use a push option instead of tagging.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f25557a6f240943ebe3eb3b3c7178e76a3e93e1">7f25557a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-13T10:38:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Distinguish integer-simple test envs
Previously two integer-simple jobs declared the same test environment. One (the nightly job) was built in the perf way, the other in the validate way. Consequently they had appreciably different performance characteristics, causing in the nightly job to spuriously fail with performance changes.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c12a2ec5fe4e7f94d565c0e6398d1d79854db146">c12a2ec5</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:25:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Lint
Ticket #17590 pointed out a bug in the way the linter dealt with
type lets, exposed by the new uniqAway story.
The fix is described in Note [Linting type lets]. I ended up
putting the in-scope Ids in a different env field, le_ids,
rather than (as before) sneaking them into the TCvSubst.
Surprisingly tiresome, but done.
Metric Decrease:
hie002
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b989845e378081f0932a7fec528e68daeeaa14fb">b989845e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:26:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix absolute buildroot support (#17822)
Shake's "**" wildcard doesn't match absolute root. We must use "//" instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f117135673b36816c343bc11efcbb8396160c75">4f117135</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:26:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make: refactor GMP rules
Document and use simpler rules for the ghc-gmp.h header.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7432b327a3c43c4e2e7c777b41a8e17899b8d0d1">7432b327</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-14T05:27:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use correct option name (-opti) (fix #17314)
s/pgmo/opti
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f7dd5710b80906ea7a3e15b7bb56a883a49fed8">8f7dd571</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-14T05:28:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow overriding LD_STAGE0 and AR_STAGE0 in the configure script.
Previously it was possible to override the stage0 C compiler via `CC_STAGE0`,
but you couldn't override `ld` or `ar` in stage0. This change allows overriding them
by setting `LD_STAGE0` or `AR_STAGE0`, respectively.
Our team uses this feature internally to take more control of our GHC build
and make it run more hermetically.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7c3e39a9a7ccb3b6c2953b0397a0d315dc0ec7d5">7c3e39a9</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-14T05:28:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use AC_ARG_VAR for LD_STAGE0 and AR_STAGE0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20d4d676964382b313b9e44062e45a7c38621999">20d4d676</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:28:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Don't traverse filled segment list in pause
The non-moving collector would previously walk the entire filled segment
list during the preparatory pause. However, this is far more work than
is strictly necessary. We can rather get away with merely collecting the
allocators' filled segment list heads and process the lists themselves
during the concurrent phase. This can significantly reduce the maximum
gen1 GC pause time in programs with high rates of long-lived allocations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fdfa2d0121ca8cc22479dd17a74afa58fc2b39f5">fdfa2d01</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:29:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Remove redundant bitmap clearing
nonmovingSweep already clears the bitmap in the sweep loop. There is no
reason to do so a second time.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2f8c77673f1faf0d8fed6df2bdd1ca15d696a010">2f8c7767</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:29:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simple refactor of cheapEqExpr
No change in functionality. Just seems tidier (and signficantly more
efficient) to deal with ticks directly than to call stripTicksTopE.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88f7a76208b0fcf41ca0e16d18a71523f0601ee5">88f7a762</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:29:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve CSE.combineAlts
This patch improves the way that CSE combines identical
alternatives. See #17901.
I'm still not happy about the duplication between CSE.combineAlts
and GHC.Core.Utils.combineIdenticalAlts; see the Notes with those
functions. But this patch is a step forward.
Metric Decrease:
T12425
T5642
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b95ddd3f20a67acf5251347d80f9cab191bdfc4">8b95ddd3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:30:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add integer-simple release build for Windows
Closes #16144.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e3c374cc5bd7eb49649b9f507f9f7740697e3f70">e3c374cc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wrap an implication around class-sig kind errors
Ticket #17841 showed that we can get a kind error
in a class signature, but lack an enclosing implication
that binds its skolems.
This patch
* Adds the wrapping implication: the new call to
checkTvConstraints in tcClassDecl1
* Simplifies the API to checkTvConstraints, which
was not otherwise called at all.
* Simplifies TcErrors.report_unsolved by *not*
initialising the TidyEnv from the typechecker lexical
envt. It's enough to do so from the free vars of the
unsolved constraints; and we get silly renamings if
we add variables twice: once from the lexical scope
and once from the implication constraint.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73133a3b601b76c46098fb8ad3c76de5fe04c9b2">73133a3b</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-14T05:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring in TcSMonad
This patch is just refactoring: no change in
behaviour.
I removed the rather complicated
checkConstraintsTcS
checkTvConstraintsTcS
in favour of simpler functions
emitImplicationTcS
emitTvImplicationTcS
pushLevelNoWorkList
The last of these is a little strange, but overall
it's much better I think.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/93c88c266eacd80a7f2a1754778167390c287b18">93c88c26</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-14T05:31:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Make `open` calls interruptible
As noted in #17912, `open` system calls were `safe` rather than
`interruptible`. Consequently, the program could not be interrupted with
SIGINT if stuck in a slow open operation. Fix this by marking
`c_safe_open` as interruptible.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bee4cdad4ce68a5bbe6af493d99f0197a34eef5c">bee4cdad</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-03-14T05:32:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove second tcLookupTcTyCon in tcDataDefn
Before this patch, tcDataDefn used to call tcLookupTcTyCon twice in a row:
1. in bindTyClTyVars itself
2. in the continuation passed to it
Now bindTyClTyVars passes the TcTyCon to the continuation, making
the second lookup unnecessary.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f116d35a5b028ae2bb22da5063900d2f3d0b476">3f116d35</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-03-14T19:34:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable stage1 build of haddock
The submodule has already been bumped to contain the fix.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49e9d7395a13584f15798bce1601b8d3a6633f11">49e9d739</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-14T19:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix printClosure when printing fwd ptrs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1de3ab4a147eeb0b34b24a3c0e91f174e6e5cb79">1de3ab4a</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-14T19:36:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused field var_inline (#17915)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d30aeb4b38381758025bc1002eb2135ad6bc58b8">d30aeb4b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-15T03:57:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document restriction on SCC pragma syntax
Currently, the names of cost centres must be quoted or
be lowercase identifiers.
Fixes #17916.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b4774598e6bd060b1b4230b11b734ca40022980d">b4774598</a></strong>
<div>
<span>by Brian Foley</span>
<i>at 2020-03-15T03:58:18-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove some dead code
>From the notes.ghc.drop list found using weeder in #17713
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd6ffe6be742cf3ec98406704fef53ad86cc1560">dd6ffe6b</a></strong>
<div>
<span>by Viktor Dukhovni</span>
<i>at 2020-03-15T03:58:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Note platform-specific Foreign.C.Types in context
Also fix the markup in the general note at the top of the module. Haddock
(usability trade-off), does not support multi-line emphasised text.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e82465fff5851f00449131fdc8bacd3ca95f90f">2e82465f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-15T10:57:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CmmToAsm (disentangle DynFlags)
This patch disentangles a bit more DynFlags from the native code
generator (CmmToAsm).
In more details:
- add a new NCGConfig datatype in GHC.CmmToAsm.Config which contains the
configuration of a native code generation session
- explicitly pass NCGConfig/Platform arguments when necessary
- as a consequence `sdocWithPlatform` is gone and there are only a few
`sdocWithDynFlags` left
- remove the use of `unsafeGlobalDynFlags` from GHC.CmmToAsm.CFG
- remove `sdocDebugLevel` (now we pass the debug level via NCGConfig)
There are still some places where DynFlags is used, especially because
of pretty-printing (CLabel), because of Cmm helpers (such as
`cmmExprType`) and because of `Outputable` instance for the
instructions. These are left for future refactoring as this patch is
already big.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c35c545d3f32f092c52052349f741739a844ec0f">c35c545d</a></strong>
<div>
<span>by Judah Jacobson</span>
<i>at 2020-03-15T10:57:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a -no-haddock flag.
This flag undoes the effect of a previous "-haddock" flag. Having both flags makes it easier
for build systems to enable Haddock parsing in a set of global flags, but then disable it locally for
specific targets (e.g., third-party packages whose comments don't pass the validation in the latest GHC).
I added the flag to expected-undocumented-flags.txt since `-haddock` was alreadyin that list.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cfcc3c9a1f2e4e33bed4c40767f8e7971e331c15">cfcc3c9a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-15T10:58:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix global_link of TSOs for threads reachable via dead weaks
Fixes #17785
Here's how the problem occurs:
- In generation 0 we have a TSO that is finished (i.e. it has no more
work to do or it is killed).
- The TSO only becomes reachable after collectDeadWeakPtrs().
- After collectDeadWeakPtrs() we switch to WeakDone phase where we don't
move TSOs to different lists anymore (like the next gen's thread list
or the resurrected_threads list).
- So the TSO will never be moved to a generation's thread list, but it
will be promoted to generation 1.
- Generation 1 collected via mark-compact, and because the TSO is
reachable it is marked, and its `global_link` field, which is bogus at
this point (because the TSO is not in a list), will be threaded.
- Chaos ensues.
In other words, when these conditions hold:
- A TSO is reachable only after collectDeadWeakPtrs()
- It's finished (what_next is ThreadComplete or ThreadKilled)
- It's retained by mark-compact collector (moving collector doesn't
evacuate the global_list field)
We end up doing random mutations on the heap because the TSO's
global_list field is not valid, but it still looks like a heap pointer
so we thread it during compacting GC.
The fix is simple: when we traverse old_threads lists to resurrect
unreachable threads the threads that won't be resurrected currently
stays on the old_threads lists. Those threads will never be visited
again by MarkWeak so we now reset the global_list fields. This way
compacting GC does not thread pointers to nowhere.
Testing
-------
The reproducer in #17785 is quite large and hard to build, because of
the dependencies, so I'm not adding a regression test.
In my testing the reproducer would take a less than 5 seconds to run,
and once in every ~5 runs would fail with a segfault or an assertion
error. In other cases it also fails with a test failure. Because the
tests never fail with the bug fix, assuming the code is correct, this
also means that this bug can sometimes lead to incorrect runtime
results.
After the fix I was able to run the reproducer repeatedly for about an
hour, with no runtime crashes or test failures.
To run the reproducer clone the git repo:
$ git clone https://github.com/osa1/streamly --branch ghc-segfault
Then clone primitive and atomic-primops from their git repos and point
to the clones in cabal.project.local. The project should then be
buildable using GHC HEAD. Run the executable `properties` with `+RTS -c
-DZ`.
In addition to the reproducer above I run the test suite using:
$ make slowtest EXTRA_HC_OPTS="-debug -with-rtsopts=-DS \
-with-rtsopts=-c +RTS -c -RTS" SKIPWAY='nonmoving nonmoving_thr'
This enables compacting GC always in both GHC when building the test
programs and when running the test programs, and also enables sanity
checking when running the test programs. These set of flags are not
compatible for all tests so there are some failures, but I got the same
set of failures with this patch compared to GHC HEAD.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/818b3c38e7548f4720815f76969238d82c9650f7">818b3c38</a></strong>
<div>
<span>by Lysxia</span>
<i>at 2020-03-16T23:52:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: add strict IO functions: readFile', getContents', hGetContents'
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18a346a4b5a02b8c62e8eedb91b35c2d8e754b96">18a346a4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-16T23:53:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core (#13009)
Update submodule: haddock
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92327e3afd9d2650c9cc9610297d40c2712da085">92327e3a</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-16T23:54:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update sanity checking for TSOs:
- Remove an invalid assumption about GC checking what_next field. The GC
doesn't care about what_next at all, if a TSO is reachable then all
its pointers are followed (other than global_tso, which is only
followed by compacting GC).
- Remove checkSTACK in checkTSO: TSO stacks will be visited in
checkHeapChain, or checkLargeObjects etc.
- Add an assertion in checkTSO to check that the global_link field is
sane.
- Did some refactor to remove forward decls in checkGlobalTSOList and
added braces around single-statement if statements.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e1aa40525ddac370766907a49682976e2ea78422">e1aa4052</a></strong>
<div>
<span>by PHO</span>
<i>at 2020-03-17T07:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use non-portable operator "==" in configure.ac
The test operator "==" is a Bash extension and produces a wrong result
if /bin/sh is not Bash.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89f034ddeb4ad7d93c877d5bdbcf2cca7a44f79c">89f034dd</a></strong>
<div>
<span>by Maximilian Tagher</span>
<i>at 2020-03-17T07:36:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document the units of -ddump-timings
Right now, in the output of -ddump-timings to a file, you can't tell what the units are:
```
CodeGen [TemplateTestImports]: alloc=22454880 time=14.597
```
I believe bytes/milliseconds are the correct units, but confirmation would be appreciated. I'm basing it off of this snippet from `withTiming'`:
```
when (verbosity dflags >= 2 && prtimings == PrintTimings)
$ liftIO $ logInfo dflags (defaultUserStyle dflags)
(text "!!!" <+> what <> colon <+> text "finished in"
<+> doublePrec 2 time
<+> text "milliseconds"
<> comma
<+> text "allocated"
<+> doublePrec 3 (realToFrac alloc / 1024 / 1024)
<+> text "megabytes")
```
which implies time is in milliseconds, and allocations in bytes (which divided by 1024 would be KB, and again would be MB)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/beffa14771ebd6ba24b20337f29045364621c5fa">beffa147</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-17T07:37:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement mapTyCo like foldTyCo
This patch makes mapType use the successful idiom described
in TyCoRep
Note [Specialising foldType]
I have not yet changed any functions to use mapType, though there
may be some suitable candidates.
This patch should be a no-op in terms of functionality but,
because it inlines the mapper itself, I'm hoping that there may
be some modest perf improvements.
Metric Decrease:
T5631
T5642
T3064
T9020
T14683
hie002
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5800ebfeb2fe3e3ed985cdf08a66defea73db71d">5800ebfe</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-17T07:38:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't update ModDetails with CafInfos when opts are disabled
This is consistent with the interface file behavior where we omit
HsNoCafRefs annotations with -fomit-interface-pragmas (implied by -O0).
ModDetails and ModIface are just different representations of the same
thing, so they really need to be in sync. This patch does the right
thing and does not need too much explanation, but here's an example of a
problem not doing this causes in !2842:
-- MyInteger.hs
module MyInteger
( MyInteger (MyInteger)
, ToMyInteger (toMyInteger)
) where
newtype MyInteger = MyInteger Integer
class ToMyInteger a where
toMyInteger :: a -> MyInteger
instance ToMyInteger Integer where
toMyInteger = MyInteger {- . succ -}
-- Main.hs
module Main
( main
) where
import MyInteger (MyInteger (MyInteger), toMyInteger)
main :: IO ()
main = do
let (MyInteger i) = (id . toMyInteger) (41 :: Integer)
print i
If I build this with -O0, without this fix, we generate a ModDetails with
accurate LFInfo for toMyInteger (MyInteger.$fToMyIntegerInteger) which says that
it's a LFReEntrant with arity 1. This means in the use site (Main) we tag the
value:
R3 = MyInteger.$fToMyIntegerInteger_closure + 1;
R2 = GHC.Base.id_closure;
R1 = GHC.Base.._closure;
Sp = Sp - 16;
call stg_ap_ppp_fast(R4, R3, R2, R1) args: 24, res: 0, upd: 24;
Now we change the definition by uncommenting the `succ` part and it becomes a thunk:
MyInteger.$fToMyIntegerInteger [InlPrag=INLINE (sat-args=0)]
:: MyInteger.ToMyInteger GHC.Integer.Type.Integer
[GblId[DFunId(nt)]] =
{} \u [] $ctoMyInteger_rEA;
and its LFInfo is now LFThunk. This change in LFInfo makes a difference in the
use site: we can no longer tag it.
But becuase the interface fingerprint does not change (because ModIface does not
change) we don't rebuild Main and tag the thunk.
(1.2% increase in allocations when building T12545 on armv7 because we
generate more code without CafInfos)
Metric Increase:
T12545
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b632dad2e1d373606fe29f7eee0daf15641560f">5b632dad</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example for Data.Semigroup.diff
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4d85d68b004a3d577c0e27d9e6fdddd118e8a9f3">4d85d68b</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75168d07c9c30289709423fc184bbab8dcad0f4e">75168d07</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-17T07:38:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make example collapsible
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/53ff2cd0c49735e8f709ac8a5ceab68483eb89df">53ff2cd0</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-17T13:46:57+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #17021 by checking more return kinds
All the details are in new Note [Datatype return kinds] in
TcTyClsDecls.
Test case: typecheck/should_fail/T17021{,b}
typecheck/should_compile/T17021a
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/528df8ecb4e2f9c78b1ae4ab7ff8230644e9b643">528df8ec</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-18T10:06:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Core operations (#13009)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e8a71c1138b587dfbab8a1823b3f7fa6f0166bd">4e8a71c1</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-18T10:07:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release note about fix to #16502.
We thought we needed to update the manual, but the fix for #16502
actually brings the implementation in line with the manual. So we
just alert users of how to update their code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5cbf9934c59f7726781cc4cccf4748a5c09c4997">5cbf9934</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-19T00:39:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update "GHC differences to the FFI Chapter" in user guide.
The old entry had a heavy focus on how things had been. Which is
not what I generally look for in a user guide.
I also added a small section on behaviour of nested safe ffi calls.
[skip-ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b03fd3bcd4ff14aed2942275c3b0db5392dc913c">b03fd3bc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-19T00:40:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Use ConLikeSet to model negative info
In #17911, Simon recognised many warnings stemming from over-long list
unions while coverage checking Cabal's `LicenseId` module.
This patch introduces a new `PmAltConSet` type which uses a `UniqDSet`
instead of an association list for `ConLike`s. For `PmLit`s, it will
still use an assocation list, though, because a similar map data
structure would entail a lot of busy work.
Fixes #17911.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64f207566931469648e791df4f0f0384d45cddd0">64f20756</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-19T12:16:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring: use Platform instead of DynFlags when possible
Metric Decrease:
ManyConstructors
T12707
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cb1785d9f839e34a3a4892f354f0c51cc6553c0e">cb1785d9</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-19T12:16:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FastString: fix eager reading of string ptr in hashStr
This read causes NULL dereferencing when len is 0.
Fixes #17909
In the reproducer in #17909 this bug is triggered as follows:
- SimplOpt.dealWithStringLiteral is called with a single-char string
("=" in #17909)
- tailFS gets called on the FastString of the single-char string.
- tailFS checks the length of the string, which is 1, and calls
mkFastStringByteString on the tail of the ByteString, which is an
empty ByteString as the original ByteString has only one char.
- ByteString's unsafeUseAsCStringLen returns (NULL, 0) for the empty
ByteString, which is passed to mkFastStringWith.
- mkFastStringWith gets hash of the NULL pointer via hashStr, which
fails on empty strings because of this bug.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73a7383ebc17f495d7acd04007c8c56b46532cb6">73a7383e</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-20T20:42:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify treatment of heterogeneous equality
Previously, if we had a [W] (a :: k1) ~ (rhs :: k2), we would
spit out a [D] k1 ~ k2 and part the W as irreducible, hoping for
a unification. But we needn't do this. Instead, we now spit out
a [W] co :: k2 ~ k1 and then use co to cast the rhs of the original
Wanted. This means that we retain the connection between the
spat-out constraint and the original.
The problem with this new approach is that we cannot use the
casted equality for substitution; it's too like wanteds-rewriting-
wanteds. So, we forbid CTyEqCans that mention coercion holes.
All the details are in Note [Equalities with incompatible kinds]
in TcCanonical.
There are a few knock-on effects, documented where they occur.
While debugging an error in this patch, Simon and I ran into
infelicities in how patterns and matches are printed; we made
small improvements.
This patch includes mitigations for #17828, which causes spurious
pattern-match warnings. When #17828 is fixed, these lines should
be removed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/faa36e5b3674a7b2cfc6b931eec27b3558fad33b">faa36e5b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-20T20:43:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: ignore in-tree GMP objects with ``--lint``
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9a96ff6b1c19c9d0af9c9a39fb2c086f311c7239">9a96ff6b</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-03-20T20:44:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update core spec to reflect changes to Core.
Key changes:
* Adds a new rule for forall-coercions over coercion variables, which
was implemented but conspicuously missing from the spec.
* Adds treatment for FunCo.
* Adds treatment for ForAllTy over coercion variables.
* Improves commentary (including restoring a Note lost in
03d4852658e1b7407abb4da84b1b03bfa6f6db3b) in the source.
No changes to running code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e0451c6ce78b08b5f7564aa03a9a86051b35163">7e0451c6</a></strong>
<div>
<span>by Sergej Jaskiewicz</span>
<i>at 2020-03-20T20:44:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix event message in withTiming'
This typo caused generating 'end' events without the corresponding 'begin' events.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1542a626a3649e5fc1becec1eff2715a6108d144">1542a626</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fs.h: Add missing declarations on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bcf2ccdd0bdd3cf176943ddb946e4fcef2ac7c1">3bcf2ccd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump process submodule
Avoids redundant case alternative warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3b363ef9405c52369b63fc167ded8a533c6a5079">3b363ef9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Normalize slashes in ghc-api annotations output
Enable `normalise_slashes` on `annotations`, `listcomps`, and
`parseTree` to fix Windows failures.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/25fc94295c68620c6928751aaadc46b11a185f0c">25fc9429</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7f58ec6d94f49cf5713757710c6b80a682ee066b">7f58ec6d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix TOP of T17786
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aadcd909563d5ddf7b2fc469ee3c09c301b1a813">aadcd909</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Update expected output on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc1eb10dae03f3fe5f11de845c6772c229684c28">dc1eb10d</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix executable extension passed to testsuite driver
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58f62e2caa19e13082807da1d49f94e9cf869322">58f62e2c</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Require that Windows-hadrian job passes
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8dd2415dd2f423688f33a8fb267857e3ff39754d">8dd2415d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Eliminate redundant .exe from GHC path
Previously we were invoking:
bash -c
"c:/GitLabRunner/builds/eEQrxK4p/0/ghc/ghc/toolchain/bin/ghc.exe.exe
testsuite/mk/ghc-config.hs -o _build/test/bin/ghc-config.exe"
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/373621f61f812accdeba39c745eb7d015430ff8e">373621f6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-22T22:37:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/abc02b4036c2d8efe50b720d8c8103c4f1b8899a">abc02b40</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-03-22T22:38:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Annotate the non-total function in Data.Foldable as such
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19f125578247dfe8036b5793cb3f6b684474f9c7">19f12557</a></strong>
<div>
<span>by Josef Svenningsson</span>
<i>at 2020-03-23T14:05:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix ApplicativeDo regression #17835
A previous fix for #15344 made sure that monadic 'fail' is used properly
when translating ApplicativeDo. However, it didn't properly account
for when a 'fail' will be inserted which resulted in some programs
failing with a type error.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2643ba465cd2a133b6f495f34fc59cd1a6d23525">2643ba46</a></strong>
<div>
<span>by Paavo</span>
<i>at 2020-03-24T08:31:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add example and doc for Arg (Fixes #17153)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/703221f408b023a1b3433938572e7b5c24b4af60">703221f4</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-03-25T14:45:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use export list of Main module in function TcRnDriver.hs:check_main (Fix #16453)
- Provide the export list of the `Main` module as parameter to the
`compiler/typecheck/TcRnDriver.hs:check_main` function.
- Instead of `lookupOccRn_maybe` call the function `lookupInfoOccRn`.
It returns the list `mains_all` of all the main functions in scope.
- Select from this list `mains_all` all `main` functions that are in
the export list of the `Main` module.
- If this new list contains exactly one single `main` function, then
typechecking continues.
- Otherwise issue an appropriate error message.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3e27205a66b06a4501d87eb31e285eadbc693eb7">3e27205a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-03-25T14:45:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove -fkill-absence and -fkill-one-shot flags
They seem to be a benchmarking vestige of the Cardinality paper and
probably shouldn't have been merged to HEAD in the first place.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/262e42aa34c4d5705c8d011907c351497dd4e862">262e42aa</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-03-25T22:41:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do not panic on linker errors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0de03cd78729dc58a846c64b645e71057ec5d24e">0de03cd7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-25T22:42:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags refactoring III
Use Platform instead of DynFlags when possible:
* `tARGET_MIN_INT` et al. replaced with `platformMinInt` et al.
* no more DynFlags in PreRules: added a new `RuleOpts` datatype
* don't use `wORD_SIZE` in the compiler
* make `wordAlignment` use `Platform`
* make `dOUBLE_SIZE` a constant
Metric Decrease:
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a04920b23376b2759b5049820400ddd40f7b89e">7a04920b</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: fix a typo in liftA doc
This change removes an extra '|' that should not be rendered in
the liftA documentation.
Tracking: #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c5a15f7d257d0a2ded4850e38b6174965a7735b">1c5a15f7</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: add Control.Applicative optional example
This change adds an optional example.
Tracking: #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6d172e63f3dd3590b0a57371efb8f924f1fcdf05">6d172e63</a></strong>
<div>
<span>by Tristan Cacqueray</span>
<i>at 2020-03-25T22:42:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Base: add markup around Except
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb2162c81964b3a1057c21c73574cc2b542d863a">eb2162c8</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-03-26T12:37:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `ghciTablesNextToCode` from compiler proper
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f51efc4bf5f20d1df3d11a2bb4c147f416367ae4">f51efc4b</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2020-03-26T12:37:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Prepare to use run-time tablesNextToCode in compiler exclusively
Factor out CPP as much as possible to prepare for runtime
determinattion.
Progress towards #15548
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c446220250dcada51d4bb33a0cc7d8ce572e8b6">1c446220</a></strong>
<div>
<span>by Joachim Breitner</span>
<i>at 2020-03-26T12:37:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use run-time tablesNextToCode in compiler exclusively (#15548)
Summary:
- There is no more use of the TABLES_NEXT_TO_CODE CPP macro in
`compiler/`. GHCI_TABLES_NEXT_TO_CODE is also removed entirely.
The field within `PlatformMisc` within `DynFlags` is used instead.
- The field is still not exposed as a CLI flag. We might consider some
way to ensure the right RTS / libraries are used before doing that.
Original reviewers:
Original subscribers: TerrorJack, rwbarton, carter
Original Differential Revision: https://phabricator.haskell.org/D5082
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1941ef4f050c0dfcb68229641fcbbde3a10f1072">1941ef4f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Types (#13009)
Update Haddock submodule
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1c7c6f1afc8e7f7ba5d256780bc9d5bb5f3e7601">1c7c6f1a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GHC.Types.Unique.Map module
This module isn't used anywhere in GHC.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1a6c73d01912b389e012a0af81a5c2002e82636">f1a6c73d</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:28:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Merge GHC.Types.CostCentre.Init into GHC.Driver.CodeOutput
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54250f2d8de910b094070c1b48f086030df634b1">54250f2d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-03-29T17:29:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Demand analysis: simplify the demand for a RHS
Ticket #17932 showed that we were using a stupid demand for the RHS
of a let-binding, when the result is a product. This was the result
of a "fix" in 2013, which (happily) turns out to no longer be
necessary.
So I just deleted the code, which simplifies the demand analyser,
and fixes #17932. That in turn uncovered that the anticipation
of worker/wrapper in CPR analysis was inaccurate, hence the logic
that decides whether to unbox an argument in WW was extracted into
a function `wantToUnbox`, now consulted by CPR analysis.
I tried nofib, and got 0.0% perf changes.
All this came up when messing about with !2873 (ticket #17917),
but is idependent of it.
Unfortunately, this patch regresses #4267 and realised that it is now
blocked on #16335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/03060b2f963436dd22582f3a1c218b7a74d302ec">03060b2f</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T17786 on Windows
Fixes line ending normalization issue.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1f7995baaaf4dcba9b3abaddcd571ac66675ab19">1f7995ba</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix T17786
Fix missing quoting and expected exit code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef9c608eba417c59fe45c9edd6a946c59f50b5d2">ef9c608e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:30:05-04:00</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/e54500c12de051cb9695728d27c812e5160593ee">e54500c1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-29T17:30:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Store ComponentId details
As far as GHC is concerned, installed package components ("units") are
identified by an opaque ComponentId string provided by Cabal. But we
don't want to display it to users (as it contains a hash) so GHC queries
the database to retrieve some infos about the original source package
(name, version, component name).
This patch caches these infos in the ComponentId itself so that we don't
need to provide DynFlags (which contains installed package informations)
to print a ComponentId.
In the future we want GHC to support several independent package states
(e.g. for plugins and for target code), hence we need to avoid
implicitly querying a single global package state.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e7cb714173652165b8372c3450f4ccd6a377497">7e7cb714</a></strong>
<div>
<span>by Marius Bakke</span>
<i>at 2020-03-29T17:31:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Remove test that dlopens a PIE object.
glibc 2.30 disallowed dlopening PIE objects, so just remove the test.
Fixes #17952.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c8f80d8876965539571d37d3c7f0fee43c300d2">6c8f80d8</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-29T17:32:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Correct haddocks for testBit in Data.Bits
It conflated the nth bit with the bit at offset n.
Now we instead give the definition in terms of `bit and `.&.`
on top of clearer phrasing.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c916f190b455d9c43459f81c7ee06d06ab3db957">c916f190</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-29T17:32:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Bits.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64bf7f51064dad9c63728ac8bccdb9cf00bdb420">64bf7f51</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-29T17:32:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Add FreeBSD release job
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a0d8e92e9c9b67426aa139d6bc46363d8940f992">a0d8e92e</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-29T17:33:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Run checkNewDataCon before constraint-solving newtype constructors
Within `checkValidDataCon`, we used to run `checkValidType` on the
argument types of a newtype constructor before running
`checkNewDataCon`, which ensures that the user does not attempt
non-sensical things such as newtypes with multiple arguments or
constraints. This works out in most situations, but this falls over
on a corner case revealed in #17955:
```hs
newtype T = Coercible () T => T ()
```
`checkValidType`, among other things, peforms an ambiguity check on
the context of a data constructor, and that it turn invokes the
constraint solver. It turns out that there is a special case in the
constraint solver for representational equalities (read: `Coercible`
constraints) that causes newtypes to be unwrapped (see
`Note [Unwrap newtypes first]` in `TcCanonical`). This special case
does not know how to cope with an ill formed newtype like `T`, so
it ends up panicking.
The solution is surprisingly simple: just invoke `checkNewDataCon`
before `checkValidType` to ensure that the illicit newtype
constructor context is detected before the constraint solver can
run amok with it.
Fixes #17955.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/45eb9d8cad254440eaea25676d6788ca13baa2fb">45eb9d8c</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-03-29T17:33:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Minor cleanup
- Simplify mkBuildExpr, the function newTyVars was called
only on a one-element list.
- TTG: use noExtCon in more places. This is more future-proof.
- In zonkExpr, panic instead of printing a warning.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f024b6e385bd1448968b7bf20de05f655c815bae">f024b6e3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-03-30T12:48:39+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Expect T4267 to pass
Since 54250f2d8de910b094070c1b48f086030df634b1 we expected T4267 to
fail, but it passes on CI.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/57b888c0e90be7189285a6b078c30b26d0923809">57b888c0</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Require GHC 8.8 as the minimum compiler for bootstrapping
This allows us to remove several bits of CPP that are either always
true or no longer reachable. As an added bonus, we no longer need to
worry about importing `Control.Monad.Fail.fail` qualified to avoid
clashing with `Control.Monad.fail`, since the latter is now the same
as the former.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/33f095511a8fce4c945bbcd4feb3910c854dcb61">33f09551</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-03-31T10:54:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #17963
The panic in #17963 happened to be fixed by commit
e3c374cc5bd7eb49649b9f507f9f7740697e3f70. This patch adds a
regression test to ensure that it remains fixed.
Fixes #17963.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09a36e80ecaefcfb60eccda98bd06461d0aeca70">09a36e80</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-03-31T10:55:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify stderrSupportsAnsiColors
The combinator andM is used only once, and the code is shorter and
simpler if you inline it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95bccdd034ce4dd2d1bc36db9f1ba5e172550249">95bccdd0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-31T10:56:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Ensure that encoding global variables aren't inlined
As noted in #17970, these (e.g. `getFileSystemEncoding` and
`setFileSystemEncoding`) previously had unfoldings, which would
break their global-ness.
While not strictly necessary, I also add a NOINLINE on
`initLocaleEncoding` since it is used in `System.IO`, ensuring that we
only system's query the locale encoding once.
Fixes #17970.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/982aaa837aed564ae9b418cda8e97d4facff8fb8">982aaa83</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-03-31T10:56:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update hadrian index revision.
Required in order to build hadrian using ghc-8.10
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b9c586472bf99425f7bbcf346472d7c54f05028">4b9c5864</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-03-31T10:57:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">integer-gmp: Bump version and add changelog entry
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b39f2e6f63ae50cedd96eaf49146de8ed00fbc8">9b39f2e6</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-01T01:20:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up "Eta reduction for data families" Notes
Before, there were two distinct Notes named
"Eta reduction for data families". This renames one of them to
"Implementing eta reduction for data families" to disambiguate the
two and fixes references in other parts of the codebase to ensure
that they are pointing to the right place.
Fixes #17313.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7627eab5dd882eb6f1567e3ae95c6c770830a5eb">7627eab5</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-01T01:20:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix the changelog/@since information for hGetContents'/getContents'/readFile'
Fixes #17979.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0002db1bf436cbd32f97b659a52b1eee4e8b21db">0002db1b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-01T01:21:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill wORDS_BIGENDIAN and replace it with platformByteOrder (#17957)
Metric Decrease:
T13035
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b21717907a741b56513f5e1fa1ebceecf971613">7b217179</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-01T15:03:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Adjust recursion depth for inhabitation test
In #17977, we ran into the reduction depth limit of the typechecker.
That was only a symptom of a much broader issue: The recursion depth
of the coverage checker for trying to instantiate strict fields in the
`nonVoid` test was far too high (100, the `defaultMaxTcBound`).
As a result, we were performing quite poorly on `T17977`.
Short of a proper termination analysis to prove emptyness of a type,
we just arbitrarily default to a much lower recursion limit of 3.
Fixes #17977.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c09f636a459f50119bfbb5bf798b9a9e19eb464">3c09f636</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-01T15:03:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make hadrian pass on the no-colour setting to GHC.
Fixes #17983.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b943b25d0786da64031ac63ddf9b4574182057bb">b943b25d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-02T01:45:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-engineer the binder-swap transformation
The binder-swap transformation is implemented by the occurrence
analyser -- see Note [Binder swap] in OccurAnal. However it had
a very nasty corner in it, for the case where the case scrutinee
was a GlobalId. This led to trouble and hacks, and ultimately
to #16296.
This patch re-engineers how the occurrence analyser implements
the binder-swap, by actually carrying out a substitution rather
than by adding a let-binding. It's all described in
Note [The binder-swap substitution].
I did a few other things along the way
* Fix a bug in StgCse, which could allow a loop breaker to be CSE'd
away. See Note [Care with loop breakers] in StgCse. I think it can
only show up if occurrence analyser sets up bad loop breakers, but
still.
* Better commenting in SimplUtils.prepareAlts
* A little refactoring in CoreUnfold; nothing significant
e.g. rename CoreUnfold.mkTopUnfolding to mkFinalUnfolding
* Renamed CoreSyn.isFragileUnfolding to hasCoreUnfolding
* Move mkRuleInfo to CoreFVs
We observed respectively 4.6% and 5.9% allocation decreases for the following
tests:
Metric Decrease:
T9961
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/42d68364f66846969edf029f878875c10cdfe0b2">42d68364</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-02T01:46:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve precise exceptions in strictness analysis
Fix #13380 and #17676 by
1. Changing `raiseIO#` to have `topDiv` instead of `botDiv`
2. Give it special treatment in `Simplifier.Util.mkArgInfo`, treating it
as if it still had `botDiv`, to recover dead code elimination.
This is the first commit of the plan outlined in
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/2525#note_260886.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a88dd11594b8d8fd20500d026e657a5f99dfdd2">0a88dd11</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-02T01:47:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a pointer format string in RTS
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5beac042b995b055a66bc16be536d9e920f6864d">5beac042</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-02T01:48:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused closure stg_IND_direct
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88f38b03025386f0f1e8f5861eed67d80495168a">88f38b03</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-02T01:48:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Session: Memoize stderrSupportsAnsiColors
Not only is this a reasonable efficiency measure but it avoids making
reentrant calls into ncurses, which is not thread-safe. See #17922.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27740f24cb70fc14b00c1212c06642a144a6117d">27740f24</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:49:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Hadrian build with Cabal-3.2
GHC 8.10 ships with `Cabal-3.2.0.0`, so it would be convenient to
make Hadrian supporting building against 3.2.* instead of having to
rebuild the entirety of `Cabal-3.0.0.0`. There is one API change in
`Cabal-3.2.*` that affects Hadrian: the `synopsis` and `description`
functions now return `ShortText` instead of `String`. Since Hadrian
manipulates these `String`s in various places, I found that the
simplest fix was to use CPP to convert `ShortText` to `String`s
where appropriate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4980200255dabf59ae537f10c55d19ef1a00bbdd">49802002</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-02T01:50:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Stack resolver for hadrian/build-stack
Broken by 57b888c0e90be7189285a6b078c30b26d0923809
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30a63e79c65b023497af4fe2347149382c71829d">30a63e79</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-02T01:50:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two ASSERT buglets in reifyDataCon
Two `ASSERT`s in `reifyDataCon` were always using `arg_tys`, but
`arg_tys` is not meaningful for GADT constructors. In fact, it's
worse than non-meaningful, since using `arg_tys` when reifying a
GADT constructor can lead to failed `ASSERT`ions, as #17305
demonstrates.
This patch applies the simplest possible fix to the immediate
problem. The `ASSERT`s now use `r_arg_tys` instead of `arg_tys`, as
the former makes sure to give something meaningful for GADT
constructors. This makes the panic go away at the very least. There
is still an underlying issue with the way the internals of
`reifyDataCon` work, as described in
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227023, but we
leave that as future work, since fixing the underlying issue is
much trickier (see
https://gitlab.haskell.org/ghc/ghc/issues/17305#note_227087).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef7576c40f8de391ed8b1c81c38156202e6d17cf">ef7576c4</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-04-03T06:24:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add outputable instances for the types in GHC.Iface.Ext.Types, add -ddump-hie
flag to dump pretty printed contents of the .hie file
Metric Increase:
hie002
Because of the regression on i386:
compile_time/bytes allocated increased from i386-linux-deb9 baseline @ HEAD~10:
Expected hie002 (normal) compile_time/bytes allocated: 583014888.0 +/-10%
Lower bound hie002 (normal) compile_time/bytes allocated: 524713399
Upper bound hie002 (normal) compile_time/bytes allocated: 641316377
Actual hie002 (normal) compile_time/bytes allocated: 877986292
Deviation hie002 (normal) compile_time/bytes allocated: 50.6 %
*** unexpected stat test failure for hie002(normal)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9462452a4843a2c42fe055a0a7e274d5164d1dc0">9462452a</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-03T06:25:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve and refactor StgToCmm codegen for DataCons.
We now differentiate three cases of constructor bindings:
1)Bindings which we can "replace" with a reference to
an existing closure. Reference the replacement closure
when accessing the binding.
2)Bindings which we can "replace" as above. But we still
generate a closure which will be referenced by modules
importing this binding.
3)For any other binding generate a closure. Then reference
it.
Before this patch 1) did only apply to local bindings and we
didn't do 2) at all.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a214d2142c1bafa71fe52cb3823351ff9322d336">a214d214</a></strong>
<div>
<span>by Moritz Bruder</span>
<i>at 2020-04-03T06:26:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add singleton to NonEmpty in libraries/base
This adds a definition to construct a singleton non-empty list
(Data.List.NonEmpty) according to issue #17851.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7597aa0c028ced898ac97e344754dd961b70c57">f7597aa0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: measure compiler stats for T16190
We were mistakenly measuring program stats
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a485c3c4049fff09e989bfd7d2ba47035c92a69b">a485c3c4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move blob handling into StgToCmm
Move handling of big literal strings from CmmToAsm to StgToCmm. It
avoids the use of `sdocWithDynFlags` (cf #10143). We might need to move
this handling even higher in the pipeline in the future (cf #17960):
this patch will make it easier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cc2918a0407e1581e824ebd90a1fcbb0637d5744">cc2918a0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-03T06:26:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor CmmStatics
In !2959 we noticed that there was some redundant code (in GHC.Cmm.Utils
and GHC.Cmm.StgToCmm.Utils) used to deal with `CmmStatics` datatype
(before SRT generation) and `RawCmmStatics` datatype (after SRT
generation).
This patch removes this redundant code by using a single GADT for
(Raw)CmmStatics.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e60273db47364fc08aeb5a389caf67559e0d353">9e60273d</a></strong>
<div>
<span>by Maxim Koltsov</span>
<i>at 2020-04-03T06:27:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix haddock formatting in Control.Monad.ST.Lazy.Imp.hs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b7e8a94cb3334fc0e513dec2db323f32c3a0713">1b7e8a94</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-03T06:28:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Turn newlines into spaces for hadrian/ghci.
The newlines break the command on windows.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4291bddaea3148908c55f235ee8978e1d9aa6f20">4291bdda</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-03T06:28:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Major improvements to the specialiser
This patch is joint work of Alexis King and Simon PJ. It does some
significant refactoring of the type-class specialiser. Main highlights:
* We can specialise functions with types like
f :: Eq a => a -> Ord b => b => blah
where the classes aren't all at the front (#16473). Here we can
correctly specialise 'f' based on a call like
f @Int @Bool dEqInt x dOrdBool
This change really happened in an earlier patch
commit 2d0cf6252957b8980d89481ecd0b79891da4b14b
Author: Sandy Maguire <sandy@sandymaguire.me>
Date: Thu May 16 12:12:10 2019 -0400
work that this new patch builds directly on that work, and refactors
it a bit.
* We can specialise functions with implicit parameters (#17930)
g :: (?foo :: Bool, Show a) => a -> String
Previously we could not, but now they behave just like a non-class
argument as in 'f' above.
* We can specialise under-saturated calls, where some (but not all of
the dictionary arguments are provided (#17966). For example, we can
specialise the above 'f' based on a call
map (f @Int dEqInt) xs
even though we don't (and can't) give Ord dictionary.
This may sound exotic, but #17966 is a program from the wild, and
showed significant perf loss for functions like f, if you need
saturation of all dictionaries.
* We fix a buglet in which a floated dictionary had a bogus demand
(#17810), by using zapIdDemandInfo in the NonRec case of specBind.
* A tiny side benefit: we can drop dead arguments to specialised
functions; see Note [Drop dead args from specialisations]
* Fixed a bug in deciding what dictionaries are "interesting"; see
Note [Keep the old dictionaries interesting]
This is all achieved by by building on Sandy Macguire's work in
defining SpecArg, which mkCallUDs uses to describe the arguments of
the call. Main changes:
* Main work is in specHeader, which marched down the [InBndr] from the
function definition and the [SpecArg] from the call site, together.
* specCalls no longer has an arity check; the entire mechanism now
handles unders-saturated calls fine.
* mkCallUDs decides on an argument-by-argument basis whether to
specialise a particular dictionary argument; this is new.
See mk_spec_arg in mkCallUDs.
It looks as if there are many more lines of code, but I think that
all the extra lines are comments!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40a85563a46c682eaab5fdf970f7c46afca78cb3">40a85563</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-03T18:26:19+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert accidental change in 9462452
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bd75e5da0f1f05f107325733b570bf28b379d2f2">bd75e5da</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-04T07:07:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable ImpredicativeTypes internally when typechecking selector bindings
This is necessary for certain record selectors with higher-rank
types, such as the examples in #18005. See
`Note [Impredicative record selectors]` in `TcTyDecls`.
Fixes #18005.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcfe29c8520244764146c7a5f336be1f9700db6c">dcfe29c8</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-06T13:16:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't override proc CafInfos in ticky builds
Fixes #17947
When we have a ticky label for a proc, IdLabels for the ticky counter
and proc entry share the same Name. This caused overriding proc CafInfos
with the ticky CafInfos (i.e. NoCafRefs) during SRT analysis.
We now ignore the ticky labels when building SRTMaps. This makes sense
because:
- When building the current module they don't need to be in SRTMaps as
they're initialized as non-CAFFY (see mkRednCountsLabel), so they
don't take part in the dependency analysis and they're never added to
SRTs.
(Reminder: a "dependency" in the SRT analysis is a CAFFY dependency,
non-CAFFY uses are not considered as dependencies for the algorithm)
- They don't appear in the interfaces as they're not exported, so it
doesn't matter for cross-module concerns whether they're in the SRTMap
or not.
See also the new Note [Ticky labels in SRT analysis].
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cec2c71fe91c88649628c6e83416533b816b86a5">cec2c71f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-06T13:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix an tricky specialiser loop
Issue #17151 was a very tricky example of a bug in which the
specialiser accidentally constructs a recurive dictionary,
so that everything turns into bottom.
I have fixed variants of this bug at least twice before:
see Note [Avoiding loops]. It was a bit of a struggle
to isolate the problem, greatly aided by the work that
Alexey Kuleshevich did in distilling a test case.
Once I'd understood the problem, it was not difficult to fix,
though it did lead me a bit of refactoring in specImports.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e850d14ffbeea39ad386b1e888cd97375758d6d6">e850d14f</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-06T13:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring only
This refactors DictBinds into a data type rather than a pair.
No change in behaviour, just better code
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f38e8d61f066c3064c600c352eebcd87f28d989a">f38e8d61</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-07T02:00:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ProfHeap: Fix memory leak when not compiled with profiling
If we're doing heap profiling on an unprofiled executable we keep
allocating new space in initEra via nextEra on each profiler run but we
don't have a corresponding freeEra call.
We do free the last era in endHeapProfiling but previous eras will have
been overwritten by initEra and will never get free()ed.
Metric Decrease:
space_leak_001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcd668593e1c9e00c5d9c72960b4833dd526cb9a">bcd66859</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-07T02:00:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Re-export GHC.Magic.noinline from base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d2991f8b4c1b686323b2c9452ce845a60b8d94c">3d2991f8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-07T18:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">simplifier: Kill off ufKeenessFactor
We used to have another factor, ufKeenessFactor, which would scale the
discounts before they were subtracted from the size. This was justified
with the following comment:
-- We multiple the raw discounts (args_discount and result_discount)
-- ty opt_UnfoldingKeenessFactor because the former have to do with
-- *size* whereas the discounts imply that there's some extra
-- *efficiency* to be gained (e.g. beta reductions, case reductions)
-- by inlining.
However, this is highly suspect since it means that we subtract a
*scaled* size from an absolute size, resulting in crazy (e.g. negative)
scores in some cases (#15304). We consequently killed off
ufKeenessFactor and bumped up the ufUseThreshold to compensate.
Adjustment of unfolding use threshold
=====================================
Since this removes a discount from our inlining heuristic, I revisited our
default choice of -funfolding-use-threshold to minimize the change in
overall inlining behavior. Specifically, I measured runtime allocations
and executable size of nofib and the testsuite performance tests built
using compilers (and core libraries) built with several values of
-funfolding-use-threshold.
This comes as a result of a quantitative comparison of testsuite
performance and code size as a function of ufUseThreshold, comparing
GHC trees using values of 50, 60, 70, 80, 90, and 100. The test set
consisted of nofib and the testsuite performance tests.
A full summary of these measurements are found in the description of
!2608
Comparing executable sizes (relative to the base commit) across all
nofib tests, we see that sizes are similar to the baseline:
gmean min max median
thresh
50 -6.36% -7.04% -4.82% -6.46%
60 -5.04% -5.97% -3.83% -5.11%
70 -2.90% -3.84% -2.31% -2.92%
80 -0.75% -2.16% -0.42% -0.73%
90 +0.24% -0.41% +0.55% +0.26%
100 +1.36% +0.80% +1.64% +1.37%
baseline +0.00% +0.00% +0.00% +0.00%
Likewise, looking at runtime allocations we see that 80 gives slightly
better optimisation than the baseline:
gmean min max median
thresh
50 +0.16% -0.16% +4.43% +0.00%
60 +0.09% -0.00% +3.10% +0.00%
70 +0.04% -0.09% +2.29% +0.00%
80 +0.02% -1.17% +2.29% +0.00%
90 -0.02% -2.59% +1.86% +0.00%
100 +0.00% -2.59% +7.51% -0.00%
baseline +0.00% +0.00% +0.00% +0.00%
Finally, I had to add a NOINLINE in T4306 to ensure that `upd` is
worker-wrappered as the test expects. This makes me wonder whether the
inlining heuristic is now too liberal as `upd` is quite a large
function. The same measure was taken in T12600.
Wall clock time compiling Cabal with -O0
thresh 50 60 70 80 90 100 baseline
build-Cabal 93.88 89.58 92.59 90.09 100.26 94.81 89.13
Also, this change happens to avoid the spurious test output in
`plugin-recomp-change` and `plugin-recomp-change-prof` (see #17308).
Metric Decrease:
hie002
T12234
T13035
T13719
T14683
T4801
T5631
T5642
T9020
T9872d
T9961
Metric Increase:
T12150
T12425
T13701
T14697
T15426
T1969
T3064
T5837
T6048
T9203
T9872a
T9872b
T9872c
T9872d
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/255418da5d264fb2758bc70925adb2094f34adc3">255418da</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-07T18:36:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: type-checker (#13009)
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04b6cf947ea065a210a216cc91f918cc1660d430">04b6cf94</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-07T19:43:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make NoExtCon fields strict
This changes every unused TTG extension constructor to be strict in
its field so that the pattern-match coverage checker is smart enough
any such constructors are unreachable in pattern matches. This lets
us remove nearly every use of `noExtCon` in the GHC API. The only
ones we cannot remove are ones underneath uses of `ghcPass`, but that
is only because GHC 8.8's and 8.10's coverage checkers weren't smart
enough to perform this kind of reasoning. GHC HEAD's coverage
checker, on the other hand, _is_ smart enough, so we guard these uses
of `noExtCon` with CPP for now.
Bumps the `haddock` submodule.
Fixes #17992.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7802fa17a9a1a0f02fbf95170c13d7a9711a681e">7802fa17</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-08T16:43:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Handle promoted data constructors in typeToLHsType correctly
Instead of using `nlHsTyVar`, which hardcodes `NotPromoted`, have
`typeToLHsType` pick between `Promoted` and `NotPromoted` by checking
if a type constructor is promoted using `isPromotedDataCon`.
Fixes #18020.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce481361fc95405cfadcd8f930629381e80e7f84">ce481361</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-09T16:17:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Use --export-dynamic when linking iserv
As noticed in #17962, the make build system currently does this (see
3ce0e0ba) but the change was never ported to Hadrian.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa66f143a61f2285618c611a27c23815ca588299">fa66f143</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-09T16:17:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">iserv: Don't pass --export-dynamic on FreeBSD
This is definitely a hack but it's probably the best we can do for now.
Hadrian does the right thing here by passing --export-dynamic only to
the linker.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/390751768104cd3d2cb57e2037062916476ebd10">39075176</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-09T16:18:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix CNF handling in compacting GC
Fixes #17937
Previously compacting GC simply ignored CNFs. This is mostly fine as
most (see "What about small compacts?" below) CNF objects don't have
outgoing pointers, and are "large" (allocated in large blocks) and large
objects are not moved or compacted.
However if we do GC *during* sharing-preserving compaction then the CNF
will have a hash table mapping objects that have been moved to the CNF
to their location in the CNF, to be able to preserve sharing.
This case is handled in the copying collector, in `scavenge_compact`,
where we evacuate hash table entries and then rehash the table.
Compacting GC ignored this case.
We now visit CNFs in all generations when threading pointers to the
compacted heap and thread hash table keys. A visited CNF is added to the
list `nfdata_chain`. After compaction is done, we re-visit the CNFs in
that list and rehash the tables.
The overhead is minimal: the list is static in `Compact.c`, and link
field is added to `StgCompactNFData` closure. Programs that don't use
CNFs should not be affected.
To test this CNF tests are now also run in a new way 'compacting_gc',
which just passes `-c` to the RTS, enabling compacting GC for the oldest
generation. Before this patch the result would be:
Unexpected failures:
compact_gc.run compact_gc [bad exit code (139)] (compacting_gc)
compact_huge_array.run compact_huge_array [bad exit code (1)] (compacting_gc)
With this patch all tests pass. I can also pass `-c -DS` without any
failures.
What about small compacts? Small CNFs are still not handled by the
compacting GC. However so far I'm unable to write a test that triggers a
runtime panic ("update_fwd: unknown/strange object") by allocating a
small CNF in a compated heap. It's possible that I'm missing something
and it's not possible to have a small CNF.
NoFib Results:
--------------------------------------------------------------------------------
Program Size Allocs Instrs Reads Writes
--------------------------------------------------------------------------------
CS +0.1% 0.0% 0.0% +0.0% +0.0%
CSD +0.1% 0.0% 0.0% 0.0% 0.0%
FS +0.1% 0.0% 0.0% 0.0% 0.0%
S +0.1% 0.0% 0.0% 0.0% 0.0%
VS +0.1% 0.0% 0.0% 0.0% 0.0%
VSD +0.1% 0.0% +0.0% +0.0% -0.0%
VSM +0.1% 0.0% +0.0% -0.0% 0.0%
anna +0.0% 0.0% -0.0% -0.0% -0.0%
ansi +0.1% 0.0% +0.0% +0.0% +0.0%
atom +0.1% 0.0% +0.0% +0.0% +0.0%
awards +0.1% 0.0% +0.0% +0.0% +0.0%
banner +0.1% 0.0% +0.0% +0.0% +0.0%
bernouilli +0.1% 0.0% 0.0% -0.0% +0.0%
binary-trees +0.1% 0.0% -0.0% -0.0% 0.0%
boyer +0.1% 0.0% +0.0% +0.0% +0.0%
boyer2 +0.1% 0.0% +0.0% +0.0% +0.0%
bspt +0.1% 0.0% -0.0% -0.0% -0.0%
cacheprof +0.1% 0.0% -0.0% -0.0% -0.0%
calendar +0.1% 0.0% +0.0% +0.0% +0.0%
cichelli +0.1% 0.0% +0.0% +0.0% +0.0%
circsim +0.1% 0.0% +0.0% +0.0% +0.0%
clausify +0.1% 0.0% -0.0% +0.0% +0.0%
comp_lab_zift +0.1% 0.0% +0.0% +0.0% +0.0%
compress +0.1% 0.0% +0.0% +0.0% 0.0%
compress2 +0.1% 0.0% -0.0% 0.0% 0.0%
constraints +0.1% 0.0% +0.0% +0.0% +0.0%
cryptarithm1 +0.1% 0.0% +0.0% +0.0% +0.0%
cryptarithm2 +0.1% 0.0% +0.0% +0.0% +0.0%
cse +0.1% 0.0% +0.0% +0.0% +0.0%
digits-of-e1 +0.1% 0.0% +0.0% -0.0% -0.0%
digits-of-e2 +0.1% 0.0% -0.0% -0.0% -0.0%
dom-lt +0.1% 0.0% +0.0% +0.0% +0.0%
eliza +0.1% 0.0% +0.0% +0.0% +0.0%
event +0.1% 0.0% +0.0% +0.0% +0.0%
exact-reals +0.1% 0.0% +0.0% +0.0% +0.0%
exp3_8 +0.1% 0.0% +0.0% -0.0% 0.0%
expert +0.1% 0.0% +0.0% +0.0% +0.0%
fannkuch-redux +0.1% 0.0% -0.0% 0.0% 0.0%
fasta +0.1% 0.0% -0.0% +0.0% +0.0%
fem +0.1% 0.0% -0.0% +0.0% 0.0%
fft +0.1% 0.0% -0.0% +0.0% +0.0%
fft2 +0.1% 0.0% +0.0% +0.0% +0.0%
fibheaps +0.1% 0.0% +0.0% +0.0% +0.0%
fish +0.1% 0.0% +0.0% +0.0% +0.0%
fluid +0.0% 0.0% +0.0% +0.0% +0.0%
fulsom +0.1% 0.0% -0.0% +0.0% 0.0%
gamteb +0.1% 0.0% +0.0% +0.0% 0.0%
gcd +0.1% 0.0% +0.0% +0.0% +0.0%
gen_regexps +0.1% 0.0% -0.0% +0.0% 0.0%
genfft +0.1% 0.0% +0.0% +0.0% +0.0%
gg +0.1% 0.0% 0.0% +0.0% +0.0%
grep +0.1% 0.0% -0.0% +0.0% +0.0%
hidden +0.1% 0.0% +0.0% -0.0% 0.0%
hpg +0.1% 0.0% -0.0% -0.0% -0.0%
ida +0.1% 0.0% +0.0% +0.0% +0.0%
infer +0.1% 0.0% +0.0% 0.0% -0.0%
integer +0.1% 0.0% +0.0% +0.0% +0.0%
integrate +0.1% 0.0% -0.0% -0.0% -0.0%
k-nucleotide +0.1% 0.0% +0.0% +0.0% 0.0%
kahan +0.1% 0.0% +0.0% +0.0% +0.0%
knights +0.1% 0.0% -0.0% -0.0% -0.0%
lambda +0.1% 0.0% +0.0% +0.0% -0.0%
last-piece +0.1% 0.0% +0.0% 0.0% 0.0%
lcss +0.1% 0.0% +0.0% +0.0% 0.0%
life +0.1% 0.0% -0.0% +0.0% +0.0%
lift +0.1% 0.0% +0.0% +0.0% +0.0%
linear +0.1% 0.0% -0.0% +0.0% 0.0%
listcompr +0.1% 0.0% +0.0% +0.0% +0.0%
listcopy +0.1% 0.0% +0.0% +0.0% +0.0%
maillist +0.1% 0.0% +0.0% -0.0% -0.0%
mandel +0.1% 0.0% +0.0% +0.0% 0.0%
mandel2 +0.1% 0.0% +0.0% +0.0% +0.0%
mate +0.1% 0.0% +0.0% 0.0% +0.0%
minimax +0.1% 0.0% -0.0% 0.0% -0.0%
mkhprog +0.1% 0.0% +0.0% +0.0% +0.0%
multiplier +0.1% 0.0% +0.0% 0.0% 0.0%
n-body +0.1% 0.0% +0.0% +0.0% +0.0%
nucleic2 +0.1% 0.0% +0.0% +0.0% +0.0%
para +0.1% 0.0% 0.0% +0.0% +0.0%
paraffins +0.1% 0.0% +0.0% -0.0% 0.0%
parser +0.1% 0.0% -0.0% -0.0% -0.0%
parstof +0.1% 0.0% +0.0% +0.0% +0.0%
pic +0.1% 0.0% -0.0% -0.0% 0.0%
pidigits +0.1% 0.0% +0.0% -0.0% -0.0%
power +0.1% 0.0% +0.0% +0.0% +0.0%
pretty +0.1% 0.0% -0.0% -0.0% -0.1%
primes +0.1% 0.0% -0.0% -0.0% -0.0%
primetest +0.1% 0.0% -0.0% -0.0% -0.0%
prolog +0.1% 0.0% -0.0% -0.0% -0.0%
puzzle +0.1% 0.0% -0.0% -0.0% -0.0%
queens +0.1% 0.0% +0.0% +0.0% +0.0%
reptile +0.1% 0.0% -0.0% -0.0% +0.0%
reverse-complem +0.1% 0.0% +0.0% 0.0% -0.0%
rewrite +0.1% 0.0% -0.0% -0.0% -0.0%
rfib +0.1% 0.0% +0.0% +0.0% +0.0%
rsa +0.1% 0.0% -0.0% +0.0% -0.0%
scc +0.1% 0.0% -0.0% -0.0% -0.1%
sched +0.1% 0.0% +0.0% +0.0% +0.0%
scs +0.1% 0.0% +0.0% +0.0% +0.0%
simple +0.1% 0.0% -0.0% -0.0% -0.0%
solid +0.1% 0.0% +0.0% +0.0% +0.0%
sorting +0.1% 0.0% -0.0% -0.0% -0.0%
spectral-norm +0.1% 0.0% +0.0% +0.0% +0.0%
sphere +0.1% 0.0% -0.0% -0.0% -0.0%
symalg +0.1% 0.0% -0.0% -0.0% -0.0%
tak +0.1% 0.0% +0.0% +0.0% +0.0%
transform +0.1% 0.0% +0.0% +0.0% +0.0%
treejoin +0.1% 0.0% +0.0% -0.0% -0.0%
typecheck +0.1% 0.0% +0.0% +0.0% +0.0%
veritas +0.0% 0.0% +0.0% +0.0% +0.0%
wang +0.1% 0.0% 0.0% +0.0% +0.0%
wave4main +0.1% 0.0% +0.0% +0.0% +0.0%
wheel-sieve1 +0.1% 0.0% +0.0% +0.0% +0.0%
wheel-sieve2 +0.1% 0.0% +0.0% +0.0% +0.0%
x2n1 +0.1% 0.0% +0.0% +0.0% +0.0%
--------------------------------------------------------------------------------
Min +0.0% 0.0% -0.0% -0.0% -0.1%
Max +0.1% 0.0% +0.0% +0.0% +0.0%
Geometric Mean +0.1% -0.0% -0.0% -0.0% -0.0%
Bumping numbers of nonsensical perf tests:
Metric Increase:
T12150
T12234
T12425
T13035
T5837
T6048
It's simply not possible for this patch to increase allocations, and
I've wasted enough time on these test in the past (see #17686). I think
these tests should not be perf tests, but for now I'll bump the numbers.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dce50062e35d3246b63fba9357dea6313c23c780">dce50062</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-09T16:18:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rts: show errno on failure (#18033)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/045139f40089f288866c1c59c7379be82ecdaf34">045139f4</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-04-09T23:10:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add an example to liftIO and explain its purpose
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/101fab6ee6cee72b9ffce40e45ebf39466d1c01a">101fab6e</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-09T23:11:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Special case `isConstraintKindCon` on `AlgTyCon`
Previously, the `tyConUnique` record selector would unfold into a huge
case expression that would be inlined in all call sites, such as the
`INLINE`-annotated `coreView`, see #18026. `constraintKindTyConKey` only
occurs as the `Unique` of an `AlgTyCon` anyway, so we can make the code
a lot more compact, but have to move it to GHC.Core.TyCon.
Metric Decrease:
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f5212dfc10414212e42247c2f2dcc45252f7e1d2">f5212dfc</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-04-09T23:11:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: No need to attach a StrictSig to DataCon workers
In GHC.Types.Id.Make we were giving a strictness signature to every data
constructor wrapper Id that we weren't looking at in demand analysis
anyway. We used to use its CPR info, but that has its own CPR signature
now.
`Note [Data-con worker strictness]` then felt very out of place, so I
moved it to GHC.Core.DataCon.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/75a185dc2a648ab1f592d401daa5efcacb451c83">75a185dc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-09T23:12:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix --summary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/723062edf6191084a99787d3f235183cf6b7d051">723062ed</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-10T09:18:14+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Move no_lint to the top level, tweak hie002
- We don't want to benchmark linting so disable lints in hie002 perf
test
- Move no_lint to the top-level to be able to use it in tests other than
those in `testsuite/tests/perf/compiler`.
- Filter out -dstg-lint in no_lint.
- hie002 allocation numbers on 32-bit are unstable, so skip it on 32-bit
Metric Decrease:
hie002
ManyConstructors
T12150
T12234
T13035
T1969
T4801
T9233
T9961
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcafaa82a0223afd5d103e052ab9a097a676e5ea">bcafaa82</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-04-10T19:29:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: mark T11531 fragile
The test depends on a link editor allowing undefined symbols in an ELF
shared object. This is the standard but it seems some distributions
patch their link editor. See the report by @hsyl20 in #11531.
Fixes #11531
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0889f5eecfea8af6a9d74d48d9d86ff3aea331d6">0889f5ee</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-04-12T11:44:52+09:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Fix comment for a language extension
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd4f92b5f4251f1a37d1e08ee97d99f2ccb41f26">cd4f92b5</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-12T11:20:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Significant refactor of Lint
This refactoring of Lint was triggered by #17923, which is
fixed by this patch.
The main change is this. Instead of
lintType :: Type -> LintM LintedKind
we now have
lintType :: Type -> LintM LintedType
Previously, all of typeKind was effectively duplicate in lintType.
Moreover, since we have an ambient substitution, we still had to
apply the substition here and there, sometimes more than once. It
was all very tricky, in the end, and made my head hurt.
Now, lintType returns a fully linted type, with all substitutions
performed on it. This is much simpler.
The same thing is needed for Coercions. Instead of
lintCoercion :: OutCoercion
-> LintM (LintedKind, LintedKind,
LintedType, LintedType, Role)
we now have
lintCoercion :: Coercion -> LintM LintedCoercion
Much simpler! The code is shorter and less bug-prone.
There are a lot of knock on effects. But life is now better.
Metric Decrease:
T1969
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0efaf301fec9ed9ea827392cbe03de3335e995c7">0efaf301</a></strong>
<div>
<span>by Josh Meredith</span>
<i>at 2020-04-12T11:21:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement extensible interface files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54ca66a7d30d7f7cfbf3753ebe547f5a20d76b96">54ca66a7</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-12T11:22:10-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use conLikeUserTyVarBinders to quantify field selector types
This patch:
1. Writes up a specification for how the types of top-level field
selectors should be determined in a new section of the GHC User's
Guide, and
2. Makes GHC actually implement that specification by using
`conLikeUserTyVarBinders` in `mkOneRecordSelector` to preserve the
order and specificity of type variables written by the user.
Fixes #18023.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35799dda07813e4c510237290a631d4d11fb92d2">35799dda</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-12T11:22:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't --export-dynamic on Darwin
When fixing #17962 I neglected to consider that --export-dynamic is only
supported on ELF platforms.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8029816fda7602a8163c4d2703ff02982a3e48c">e8029816</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-12T11:23:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add an INLINE pragma to Control.Category.>>>
This fixes #18013 by adding INLINE pragmas to both Control.Category.>>>
and GHC.Desugar.>>>. The functional change in this patch is tiny (just
two lines of pragmas!), but an accompanying Note explains in gory
detail what’s going on.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0da186c1b5a47e08e91c1c674d46c040c83932fc">0da186c1</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-04-14T07:55:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Change zipWith to zipWithEqual in a few places
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/074c1ccd3f8c3fcab117e336316173e8e869230a">074c1ccd</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-14T07:55:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small change to the windows ticker.
We already have a function to go from time to ms so use it.
Also expand on the state of timer resolution.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b69cc8842aa7e2df52b92a9c9ad3b9d8dcf624ab">b69cc884</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-04-14T07:56:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: get rid of unnecessary levels of nesting in source-dist
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d0c3b0696f1ca809ebd83b5fc2c0b911cde38e77">d0c3b069</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-04-14T07:57:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc (Foldable): Add examples to Data.Foldable
See #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b08e0c06e038448a63aa9bd7f163b23d824ba4b">5b08e0c0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T23:28:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">StgCRun: Enable unwinding only on Linux
It's broken on macOS due and SmartOS due to assembler differences
(#15207) so let's be conservative in enabling it. Also, refactor things
to make the intent clearer.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/27cc2e7b1c1268e59c9d16b4530f27c0d40e9464">27cc2e7b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T23:28:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Don't mark evacuate_large as inline
This function has two callsites and is quite large. GCC consequently
decides not to inline and warns instead. Given the situation, I can't
blame it. Let's just remove the inline specifier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9853fc5e3556e733b56976b0a2fce9e82130a9ef">9853fc5e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T23:29:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Enable large file support for OFD locking impl.
Not only is this a good idea in general but this should also avoid
issue #17950 by ensuring that off_t is 64-bits.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7b41f21bbfa9e266ba6654b08c3f9fec549c8bca">7b41f21b</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-04-14T23:30:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Make -i paths absolute
The primary reason for this change is that ghcide does not work with
relative paths. It also matches what cabal and stack do, they always
pass absolute paths.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/41230e2601703df0233860be3f7d53f3a01bdbe5">41230e26</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Zero out pinned block alignment slop when profiling
The heap profiler currently cannot traverse pinned blocks because of
alignment slop. This used to just be a minor annoyance as the whole block
is accounted into a special cost center rather than the respective object's
CCS, cf. #7275. However for the new root profiler we would like to be able
to visit _every_ closure on the heap. We need to do this so we can get rid
of the current 'flip' bit hack in the heap traversal code.
Since info pointers are always non-zero we can in principle skip all the
slop in the profiler if we can rely on it being zeroed. This assumption
caused problems in the past though, commit a586b33f8e ("rts: Correct
handling of LARGE ARR_WORDS in LDV profiler"), part of !1118, tried to use
the same trick for BF_LARGE objects but neglected to take into account that
shrink*Array# functions don't ensure that slop is zeroed when not
compiling with profiling.
Later, commit 0c114c6599 ("Handle large ARR_WORDS in heap census (fix
as we will only be assuming slop is zeroed when profiling is on.
This commit also reduces the ammount of slop we introduce in the first
place by calculating the needed alignment before doing the allocation for
small objects where we know the next available address. For large objects
we don't know how much alignment we'll have to do yet since those details
are hidden behind the allocateMightFail function so there we continue to
allocate the maximum additional words we'll need to do the alignment.
So we don't have to duplicate all this logic in the cmm code we pull it
into the RTS allocatePinned function instead.
Metric Decrease:
T7257
haddock.Cabal
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15fa9bd6dd2d0b8d1fcd7135c85ea0d60853340d">15fa9bd6</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Expand and add more notes regarding slop
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/caf3f444bcc29f75145834207da00d938c08c2d3">caf3f444</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: allocatePinned: Fix confusion about word/byte units
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c3c0f662df06500a11970fd391d0a88e081a5296">c3c0f662</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Underline some Notes as is conventional
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e149dea9bb89b77d34f50075946d6b4751a974f0">e149dea9</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix nomenclature in OVERWRITING_CLOSURE macros
The additional commentary introduced by commit 8916e64e5437 ("Implement
shrinkSmallMutableArray# and resizeSmallMutableArray#.") unfortunately got
this wrong. We set 'prim' to true in overwritingClosureOfs because we
_don't_ want to call LDV_recordDead().
The reason is because of this "inherently used" distinction made in the LDV
profiler so I rename the variable to be more appropriate.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1dd3d18c2afd9e6009cd53295d26f8b31ca58fec">1dd3d18c</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove call to LDV_RECORD_CREATE for array resizing
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19de2fb090a25ab0d640d0cd5aef09f35e7455a0">19de2fb0</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-14T23:31:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Assert LDV_recordDead is not called for inherently used closures
The comments make it clear LDV_recordDead should not be called for
inhererently used closures, so add an assertion to codify this fact.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b934e30417a767063625494ecf135c9d6006f71">0b934e30</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-14T23:32:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump template-haskell version to 2.17.0.0
This requires bumping the `exceptions` and `text` submodules to bring
in commits that bump their respective upper version bounds on
`template-haskell`.
Fixes #17645. Fixes #17696.
Note that the new `text` commit includes a fair number of additions
to the Haddocks in that library. As a result, Haddock has to do more
work during the `haddock.Cabal` test case, increasing the number of
allocations it requires. Therefore,
-------------------------
Metric Increase:
haddock.Cabal
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22cc8e513fcfa89a4391f075534d903596a05895">22cc8e51</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-15T17:48:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18052 by using pprPrefixOcc in more places
This fixes several small oversights in the choice of pretty-printing
function to use. Fixes #18052.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ec77b2f16a78b13f54794c954953d8878dea9db2">ec77b2f1</a></strong>
<div>
<span>by Daniel Gröber</span>
<i>at 2020-04-15T17:49:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: ProfHeap: Fix wrong time in last heap profile sample
We've had this longstanding issue in the heap profiler, where the time of
the last sample in the profile is sometimes way off causing the rendered
graph to be quite useless for long runs.
It seems to me the problem is that we use mut_user_time() for the last
sample as opposed to getRTSStats(), which we use when calling heapProfile()
in GC.c.
The former is equivalent to getProcessCPUTime() but the latter does
some additional stuff:
getProcessCPUTime() - end_init_cpu - stats.gc_cpu_ns -
stats.nonmoving_gc_cpu_ns
So to fix this just use getRTSStats() in both places.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85fc32f03a6df92ec8d4ec9accca3c11b31a1596">85fc32f0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-17T12:45:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix dyn_o/dyn_hi rule (#17534)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfde3b76ac7f5a72eca012fe34ac1340a5ce2011">bfde3b76</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-17T12:46:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18065 by fixing an InstCo oversight in Core Lint
There was a small thinko in Core Lint's treatment of `InstCo`
coercions that ultimately led to #18065. The fix: add an apostrophe.
That's it!
Fixes #18065.
Co-authored-by: Simon Peyton Jones <simonpj@microsoft.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a05348ebaa11d563ab2e33325055317ff3cb8afc">a05348eb</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Change the fail operator argument of BindStmt to be a Maybe
Don't use noSyntaxExpr for it. There is no good way to defensively case
on that, nor is it clear one ought to do so.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/79e27144db7011f6d01a2f5ed15fd110d579bb8e">79e27144</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use trees that grow for rebindable operators for `<-` binds
Also add more documentation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18bc16ed78dfa1fe9498c5ac1ca38e9f84267872">18bc16ed</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use FailOperator in more places, define a couple datatypes (XBindStmtRn and XBindStmtTc) to help clarify the meaning of XBindStmt in the renamer and typechecker
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c">84cc8394</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-18T13:20:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a missing zonk in tcHsPartialType
I omitted a vital zonk when refactoring tcHsPartialType in
commit 48fb3482f8cbc8a4b37161021e846105f980eed4
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Wed Jun 5 08:55:17 2019 +0100
Fix typechecking of partial type signatures
This patch fixes it and adds commentary to explain why.
Fixes #18008
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ee96ac1aa2cbff4e70bc45988930d64599029f2">2ee96ac1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump FreeBSD bootstrap compiler to 8.10.1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/434312e5fdde91d6ad7b6d199bbb560a72ab6b89">434312e5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Enable FreeBSD job for so-labelled MRs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ddffb2278a22b7c0e3a9fce11ada67a471243409">ddffb227</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use rules syntax for conditional jobs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2586828a30202a28dcacac9ab7fc83c43da9e02">e2586828</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ab6cd548f284732a7f89d78c2b89b1bfc4ea1d">15ab6cd5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-18T13:21:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve prepForeignCall error reporting
Show parameters and description of the error code when ffi_prep_cif
fails.
This may be helpful for debugging #17018.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ca52151881451ce5b3a7740d003e811b586140d">3ca52151</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-18T20:04:14+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Opt renaming
* GHC.Core.Op => GHC.Core.Opt
* GHC.Core.Opt.Simplify.Driver => GHC.Core.Opt.Driver
* GHC.Core.Opt.Tidy => GHC.Core.Tidy
* GHC.Core.Opt.WorkWrap.Lib => GHC.Core.Opt.WorkWrap.Utils
As discussed in:
* https://mail.haskell.org/pipermail/ghc-devs/2020-April/018758.html
* https://gitlab.haskell.org/ghc/ghc/issues/13009#note_264650
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15312bbb53f247c9ed2c5cf75100a9f44c1c7227">15312bbb</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-18T20:04:46+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules (#13009)
* SysTools
* Parser
* GHC.Builtin
* GHC.Iface.Recomp
* Settings
Update Haddock submodule
Metric Decrease:
Naperian
parsing001
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eaed0a3289e4c24ff1a70c6fc4b7f8bae6cd2dd3">eaed0a32</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-19T03:16:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing addInScope call for letrec binders in OccurAnal
This fixes #18044, where a shadowed variable was incorrectly substituted
by the binder swap on the RHS of a floated-in letrec. This can only
happen when the uniques line up *just* right, so writing a regression
test would be very difficult, but at least the fix is small and
straightforward.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/36882493fcaa9dd2eefa7184929765189ac339ad">36882493</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2020-04-20T04:36:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Derive Ord instance for Extension
Metric Increase:
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b43365ad62d73afd5c58467ab9a4f9523ab09c18">b43365ad</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-20T04:37:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a buglet in redundant-constraint warnings
Ticket #18036 pointed out that we were reporting a redundant
constraint when it really really wasn't.
Turned out to be a buglet in the SkolemInfo for the
relevant implication constraint. Easily fixed!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d5fae7da02cff1c7ec7b8e472f85d23aef098968">d5fae7da</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-20T14:39:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark T12010 fragile on 32-bit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bca02fca0119354a6201fd5d019a553015ba2dd8">bca02fca</a></strong>
<div>
<span>by Adam Sandberg Ericsson</span>
<i>at 2020-04-21T06:38:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: drop note about not supporting shared libraries on unix systems
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6655f93324b7f1d30a6baaedfecae455d5e08e39">6655f933</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use ParserFlags in GHC.Runtime.Eval (#17957)
Instead of passing `DynFlags` to functions such as `isStmt` and
`hasImport` in `GHC.Runtime.Eval` we pass `ParserFlags`. It's a much
simpler structure that can be created purely with `mkParserFlags'`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70be0fbcefa07ff164437476bf2809ea7c3ff495">70be0fbc</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Runtime: avoid DynFlags (#17957)
* add `getPlatform :: TcM Platform` helper
* remove unused `DynFlags` parameter from `emptyPLS`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/35e43d48a9a3ab22da90c4c2ea2c805fe762b9c5">35e43d48</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid DynFlags in Ppr code (#17957)
* replace `DynFlags` parameters with `SDocContext` parameters for a few
Ppr related functions: `bufLeftRenderSDoc`, `printSDoc`,
`printSDocLn`, `showSDocOneLine`.
* remove the use of `pprCols :: DynFlags -> Int` in Outputable. We
already have the information via `sdocLineLength :: SDocContext ->
Int`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce5c2999d2e356d034fbf1045a2383c0ac24f15f">ce5c2999</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid using sdocWithDynFlags (#17957)
Remove one use of `sdocWithDynFlags` from `GHC.CmmToLlvm.llvmCodeGen'`
and from `GHC.Driver.CodeOutput.profilingInitCode`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f2a98996e7792f572ab685f29742e3476be81166">f2a98996</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid `sdocWithDynFlags` in `pprCLbl` (#17957)
* add a `DynFlags` parameter to `pprCLbl`
* put `maybe_underscore` and `pprAsmCLbl` in a `where` clause to avoid
`DynFlags` parameters
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/747093b7c23a1cf92b564eb3d9efe2adc15330df">747093b7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-21T06:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">CmmToAsm DynFlags refactoring (#17957)
* Remove `DynFlags` parameter from `isDynLinkName`: `isDynLinkName` used
to test the global `ExternalDynamicRefs` flag. Now we test it outside of
`isDynLinkName`
* Add new fields into `NCGConfig`: current unit id, sse/bmi versions,
externalDynamicRefs, etc.
* Replace many uses of `DynFlags` by `NCGConfig`
* Moved `BMI/SSE` datatypes into `GHC.Platform`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffd7eef22f197ba44f0ced97ebc988f2d7d643a4">ffd7eef2</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-04-22T23:09:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">stg-spec: Modify file paths according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* GHC/Stg/Syntax.hs <= stgSyn/StgSyn.hs
* GHC/Types/Literal.hs <= basicTypes/Literal.hs
* GHC/Types/CostCentre.hs <= profiling/CostCentre.hs
This patch also updates old file path [2]:
* utils/genapply/Main.hs <= utils/genapply/GenApply.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[2]: commit 0cc4aad36f
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8a5d81b9358466f8889f679bfea9f796d85f7f3">e8a5d81b</a></strong>
<div>
<span>by Jonathan DK Gibbons</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the `MatchResult` type in the desugarer
This way, it does a better job of proving whether or not the fail operator is used.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dcb7fe5aa2bc331fa71b537b042ec08a7c79b1ac">dcb7fe5a</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove panic in dsHandleMonadicFailure
Rework dsHandleMonadicFailure to be correct by construction instead of
using an unreachable panic.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cde23cd47170cc33845b6859a47dd06ee85094d8">cde23cd4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Inline `adjustMatchResult`
It is just `fmap`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72cb6bcc23d2540274aac7d1b80682ef092f1615">72cb6bcc</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Generalize type of `matchCanFail`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/401f7bb312aa6c570287d313f8b587aaebca72b2">401f7bb3</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-22T23:10:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">`MatchResult'` -> `MatchResult`
Inline `MatchResult` alias accordingly.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6c9fae2342f19ab3e6ac688825a3817b23bf1fcc">6c9fae23</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-22T23:11:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark DataCon wrappers CONLIKE
Now that DataCon wrappers don’t inline until phase 0 (see commit
b78cc64e923716ac0512c299f42d4d0012306c05), it’s important that
case-of-known-constructor and RULE matching be able to see saturated
applications of DataCon wrappers in unfoldings. Making them conlike is a
natural way to do it, since they are, in fact, precisely the sort of
thing the CONLIKE pragma exists to solve.
Fixes #18012.
This also bumps the version of the parsec submodule to incorporate a
patch that avoids a metric increase on the haddock perf tests. The
increase was not really a flaw in this patch, as parsec was implicitly
relying on inlining heuristics. The patch to parsec just adds some
INLINABLE pragmas, and we get a nice performance bump out of it (well
beyond the performance we lost from this patch).
Metric Decrease:
T12234
WWRec
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/48b8951e819e5d7d06ad7e168323de320d87bbd6">48b8951e</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-04-22T23:11:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix tab-completion for :break (#17989)
In tab-completion for the `:break` command, only those
identifiers should be shown, that are accepted in the
`:break` command. Hence these identifiers must be
- defined in an interpreted module
- top-level
- currently in scope
- listed in a `ModBreaks` value as a possible breakpoint.
The identifiers my be qualified or unqualified.
To get all possible top-level breakpoints for tab-completeion
with the correct qualification do:
1. Build the list called `pifsBreaks` of all pairs of
(Identifier, module-filename) from the `ModBreaks` values.
Here all identifiers are unqualified.
2. Build the list called `pifInscope` of all pairs of
(Identifiers, module-filename) with identifiers from
the `GlobalRdrEnv`. Take only those identifiers that are
in scope and have the correct prefix.
Here the identifiers may be qualified.
3. From the `pifInscope` list seclect all pairs that can be
found in the `pifsBreaks` list, by comparing only the
unqualified part of the identifier.
The remaining identifiers can be used for tab-completion.
This ensures, that we show only identifiers, that can be used
in a `:break` command.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34a45ee600d5346f5d1728047fa185698ed7ee84">34a45ee6</a></strong>
<div>
<span>by Peter Trommler</span>
<i>at 2020-04-22T23:12:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PPC NCG: Add DWARF constants and debug labels
Fixes #11261
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffde234854f49dba9ec4735aad74b30fd2deee29">ffde2348</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-22T23:13:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do eager instantation in terms
This patch implements eager instantiation, a small but critical change
to the type inference engine, #17173. The main change is this:
When inferring types, always return an instantiated type
(for now, deeply instantiated; in future shallowly instantiated)
There is more discussion in
https://www.tweag.io/posts/2020-04-02-lazy-eager-instantiation.html
There is quite a bit of refactoring in this patch:
* The ir_inst field of GHC.Tc.Utils.TcType.InferResultk
has entirely gone. So tcInferInst and tcInferNoInst have collapsed
into tcInfer.
* Type inference of applications, via tcInferApp and
tcInferAppHead, are substantially refactored, preparing
the way for Quick Look impredicativity.
* New pure function GHC.Tc.Gen.Expr.collectHsArgs and applyHsArgs
are beatifully dual. We can see the zipper!
* GHC.Tc.Gen.Expr.tcArgs is now much nicer; no longer needs to return
a wrapper
* In HsExpr, HsTypeApp now contains the the actual type argument,
and is used in desugaring, rather than putting it in a mysterious
wrapper.
* I struggled a bit with good error reporting in
Unify.matchActualFunTysPart. It's a little bit simpler than before,
but still not great.
Some smaller things
* Rename tcPolyExpr --> tcCheckExpr
tcMonoExpr --> tcLExpr
* tcPatSig moves from GHC.Tc.Gen.HsType to GHC.Tc.Gen.Pat
Metric Decrease:
T9961
Reduction of 1.6% in comiler allocation on T9961, I think.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f84aca31290afc11acde0f86969a535e519e1d5">6f84aca3</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-22T23:13:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Ensure that sigaction structs are initialized
I noticed these may have uninitialized fields when looking into #18037.
The reporter says that zeroing them doesn't fix the MSAN failures they
observe but zeroing them is the right thing to do regardless.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c29f0fa6ee831ec8a223561312d7176ef87a7ece">c29f0fa6</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-04-22T23:14:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add "ddump-cmm-opt" as alias for "ddump-opt-cmm".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b4a8b60a5b403e02117ab0a30a386664845586b">4b4a8b60</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-22T23:14:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvmGen: Remove -fast-llvm flag
Issue #18076 drew my attention to the undocumented `-fast-llvm` flag for
the LLVM code generator introduced in
22733532171330136d87533d523f565f2a4f102f. Speaking to Moritz about this,
the motivation for this flag was to avoid potential incompatibilities
between LLVM and the assembler/linker toolchain by making LLVM
responsible for machine-code generation.
Unfortunately, this cannot possibly work: the LLVM backend's mangler
performs a number of transforms on the assembler generated by LLVM that
are necessary for correctness. These are currently:
* mangling Haskell functions' symbol types to be `object` instead of
`function` on ELF platforms (necessary for tables-next-to-code)
* mangling AVX instructions to ensure that we don't assume alignment
(which LLVM otherwise does)
* mangling Darwin's subsections-via-symbols directives
Given that these are all necessary I don't believe that we can support
`-fast-llvm`. Let's rather remove it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/831b66425aa3a24e769ace8d4649299ade021717">831b6642</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-04-22T23:15:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix build warning; add more informative information to the linker; fix linker for empty sections
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c409961aea59d2fe2ae71036a1ae6d94c4ee05c8">c409961a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-22T23:16:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update commentary and slightly refactor GHC.Tc.Deriv.Infer
There was some out-of-date commentary in `GHC.Tc.Deriv.Infer` that
has been modernized. Along the way, I removed the `bad` constraints
in `simplifyDeriv`, which did not serve any useful purpose (besides
being printed in debugging output).
Fixes #18073.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/125aa2b8b8bb402d7819c3a35255b65c15b8bf9a">125aa2b8</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-22T23:16:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove leftover comment in tcRnModule', redundant bind
The code for the comment was moved in dc8c03b2a5c but the comment was
forgotten.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8ea37b01b6ab16937f7b528b6bbae9fade9f1361">8ea37b01</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-22T23:17:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">RTS: workaround a Linux kernel bug in timerfd
Reading a timerfd may return 0: https://lkml.org/lkml/2019/8/16/335.
This is currently undocumented behavior and documentation "won't happen
anytime soon" (https://lkml.org/lkml/2020/2/13/295).
With this patch, we just ignore the result instead of crashing. It may
fix #18033 but we can't be sure because we don't have enough
information.
See also this discussion about the kernel bug:
https://github.com/Azure/sonic-swss-common/pull/302/files/1f070e7920c2e5d63316c0105bf4481e73d72dc9
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd8409c26d4370bf2cdcd76801974e99a9adf7b0">cd8409c2</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-23T11:39:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Create di_scoped_tvs for associated data family instances properly
See `Note [Associated data family instances and di_scoped_tvs]` in
`GHC.Tc.TyCl.Instance`, which explains all of the moving parts.
Fixes #18055.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/339e8ece1c844af5c9165efbc3a928890c2f75c7">339e8ece</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-23T11:40:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian/ghci: Allow arguments to be passed to GHCi
Previously the arguments passed to hadrian/ghci were passed both to
`hadrian` and GHCi. This is rather odd given that there are essentially
not arguments in the intersection of the two. Let's just pass them to
GHCi; this allows `hadrian/ghci -Werror`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5946c85abcf66555cdbcd3eed02cb8f512b6110c">5946c85a</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-23T11:40:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Don't attempt to read .std{err,out} files if they don't exist
Simon reports that he was previously seeing framework failures due to
an attempt to read the non-existing T13456.stderr. While I don't know
exactly what this is due to, it does seem like a non-existing
.std{out,err} file should be equivalent to an empty file. Teach the
testsuite driver to treat it as such.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c42754d5fdd3c2db554d9541bab22d1b3def4be7">c42754d5</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-23T18:32:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Trees That Grow refactor for `ConPat` and `CoPat`
- `ConPat{In,Out}` -> `ConPat`
- `CoPat` -> `XPat (CoPat ..)`
Note that `GHC.HS.*` still uses `HsWrap`, but only when `p ~ GhcTc`.
After this change, moving the type family instances out of `GHC.HS.*` is
sufficient to break the cycle.
Add XCollectPat class to decide how binders are collected from XXPat based on the pass.
Previously we did this with IsPass, but that doesn't work for Haddock's
DocNameI, and the constraint doesn't express what actual distinction is being
made. Perhaps a class for collecting binders more generally is in order, but we
haven't attempted this yet.
Pure refactor of code around ConPat
- InPat/OutPat synonyms removed
- rename several identifiers
- redundant constraints removed
- move extension field in ConPat to be first
- make ConPat use record syntax more consistently
Fix T6145 (ConPatIn became ConPat)
Add comments from SPJ.
Add comment about haddock's use of CollectPass.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72da0c29cd7c336cdce3b36d1dd9e8b65a53afbd">72da0c29</a></strong>
<div>
<span>by mniip</span>
<i>at 2020-04-23T18:33:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add :doc to GHC.Prim
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c23e2e37d6c937a425c53da643aec90bda01ef6">2c23e2e3</a></strong>
<div>
<span>by mniip</span>
<i>at 2020-04-23T18:33:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Include docs for non-primop entries in primops.txt as well
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0ac29c885fba7ed69de83a597cdbd03696c9ed13">0ac29c88</a></strong>
<div>
<span>by mniip</span>
<i>at 2020-04-23T18:33:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Prim docs: note and test
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0fbfc7582fb81314dc28a056536737fb5eeaa6e">b0fbfc75</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-24T12:07:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch order on `GhcMake.IsBoot`
In !1798 we were requested to replace many `Bool`s with this data type.
But those bools had `False` meaning `NotBoot`, so the `Ord` instance
would be flipped if we use this data-type as-is.
Since the planned formally-`Bool` occurrences vastly outnumber the
current occurrences, we figured it would be better to conform the `Ord`
instance to how the `Bool` is used now, fixing any issues, rather than
fix them currently with the bigger refactor later in !1798. That way,
!1798 can be a "pure" refactor with no behavioral changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af332442123878c1b61d236dce46418efcbe8750">af332442</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-26T13:55:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Utils and Data (#13009)
Update Haddock submodule
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd4434c8e77213bf3e6f83227fd8802c9f2a6fe2">cd4434c8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-26T13:55:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix misleading Ptr phantom type in SerializedCompact (#15653)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22bf5c738e0339fa12940414d6448896c6733808">22bf5c73</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-26T13:55:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweak includes in non-moving GC headers
We don't use hash tables in non-moving GC so remove the includes.
This breaks Compact.c as existing includes no longer include Hash.h, so
include Hash.h explicitly in Compact.c.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99823ed24b22447b14202ca57f75550773c44dbe">99823ed2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-27T20:24:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TH: fix Show/Eq/Ord instances for Bytes (#16457)
We shouldn't compare pointer values but the actual bytes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c62271a21b1ba1d207aaebf370c87dd884fa6ae1">c62271a2</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-04-27T20:25:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: always capture both stdout and stderr when running a builder fails
The idea being that when a builder('s command) fails, we quite likely want to
have all the information available to figure out why. Depending on the builder
_and_ the particular problem, the useful bits of information can be printed
on stdout or stderr.
We accomplish this by defining a simple wrapper for Shake's `cmd` function,
that just _always_ captures both streams in case the command returns a non-zero
exit code, and by using this wrapper everywhere in `hadrian/src/Builder.hs`.
Fixes #18089.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b9764db7c190de377c06dfc71bfe6e4b37c7eb0">4b9764db</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-28T15:40:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define a Quote IO instance
Fixes #18103.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/518a63d4d7e31e49a81ad66d5e5ccb1f790f6de9">518a63d4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-28T15:40:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make boxed 1-tuples have known keys
Unlike other tuples, which use special syntax and are "known" by way
of a special `isBuiltInOcc_maybe` code path, boxed 1-tuples do not
use special syntax. Therefore, in order to make sure that the
internals of GHC are aware of the `data Unit a = Unit a` definition
in `GHC.Tuple`, we give `Unit` known keys. For the full details, see
`Note [One-tuples] (Wrinkle: Make boxed one-tuple names have known keys)`
in `GHC.Builtin.Types`.
Fixes #18097.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2cfc4ab9710c873a55e9a44aac9dacb06ecce36f">2cfc4ab9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document backpack fields in DynFlags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10a2ba90aa6a788677104cc43318c66f46e2e2b0">10a2ba90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitInfo
* Rename InstalledPackageInfo into GenericUnitInfo
The name InstalledPackageInfo is only kept for alleged backward
compatibility reason in Cabal. ghc-boot has its own stripped down copy
of this datatype but it doesn't need to keep the name. Internally we
already use type aliases (UnitInfo in GHC, PackageCacheFormat in
ghc-pkg).
* Rename UnitInfo fields: add "unit" prefix and fix misleading names
* Add comments on every UnitInfo field
* Rename SourcePackageId into PackageId
"Package" already indicates that it's a "source package". Installed
package components are called units.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69562e34fb5d9571e9efc1cb90c879e50129a510">69562e34</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `emptyGenericUnitInfo`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e2c8e0e37a2709d5790d6c9a877a1463d6e88b5">9e2c8e0e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitInfo load/store from databases
Converting between UnitInfo stored in package databases and UnitInfo as
they are used in ghc-pkg and ghc was done in a very convoluted way (via
BinaryStringRep and DbUnitModuleRep type classes using fun deps, etc.).
It was difficult to understand and even more to modify (I wanted to
try to use a GADT for UnitId but fun deps got in the way).
The new code uses much more straightforward functions to convert between
the different representations. Much simpler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea717aa4248b2122e1f7550f30239b50ab560e4f">ea717aa4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factorize mungePackagePaths code
This patch factorizes the duplicated code used in ghc-pkg and in GHC to
munge package paths/urls.
It also fixes haddock-html munging in GHC (allowed to be either a file
or a url) to mimic ghc-pkg behavior.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10d15f1ec4bab4dd6152d87fc66e61658a705eb3">10d15f1e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring unit management code
Over the years the unit management code has been modified a lot to keep
up with changes in Cabal (e.g. support for several library components in
the same package), to integrate BackPack, etc. I found it very hard to
understand as the terminology wasn't consistent, was referring to past
concepts, etc.
The terminology is now explained as clearly as I could in the Note
"About Units" and the code is refactored to reflect it.
-------------------
Many names were misleading: UnitId is not an Id but could be a virtual
unit (an indefinite one instantiated on the fly), IndefUnitId
constructor may contain a definite instantiated unit, etc.
* Rename IndefUnitId into InstantiatedUnit
* Rename IndefModule into InstantiatedModule
* Rename UnitId type into Unit
* Rename IndefiniteUnitId constructor into VirtUnit
* Rename DefiniteUnitId constructor into RealUnit
* Rename packageConfigId into mkUnit
* Rename getPackageDetails into unsafeGetUnitInfo
* Rename InstalledUnitId into UnitId
Remove references to misleading ComponentId: a ComponentId is just an
indefinite unit-id to be instantiated.
* Rename ComponentId into IndefUnitId
* Rename ComponentDetails into UnitPprInfo
* Fix display of UnitPprInfo with empty version: this is now used for
units dynamically generated by BackPack
Generalize several types (Module, Unit, etc.) so that they can be used
with different unit identifier types: UnitKey, UnitId, Unit, etc.
* GenModule: Module, InstantiatedModule and InstalledModule are now
instances of this type
* Generalize DefUnitId, IndefUnitId, Unit, InstantiatedUnit,
PackageDatabase
Replace BackPack fake "hole" UnitId by a proper HoleUnit constructor.
Add basic support for UnitKey. They should be used more in the future to
avoid mixing them up with UnitId as we do now.
Add many comments.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bfb0219587b969d5c8f723c46d433e9493958b4">8bfb0219</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unit: split and rename modules
Introduce GHC.Unit.* hierarchy for everything concerning units, packages
and modules.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71484b09fa3c676e99785b3d68f69d4cfb14266e">71484b09</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow block arguments in arrow control operators
Arrow control operators have their own entries in the grammar, so they
did not cooperate with BlockArguments. This was just a minor oversight,
so this patch adjusts the grammar to add the desired behavior.
fixes #18050
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a48cd2a045695c5f34ed7b00184a8d91c4fcac0e">a48cd2a0</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow LambdaCase to be used as a command in proc notation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4d3773c7f4209cd3a0495ab9a29b978da48e2ff">f4d3773c</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document BlockArguments/LambdaCase support in arrow notation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bdfdd139e5aff57631e9f1c6654dc7b8590c63f">5bdfdd13</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T01:58:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #17873
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19b701c216246596710f0eba112ed5ee7b6bf870">19b701c2</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T07:30:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark rule args as non-tail-called
This was just an omission...b I'd failed to call markAllNonTailCall on
rule args. I think this bug has been here a long time, but it's quite
hard to trigger.
Fixes #18098
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/014ef4a3d9ee30b8add9118950f1f5007143bd1c">014ef4a3</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-04-30T07:30:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Improve tool-args command to support more components
There is a new command to hadrian, tool:path/to/file.hs, which returns
the options needed to compile that file in GHCi.
This is now used in the ghci script with argument `ghc/Main.hs` but its
main purpose is to support the new multi-component branch of ghcide.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/052f759319a08ba26007ac56d488f67016b2d8c6">052f7593</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-30T14:28:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up boot vs non-boot disambiguating types
We often have (ModuleName, Bool) or (Module, Bool) pairs for "extended"
module names (without or with a unit id) disambiguating boot and normal
modules. We think this is important enough across the compiler that it
deserves a new nominal product type. We do this with synnoyms and a
functor named with a `Gen` prefix, matching other newly created
definitions.
It was also requested that we keep custom `IsBoot` / `NotBoot` sum type.
So we have it too. This means changing many the many bools to use that
instead.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b34931e4eb0c6b6900a096d1199f12da14cf28ec">b34931e4</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-30T15:10:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch from HscSource to IsBootInterface for module lookup in GhcMake
We look up modules by their name, and not their contents. There is no
way to separately reference a signature vs regular module; you get what
you get. Only boot files can be referenced indepenently with `import {-#
SOURCE #-}`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/06e42de162b5679c1737dc2c8962526d401c627f">06e42de1</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-30T15:10:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">For -fkeep-failed do not duplicate dependency edge code
We now compute the deps for -fkeep-failed the same way that the original
graph calculates them, so the edges are correct. Upsweep really ought to
take the graph rather than a topological sort so we are never
recalculating anything, but at least things are done consistently now.
</pre>
</li>
</ul>
<h4>15 changed files:</h4>
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<li class="file-stats">
<a href="#03615ac1622815b67e9829de1c43ac90fa6d8068">
.ghcid
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<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
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.gitlab/linters/check-cpp.py
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.gitlab/merge_request_templates/merge-request.md
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CODEOWNERS
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<li class="file-stats">
<a href="#0c39c6a7c54e5d668d208665d6e5ccecdd3bb246">
HACKING.md
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<li class="file-stats">
<a href="#9ab3868b23ed5d5a6e12ef902049902556fa4009">
aclocal.m4
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<a href="#5c73b0c6f476ded38de389f894770f06f4d02b2f">
boot
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<a href="#d0d96a6d03668aeab20ebe05e2c4ccb798c7e64c">
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compiler/GHC.hs
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Builtin/Names.hs-boot
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</a>
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</ul>
<h5>The diff was not included because it is too large.</h5>
</div>
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