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<h3>
Simon Peyton Jones pushed to branch wip/T16728
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/567894b49b9e8f5ced2d0e5f051f2a1d5c9f13e2">567894b4</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-06-07T08:36:32Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Disable darwin hadrian job
See #16771
We don't have enough capacity for the two jobs currently.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/d3915b304f297b8a2534f6abf9c2984837792921">d3915b30</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2019-06-07T14:20:42Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[skip ci] Improve the documentation of the CNF primops. In this context, the term "size" is ambiguous and is now avoided. Additionally, the distinction between a CNF and the blocks that comprise it has been emphasize. The vocabulary has been made more consistent with the vocabulary in the C source for CNF.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/e963beb54a243f011396942d2add644e3f3dd8ae">e963beb5</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2019-06-07T14:21:21Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TmOracle: Replace negative term equalities by refutable PmAltCons
The `PmExprEq` business was a huge hack and was at the same time vastly
too powerful and not powerful enough to encode negative term equalities,
i.e. facts of the form "forall y. x ≁ Just y".
This patch introduces the concept of 'refutable shapes': What matters
for the pattern match checker is being able to encode knowledge of the
kind "x can no longer be the literal 5". We encode this knowledge in a
`PmRefutEnv`, mapping a set of newly introduced `PmAltCon`s (which are
just `PmLit`s at the moment) to each variable denoting above
inequalities.
So, say we have `x ≁ 42 ∈ refuts` in the term oracle context and
try to solve an equality like `x ~ 42`. The entry in the refutable
environment will immediately lead to a contradiction.
This machinery renders the whole `PmExprEq` and `ComplexEq` business
unnecessary, getting rid of a lot of (mostly dead) code.
See the Note [Refutable shapes] in TmOracle for a place to start.
Metric Decrease:
T11195
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/0b7372f68c0bc9cafc30e227b574abf1d5b16df5">0b7372f6</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2019-06-07T14:21:57Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add HEAP_PROF_SAMPLE_END event to mark end of samples
This allows a user to observe how long a sampling period lasts so that
the time taken can be removed from the profiling output.
Fixes #16697
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/d1dc0ed75be0dafb0be3b4ff5e839612702eab47">d1dc0ed7</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2019-06-07T14:22:47Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16700: Tiny errors in output of GHCi commands :forward and :info
`:info Coercible` now outputs the correct section number of the GHCi User's guide together with the secion title.
`:forward x` gives the correct syntax hint.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/387050d0e26a9e6466b31c9d8e4e4f6273c64c9e">387050d0</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2019-06-07T14:23:23Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factor out 'getLibDir' / 'getBaseDir' into a new GHC.BaseDir ghc-boot module
ghc-pkg and ghc already both needed this. I figure it is better to
deduplicate, especially seeing that changes to one (FreeBSD CPP) didn't
make it to the other.
Additionally in !1090 I make ghc-pkg look up the settings file, which
makes it use the top dir a bit more widely. If that lands, any
difference in the way they find the top dir would be more noticable.
That change also means sharing more code between ghc and ghc-package
(namely the settings file parsing code), so I'd think it better to get
off the slipperly slope of duplicating code now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/da26ffe795f1861783c1b031ed93f9fa59550f85">da26ffe7</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-07T14:24:00Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve ShadowInfo when rewriting evidence
When the canonicaliser rewrites evidence of a Wanted, it
should preserve the ShadowInfo (ctev_nosh) field. That is,
a WDerive should rewrite to WDerive, and WOnly to WOnly.
Previously we were unconditionally making a WDeriv, thereby
rewriting WOnly to WDeriv. This bit Nick Frisby (issue #16735)
in the context of his plugin, but we don't have a compact test
case.
The fix is simple, but does involve a bit more plumbing,
to pass the old ShadowInfo around, to use when building
the new Wanted.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/9bb58799d2ce58f6aef772df79ad26210403aded">9bb58799</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-07T14:24:38Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Delete target symlink in createFileLinkUntracked
Previously createFileLinkUntracked would fail if the symlink already
existed.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/be63d2996308c77f8a0a44592074c98f66a80e93">be63d299</a></strong>
<div>
<span>by Simon Jakobi</span>
<i>at 2019-06-07T14:25:16Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix isValidNatural: The BigNat in NatJ# must have at least 2 limbs
Previously the `integer-gmp` variant of `isValidNatural` would fail to
detect values `<= maxBound::Word` that were incorrectly encoded using
the `NatJ#` constructor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/e87b9f8731460a7d8c0b45507be2d83935683d56">e87b9f87</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2019-06-07T14:26:04Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">llvm-targets: Add x86_64 android layout
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/60db142ba2928f159a0df6fd2a7c1839addf6206">60db142b</a></strong>
<div>
<span>by code5hot</span>
<i>at 2019-06-07T14:26:46Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Traversable.hs with a note about an intuitive law</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/f11aca52b1ea47b0e3c43c1ee7a5ec8c6d061714">f11aca52</a></strong>
<div>
<span>by code5hot</span>
<i>at 2019-06-07T14:26:46Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Used terminology from a paper. Added it as a reference.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/13b3d45d308108da2d92b3c06b5489f41703e623">13b3d45d</a></strong>
<div>
<span>by code5hot</span>
<i>at 2019-06-07T14:26:46Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">remove backticks from markup - it doesn't mean what I think it means</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/cfd3e0f1cfd16c8f35cae139d2a871a32eb4d2e1">cfd3e0f1</a></strong>
<div>
<span>by Zejun Wu</span>
<i>at 2019-06-07T14:27:34Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pass preprocessor options to C compiler when building foreign C files (#16737)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/5991d877a3da69da63ab93ea277bd89965c97573">5991d877</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-07T14:28:09Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Export Finalizers
As requested in #16750.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/3d97bad67ea64b7ee690c0a8836579bceef47cb5">3d97bad6</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-06-07T14:28:47Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: use deb9 Docker images instead of deb8 for CI jobs
This should fix #16739, where we seem to be getting extra carets in
a test's output because of the gcc that ships with the deb8 image,
whule we're not observing those extra carets in the deb9-based (Make)
jobs.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/1afb499583f741a95cceb3207c5455c8ec6f5b87">1afb4995</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-07T14:29:23Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Create index.html in documentation deployment
Otherwise navigating to https://ghc.gitlab.haskell.org/ghc will result
in a 404.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/c70ea23d2840a2454fbffb4f03328e6f1ccaefe2">c70ea23d</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-07T18:16:58Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix two places that failed the substitution invariant
The substition invariant relies on keeping the in-scope
set in sync, and we weren't always doing so, which means that
a DEBUG compiler crashes sometimes with an assertion failure
This patch fixes a couple more cases. Still not validate
clean (with -DEEBUG) but closer!
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/18e22a12db3278c71fedcff68251401ca6c672e5">18e22a12</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-07T18:16:58Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typechecking of partial type signatures
Partial type sigs had grown hair. tcHsParialSigType was
doing lots of unnecessary work, and tcInstSig was cloning it
unnecessarily -- and the result didn't even work: #16728.
This patch cleans it all up, described by TcHsType
Note [Checking parital type signatures]
I basically just deleted code... but very carefully!
Some refactoring along the way
* Distinguish more explicintly between "anonymous" wildcards "_"
and "named" wildcards "_a". I changed the names of a number
of functions to make this distinction much more apparent.
The patch also revealed that the code in `TcExpr`
that implements the special typing rule for `($)` was wrong.
It called `getRuntimeRep` in a situation where where was no
particular reason to suppose that the thing had kind `TYPE r`.
This caused a crash in typecheck/should_run/T10846.
The fix was easy, and actually simplifies the code in `TcExpr`
quite a bit. Hooray.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
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<a href="#49d2d51d42e9c209de33c35681b9c9b1e912cda9">
compiler/basicTypes/NameEnv.hs
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<a href="#bd37d71fa68b0980d832d992b427fd6a6bdb891d">
compiler/deSugar/Check.hs
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<a href="#cdd7bc06da6b3eab3e2072ece6294a7f54808f28">
compiler/deSugar/DsMonad.hs
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<a href="#7589abbc710cc40f6e48245c2bc16d69f556b714">
compiler/deSugar/PmExpr.hs
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<a href="#584407121afc66978c814dbdb5c252118d27656a">
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compiler/deSugar/PmPpr.hs
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<a href="#379674a5063221cec43f0f659c2eb67b30339f45">
compiler/deSugar/TmOracle.hs
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<a href="#0f33fd88c617246c7f89c4477d2d1d24f942df23">
compiler/ghc.cabal.in
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compiler/main/DriverPipeline.hs
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<a href="#0dbf0ff37c38cb6a955d609ea292c495d5978739">
compiler/main/SysTools/BaseDir.hs
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compiler/prelude/PrelInfo.hs
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compiler/prelude/primops.txt.pp
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compiler/rename/RnTypes.hs
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compiler/typecheck/Inst.hs
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compiler/typecheck/TcBinds.hs
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compiler/typecheck/TcCanonical.hs
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compiler/typecheck/TcEvidence.hs
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compiler/typecheck/TcExpr.hs
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compiler/typecheck/TcHsType.hs
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compiler/typecheck/TcMType.hs
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compiler/typecheck/TcRnDriver.hs
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compiler/typecheck/TcRnMonad.hs
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compiler/typecheck/TcRnTypes.hs
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compiler/typecheck/TcSMonad.hs
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compiler/typecheck/TcSigs.hs
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compiler/typecheck/TcType.hs
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compiler/types/Type.hs
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compiler/utils/ListSetOps.hs
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<a href="#28cb2d1fcbc22664fcf251f87743f25d05fcd16f">
docs/users_guide/eventlog-formats.rst
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ghc/GHCi/UI.hs
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