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<h3>
Marge Bot pushed to branch wip/marge_bot_batch_merge_job
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/3359d23cf92f10468beb089d4720a4e0a1de6b22">3359d23c</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2019-05-03T13:20:06Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Typeset Big-O complexities with Tex-style notation (#16090)
Use `\min` instead of `min` to typeset it as an operator.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/ff3c808aba3b6d0b1d68a6355f85e74c08baab96">ff3c808a</a></strong>
<div>
<span>by Shayne Fletcher</span>
<i>at 2019-05-03T13:20:08Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make Extension derive Bounded
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/ddf32ba13faaea758715d983c0d5e21c69c5a217">ddf32ba1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-05-03T13:20:09Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark concprog001 as fragile
Due to #16604.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/465b6d858d28e227f80ae3a32e532d58e008d5e5">465b6d85</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2019-05-03T13:20:11Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: generate JUnit testsuite report in Linux CI job
We also keep it as an artifact, like we do for non-Hadrian jobs, and list it
as a junit report, so that the test results are reported in the GitLab UI for
merge requests.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/4add6f5d8e2caef3f698ed029e9da94c10c18aed">4add6f5d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2019-05-03T13:20:11Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pattern/expression ambiguity resolution
This patch removes 'EWildPat', 'EAsPat', 'EViewPat', and 'ELazyPat'
from 'HsExpr' by using the ambiguity resolution system introduced
earlier for the command/expression ambiguity.
Problem: there are places in the grammar where we do not know whether we
are parsing an expression or a pattern, for example:
do { Con a b <- x } -- 'Con a b' is a pattern
do { Con a b } -- 'Con a b' is an expression
Until we encounter binding syntax (<-) we don't know whether to parse
'Con a b' as an expression or a pattern.
The old solution was to parse as HsExpr always, and rejig later:
checkPattern :: LHsExpr GhcPs -> P (LPat GhcPs)
This meant polluting 'HsExpr' with pattern-related constructors. In
other words, limitations of the parser were affecting the AST, and all
other code (the renamer, the typechecker) had to deal with these extra
constructors.
We fix this abstraction leak by parsing into an overloaded
representation:
class DisambECP b where ...
newtype ECP = ECP { runECP_PV :: forall b. DisambECP b => PV (Located b) }
See Note [Ambiguous syntactic categories] for details.
Now the intricacies of parsing have no effect on the hsSyn AST when it
comes to the expression/pattern ambiguity.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/7544ac6bbe57d4898301eb8f155f8b1f3951808f">7544ac6b</a></strong>
<div>
<span>by Ningning Xie</span>
<i>at 2019-05-03T13:20:12Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Only skip decls with CUSKs with PolyKinds on (fix #16609)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/edb0ef760e58c3b2f1d2d83a5249a1f929988718">edb0ef76</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2019-05-03T13:20:16Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix interface version number printing in --show-iface
Before
Version: Wanted [8, 0, 9, 0, 2, 0, 1, 9, 0, 4, 2, 5],
got [8, 0, 9, 0, 2, 0, 1, 9, 0, 4, 2, 5]
After
Version: Wanted 809020190425,
got 809020190425
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/328db43379533ee1ac0fa55dac94cf3eee6748e7">328db433</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-05-03T13:20:21Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make equality constraints in kinds invisible
Issues #12102 and #15872 revealed something strange about the way GHC
handles equality constraints in kinds: it treats them as _visible_
arguments! This causes a litany of strange effects, from strange
error messages
(https://gitlab.haskell.org/ghc/ghc/issues/12102#note_169035)
to bizarre `Eq#`-related things leaking through to GHCi output, even
without any special flags enabled.
This patch is an attempt to contain some of this strangeness.
In particular:
* In `TcHsType.etaExpandAlgTyCon`, we propagate through the
`AnonArgFlag`s of any `Anon` binders. Previously, we were always
hard-coding them to `VisArg`, which meant that invisible binders
(like those whose kinds were equality constraint) would mistakenly
get flagged as visible.
* In `ToIface.toIfaceAppArgsX`, we previously assumed that the
argument to a `FunTy` always corresponding to a `Required`
argument. We now dispatch on the `FunTy`'s `AnonArgFlag` and map
`VisArg` to `Required` and `InvisArg` to `Inferred`. As a
consequence, the iface pretty-printer correctly recognizes that
equality coercions are inferred arguments, and as a result,
only displays them in `-fprint-explicit-kinds` is enabled.
* Speaking of iface pretty-printing, `Anon InvisArg` binders were
previously being pretty-printed like `T (a :: b ~ c)`, as if they
were required. This seemed inconsistent with other invisible
arguments (that are printed like `T @{d}`), so I decided to switch
this to `T @{a :: b ~ c}`.
Along the way, I also cleaned up a minor inaccuracy in the users'
guide section for constraints in kinds that was spotted in
https://gitlab.haskell.org/ghc/ghc/issues/12102#note_136220.
Fixes #12102 and #15872.
</pre>
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<h4>30 changed files:</h4>
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<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
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<a href="#4cebcede53127700de963abffccad9d336d74889">
compiler/deSugar/DsExpr.hs
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<a href="#7f924eb82ea52b493e50fc467c301adb6a0eaf32">
compiler/hieFile/HieAst.hs
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<a href="#cd87eb0344087ad60213d14d7abe8bf5ed82b93f">
compiler/hsSyn/HsExpr.hs
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<a href="#3ec3774412294d7ceaaa0572f116dc7c911d3f6d">
compiler/hsSyn/HsExtension.hs
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<a href="#bd128e1d11b59e2626269e806a4b49fc751a0f9d">
compiler/iface/BinIface.hs
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<a href="#00cc4cf327870c80c12809fcd939c8b3ad54c12b">
compiler/iface/IfaceType.hs
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<a href="#2119acd0d77cb9a80015bd3299a85327f09c9cd6">
compiler/iface/ToIface.hs
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<a href="#092e98c57072740713901cf146f61fc634f8a065">
compiler/parser/Lexer.x
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<a href="#a9d23eb447426d7f3469127262985af461dfad78">
compiler/parser/Parser.y
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<a href="#f68eb03961d8e370e8d3f41bd51ea01fd168779e">
compiler/parser/RdrHsSyn.hs
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<a href="#f39c3af3fb50116eacfc5f437ab61dbe27ab59ac">
compiler/rename/RnExpr.hs
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<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
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<a href="#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
compiler/typecheck/TcRnTypes.hs
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<a href="#bdfa0cc139f61d1236abc1598c5d684b43c357f9">
compiler/typecheck/TcTyClsDecls.hs
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<a href="#02ab52057b25cd107220549e7027dd4c9a6ba32c">
compiler/types/TyCon.hs
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<a href="#40d93f06cdb95d1c98a6b3832d0153e59839d832">
docs/users_guide/glasgow_exts.rst
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<a href="#5fbb1164b5c674e4253da7e91b14facf09746bbd">
libraries/base/Data/OldList.hs
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<a href="#acecd3813d90e82d1b376f7d6b9171838680d185">
libraries/base/GHC/List.hs
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<a href="#3f7d85c388596f9ef50f1a3e0334bdb67007e969">
libraries/ghc-boot-th/GHC/LanguageExtensions/Type.hs
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<a href="#63c4ca170779aa86ceb6667030e03d20e30c5ea3">
testsuite/tests/concurrent/prog001/all.T
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testsuite/tests/ghci/scripts/T15872.hs
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testsuite/tests/ghci/scripts/T15872.script
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testsuite/tests/ghci/scripts/all.T
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<a href="#e8f7c9332028bfa8080629e1ed0fcb2cddb94ee5">
testsuite/tests/parser/should_fail/InfixAppPatErr.stderr
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testsuite/tests/parser/should_fail/T984.stderr
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<a href="#3577fc796b73fe1f96c77f05fcdd73a8d4bc6f66">
testsuite/tests/parser/should_fail/all.T
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testsuite/tests/parser/should_fail/cmdFail001.hs
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