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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/ede241268171e8eee1e750d88ff356ddbfc357f2">ede24126</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-05-27T00:13:55-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">core-spec: Modify file paths according to new module hierarchy
This patch updates file paths according to new module hierarchy [1]:
* GHC/Core.hs <= coreSyn/CoreSyn.hs
* GHC/Core/Coercion.hs <= types/Coercion.hs
* GHC/Core/Coercion/Axiom.hs <= types/CoAxiom.hs
* GHC/Core/Coercion/Opt.hs <= types/OptCoercion.hs
* GHC/Core/DataCon.hs <= basicTypes/DataCon.hs
* GHC/Core/FamInstEnv.hs <= types/FamInstEnv.hs
* GHC/Core/Lint.hs <= coreSyn/CoreLint.hs
* GHC/Core/Subst.hs <= coreSyn/CoreSubst.hs
* GHC/Core/TyCo/Rep.hs <= types/TyCoRep.hs
* GHC/Core/TyCon.hs <= types/TyCon.hs
* GHC/Core/Type.hs <= types/Type.hs
* GHC/Core/Unify.hs <= types/Unify.hs
* GHC/Types/Literal.hs <= basicTypes/Literal.hs
* GHC/Types/Var.hs <= basicTypes/Var.hs
[1]: https://gitlab.haskell.org/ghc/ghc/-/wikis/Make-GHC-codebase-more-modular
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04750304deae2128a8350e28224e1f62ae949820">04750304</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T00:14:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">eventlog: Fix racy flushing
Previously no attempt was made to avoid multiple threads writing their
capability-local eventlog buffers to the eventlog writer simultaneously.
This could result in multiple eventlog streams being interleaved. Fix
this by documenting that the EventLogWriter's write() and flush()
functions may be called reentrantly and fix the default writer to
protect its FILE* by a mutex.
Fixes #18210.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d6203f24cf421749616a247c047a9b44192f963a">d6203f24</a></strong>
<div>
<span>by Joshua Price</span>
<i>at 2020-05-27T00:15:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make `identifier` parse unparenthesized `->` (#18060)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f7338dd8fb3e69dd324464a3480039a98efb0c31">f7338dd8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T18:32:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Core.Unfold: Refactor traceInline
This reduces duplication as well as fixes a bug wherein -dinlining-check
would override -ddump-inlinings. Moreover, the new variant
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c422a8ba668de5a45e115835c06719012b7041a">2c422a8b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T18:32:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Avoid unnecessary allocations due to tracing utilities
While ticky-profiling the typechecker I noticed that hundreds of
millions of SDocs are being allocated just in case -ddump-*-trace is
enabled. This is awful.
We avoid this by ensuring that the dump flag check is inlined into the
call site, ensuring that the tracing document needn't be allocated
unless it's actually needed.
See Note [INLINE conditional tracing utilities] for details.
Fixes #18168.
Metric Decrease:
T9961
haddock.Cabal
haddock.base
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/836bd05783e496ac0de51ed7d1f6da59409685ce">836bd057</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-05-27T18:32:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Semigroup/Monoid for Q (#18123)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f5b09a1bb0dbfe00940519c94a6697f24e8991f">3f5b09a1</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-05-27T18:32:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18071
Run the core linter on candidate instances to ensure they are
well-kinded.
Better handle quantified constraints by using a CtWanted to avoid
having unsolved constraints thrown away at the end by the solver.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/87a87ad917785f9bd1fb5d2d11ffc8275aa636f2">87a87ad9</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-27T18:32:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">FloatOut: Only eta-expand dead-end RHS if arity will increase (#18231)
Otherwise we risk turning trivial RHS into non-trivial RHS, introducing
unnecessary bindings in the next Simplifier run, resulting in more
churn.
Fixes #18231.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/993c66a6130473bd234f597b8c1de49a022c9328">993c66a6</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-27T18:32:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DmdAnal: Recognise precise exceptions from case alternatives (#18086)
Consider
```hs
m :: IO ()
m = do
putStrLn "foo"
error "bar"
```
`m` (from #18086) always throws a (precise or imprecise) exception or
diverges. Yet demand analysis infers `<L,A>` as demand signature instead
of `<L,A>x` for it.
That's because the demand analyser sees `putStrLn` occuring in a case
scrutinee and decides that it has to `deferAfterPreciseException`,
because `putStrLn` throws a precise exception on some control flow
paths. This will mask the `botDiv` `Divergence`of the single case alt
containing `error` to `topDiv`. Since `putStrLn` has `topDiv` itself,
the final `Divergence` is `topDiv`.
This is easily fixed: `deferAfterPreciseException` works by `lub`ing
with the demand type of a virtual case branch denoting the precise
exceptional control flow. We used `nopDmdType` before, but we can be
more precise and use `exnDmdType`, which is `nopDmdType` with `exnDiv`.
Now the `Divergence` from the case alt will degrade `botDiv` to `exnDiv`
instead of `topDiv`, which combines with the result from the scrutinee
to `exnDiv`, and all is well.
Fixes #18086.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b6c76ea9673fb4eba6ef0d8ed2d55a2be086ab88">b6c76ea9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T18:32:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ticky-ticky: Record DataCon name in ticker name
This makes it significantly easier to spot the nature of
allocations regressions and comes at a reasonably low cost.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/752f9d0286de1dffda39325249b653d0f21b8b53">752f9d02</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T18:32:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't track GHC's verbosity argument
Teach hadrian to ignore GHC's -v argument in its recompilation check,
thus fixing #18131.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de24f09226e05e5d8fbfea12bc7edd7513b368e6">de24f092</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-27T18:32:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rip out CmmStackInfo(updfr_space)
As noted in #18232, this field is currently completely unused and
moreover doesn't have a clear meaning.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#f73a4fa90a8eb153bccdcfcc9f63c15edcd66785">
compiler/GHC/Cmm.hs
</a>
</li>
<li class="file-stats">
<a href="#066085df29cc928ac539d8feae6e5215cbbf1e14">
compiler/GHC/Cmm/LayoutStack.hs
</a>
</li>
<li class="file-stats">
<a href="#bbf4b351b327473b112c1d212f720f929c5ce247">
compiler/GHC/Cmm/Ppr.hs
</a>
</li>
<li class="file-stats">
<a href="#29a1593e7281c8a9103a19e3a7562e2365e23b47">
compiler/GHC/Cmm/ProcPoint.hs
</a>
</li>
<li class="file-stats">
<a href="#0debbb6150cac3b9f1027e430021269925103bb9">
compiler/GHC/Core/Opt/FloatOut.hs
</a>
</li>
<li class="file-stats">
<a href="#cc763cdd1967f5d921161a32f64136cfcf0332c5">
compiler/GHC/Core/Opt/SetLevels.hs
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<li class="file-stats">
<a href="#37879a759bc2ca5cc8f1f35235fe96e3e55b57c9">
compiler/GHC/Core/Opt/Simplify/Monad.hs
</a>
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<li class="file-stats">
<a href="#2811a7297b8aa206197ac1f5dabd0818e3c7ec5a">
compiler/GHC/Core/Unfold.hs
</a>
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<li class="file-stats">
<a href="#8d8e5922fde8bc19ffa2bc9cae6b6720abb88564">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
</a>
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<li class="file-stats">
<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
</a>
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<li class="file-stats">
<a href="#173c7eb846a4e9b5fee79688a72cbf6a326e4e1e">
compiler/GHC/Runtime/Eval.hs
</a>
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<li class="file-stats">
<a href="#2f341f858154eb8e1900d5bd92a156b13ddd06f3">
compiler/GHC/StgToCmm/Bind.hs
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<li class="file-stats">
<a href="#f117e9b1b1b9964c4d89aa403162f1c388114cda">
compiler/GHC/StgToCmm/Monad.hs
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<li class="file-stats">
<a href="#b62375d0938c2cf6d00a6bec9649e795e57a9683">
compiler/GHC/StgToCmm/Ticky.hs
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<li class="file-stats">
<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#c6e4263ee64c68e57b7525127d98243fce38b1ea">
compiler/GHC/Tc/Utils/Monad.hs
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<li class="file-stats">
<a href="#d09e98aae6ad2eb59d08eac7894b68c0ab820cda">
compiler/GHC/Types/Demand.hs
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<li class="file-stats">
<a href="#74503129756c368c70bd530fb0beb4292889db5e">
compiler/GHC/Utils/Error.hs
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<li class="file-stats">
<a href="#f740374ad9d1ce333c9d2992b2feda632e24371f">
docs/core-spec/CoreLint.ott
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<li class="file-stats">
<a href="#560a2a2363bd7c0d01f90fdb07e153565ada8556">
docs/core-spec/CoreSyn.ott
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<li class="file-stats">
<a href="#a088d80ab8c32a211cb927ba7d489370cd5eb4fe">
docs/core-spec/README
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<li class="file-stats">
<a href="#7dc5395d86b92c5a2b05aa2e9c13c1635f051da8">
docs/core-spec/core-spec.mng
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<li class="file-stats">
<a href="#992e7eb1bd13e4d31f52ca068190ea73dba7e829">
docs/core-spec/core-spec.pdf
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<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<li class="file-stats">
<a href="#ab592100ed82c8a311237d6f24c5de0d0f5297a4">
hadrian/src/Target.hs
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<li class="file-stats">
<a href="#a1d25ba13887eca47ad71301d419574bea4696a0">
includes/rts/EventLogWriter.h
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<li class="file-stats">
<a href="#ed3c6537b674490396f9cab5cbb014ee54e71168">
libraries/template-haskell/Language/Haskell/TH/Syntax.hs
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<li class="file-stats">
<a href="#ee61d093f9c845475278836990fdde8877a1de02">
libraries/template-haskell/changelog.md
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<li class="file-stats">
<a href="#c3e03f58006993eb453b46fb32b8425e5d10f2f3">
rts/eventlog/EventLogWriter.c
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<h5>The diff was not included because it is too large.</h5>
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