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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/a506e942dc1cc825be23daa8ad48f295bf1ca5fb">a506e942</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-13T02:58:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Rework `ArityType` to fix monotonicity (#18870)
As we found out in #18870, `andArityType` is not monotone, with
potentially severe consequences for termination of fixed-point
iteration. That showed in an abundance of "Exciting arity" DEBUG
messages that are emitted whenever we do more than one step in
fixed-point iteration.
The solution necessitates also recording `OneShotInfo` info for
`ABot` arity type. Thus we get the following definition for `ArityType`:
```
data ArityType = AT [OneShotInfo] Divergence
```
The majority of changes in this patch are the result of refactoring use
sites of `ArityType` to match the new definition.
The regression test `T18870` asserts that we indeed don't emit any DEBUG
output anymore for a function where we previously would have.
Similarly, there's a regression test `T18937` for #18937, which we
expect to be broken for now.
Fixes #18870.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/31f9cf0cdf0a098da1e55922992e12f2e38eab5f">31f9cf0c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-11-13T02:58:37-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Emit "Exciting arity" warning only after second iteration (#18937)
See Note [Exciting arity] why we emit the warning at all and why we only
do after the second iteration now.
Fixes #18937.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/439a42186aa9519d0d9314b44fb5b39c6289753b">439a4218</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-13T02:58:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move Plugins into HscEnv (#17957)
Loaded plugins have nothing to do in DynFlags so this patch moves them
into HscEnv (session state).
"DynFlags plugins" become "Driver plugins" to still be able to register
static plugins.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/acde8d07becc2c38ee5afd53cd8b7210a794d41b">acde8d07</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-11-13T02:58:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't initialize plugins in the Core2Core pipeline
Some plugins can be added via TH (cf addCorePlugin). Initialize them in
the driver instead of in the Core2Core pipeline.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/55f1b984703094ba9409effb96d9d7b0358010f8">55f1b984</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-11-13T02:58:39-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Cache cabal store in linting job
</pre>
</li>
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compiler/GHC.hs
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compiler/GHC/Core/Opt/Arity.hs
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compiler/GHC/Core/Opt/Pipeline.hs
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compiler/GHC/Core/Opt/Simplify.hs
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compiler/GHC/Driver/Main.hs
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compiler/GHC/Driver/Monad.hs
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testsuite/tests/arityanal/should_compile/T18870.hs
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