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<h3>
Sebastian Graf pushed to branch wip/T18478
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/750a1595ef31cdc335f3bab045b2f19a9c43ff93">750a1595</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-18T07:26:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add --copying-gc flag to reverse effect of --nonmoving-gc
Fixes #18281.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6ba6a881c58459008f02fb4816f8dec2800c2b73">6ba6a881</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-18T07:26:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement `fullCompilerVersion`
Follow-up of https://gitlab.haskell.org/ghc/ghc/-/issues/18403
This MR adds `fullCompilerVersion`, a function that shares the same
backend as the `--numeric-version` GHC flag, exposing a full,
three-digit version datatype.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e6cf27dfded59fe42bd6be323573c0d576e6204a">e6cf27df</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a Lint hadrian rule and an .hlint.yaml file in base/
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcb177dd00c91d825e00ed228bce6cfeb7684bf7">bcb177dd</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow multiple case branches to have a higher rank type
As #18412 points out, it should be OK for multiple case alternatives
to have a higher rank type, provided they are all the same.
This patch implements that change. It sweeps away
GHC.Tc.Gen.Match.tauifyMultipleBranches, and friends, replacing it
with an enhanced version of fillInferResult.
The basic change to fillInferResult is to permit the case in which
another case alternative has already filled in the result; and in
that case simply unify. It's very simple actually.
See the new Note [fillInferResult] in TcMType
Other refactoring:
- Move all the InferResult code to one place, in GHC.Tc.Utils.TcMType
(previously some of it was in Unify)
- Move tcInstType and friends from TcMType to Instantiate, where it
more properly belongs. (TCMType was getting very long.)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5525a51900623e04ec914e9dcc7f4ad1fd3b528">e5525a51</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve typechecking of NPlusK patterns
This patch (due to Richard Eisenberg) improves
documentation of the wrapper returned by tcSubMult
(see Note [Wrapper returned from tcSubMult] in
GHC.Tc.Utils.Unify).
And, more substantially, it cleans up the multiplicity
handling in the typechecking of NPlusKPat
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/12f9035200424ec8104484f154a040d612fee99d">12f90352</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-18T07:26:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove {-# CORE #-} pragma (part of #18048)
This pragma has no effect since 2011.
It was introduced for External Core, which no longer exists.
Updates haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e504c9137dff2b8f51e8ed96b5cbb5a0d19f8e3a">e504c913</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-07-18T07:26:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor the simplification of join binders
This MR (for #18449) refactors the Simplifier's treatment
of join-point binders.
Specifically, it puts together, into
GHC.Core.Opt.Simplify.Env.adjustJoinPointType
two currently-separate ways in which we adjust the type of
a join point. As the comment says:
-- (adjustJoinPointType mult new_res_ty join_id) does two things:
--
-- 1. Set the return type of the join_id to new_res_ty
-- See Note [Return type for join points]
--
-- 2. Adjust the multiplicity of arrows in join_id's type, as
-- directed by 'mult'. See Note [Scaling join point arguments]
I think this actually fixes a latent bug, by ensuring that the
seIdSubst and seInScope have the right multiplicity on the type
of join points.
I did some tidying up while I was at it. No more
setJoinResTy, or modifyJoinResTy: instead it's done locally in
Simplify.Env.adjustJoinPointType
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/49b265f08c7ac9c9dea6cfff0d67447728b7b416">49b265f0</a></strong>
<div>
<span>by Chaitanya Koparkar</span>
<i>at 2020-07-18T07:26:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix minor typos in a Core.hs note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8d59aed6e9f494d6eae41c5ba32cde23cecaeb14">8d59aed6</a></strong>
<div>
<span>by Stefan Schulze Frielinghaus</span>
<i>at 2020-07-18T07:26:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHCi: Fix isLittleEndian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c26e81d116a653b5259aeb290fb1e697efe3382a">c26e81d1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-18T07:26:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Mark ghci tests as fragile under unreg compiler
In particular I have seen T16012 fail repeatedly under the
unregisterised compiler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/868e452340ade3155dd7e552c16bbb3c21c42b8a">868e4523</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "AArch32 symbols only on aarch32."
This reverts commit cdfeb3f24f76e8fd30452016676e56fbc827789a.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c915ba84f4ec8c4f0f006bd6aa938d17936dcd93">c915ba84</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "Fix (1)"
This reverts commit 7abffced01f5680efafe44f6be2733eab321b039.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/777c452a83ebdb2b50f3f328255a6f36ae49f398">777c452a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "better if guards."
This reverts commit 3f60b94de1f460ca3f689152860b108a19ce193e.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0dd405529f0f17cd9a5b299e7ae5539a885b4b5a">0dd40552</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-07-20T04:30:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Revert "[linker/rtsSymbols] More linker symbols"
This reverts commit 686e72253aed3880268dd6858eadd8c320f09e97.
Signed-off-by: Moritz Angermann <moritz.angermann@gmail.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af5dd3e15364cede906b316159edc5c9341321cf">af5dd3e1</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-07-21T08:52:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression test for #18478
!3392 backported !2993 to GHC 8.10.2 which most probably is responsible
for fixing #18478, which triggered a pattern match checker performance
regression in GHC 8.10.1 as first observed in #17977.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#182d6a315e784018aa9c8b2ad736036b97bd5d48">
compiler/GHC/Core.hs
</a>
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<li class="file-stats">
<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<li class="file-stats">
<a href="#f168a93cde5e2aec2441d6331dfe500172df4af3">
compiler/GHC/Core/Opt/Simplify.hs
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<li class="file-stats">
<a href="#2f46b19cb85e3f7b4e72305644bc50015628c41d">
compiler/GHC/Core/Opt/Simplify/Env.hs
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<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<a href="#f157d5c316465070f94641e4c9ab0248311588cd">
compiler/GHC/Core/UsageEnv.hs
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<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
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<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<a href="#3c19c0be465f9a28d7b69f89c55648080fcc37eb">
compiler/GHC/HsToCore/Quote.hs
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<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
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<a href="#a1ae0a1be35c859d90b0756920a7198075fb91e1">
compiler/GHC/Parser/Lexer.x
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<a href="#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2">
compiler/GHC/Rename/Expr.hs
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<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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<a href="#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">
compiler/GHC/Tc/Gen/Match.hs
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<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.hs
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<a href="#eade747fa0a15693c67617629e286714fce958e4">
compiler/GHC/Tc/Gen/Sig.hs
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<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">
compiler/GHC/Tc/Instance/Class.hs
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<a href="#07389a8f0516c26409d86f6bb651ed00759b5d4c">
compiler/GHC/Tc/Instance/Family.hs
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<a href="#dd8bbe6a21866e4f574f4796b7ad19de17564072">
compiler/GHC/Tc/TyCl/Class.hs
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<a href="#46e7b59eca287d43c19d0d8902b41f5d04f0d268">
compiler/GHC/Tc/Types/Evidence.hs
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<a href="#f021c52a6ccf306e88c9f760b2aee33b180ba341">
compiler/GHC/Tc/Utils/Env.hs
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<a href="#59d42d45d27a766c3ef299d73c226697153b7f6e">
compiler/GHC/Tc/Utils/Instantiate.hs
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<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<a href="#12f1226bde7e9f48203d34d8d857513f2f1f4d75">
docs/users_guide/phases.rst
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<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<li class="file-stats">
<a href="#2eeb40f0acd6cb433ebe65e34262040b618908a7">
hadrian/hadrian.cabal
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<h5>The diff was not included because it is too large.</h5>
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