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<h3>
Ben Gamari pushed to branch ghc-9.0
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/b936c542a24a9d082c684b83fa715a655faf1f42">b936c542</a></strong>
<div>
<span>by MaxGabriel</span>
<i>at 2020-10-12T14:19:41+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document -Wderiving-typeable
Tracking: #18641
(cherry picked from commit 73d2521688bd1da4b6bd1202e5325a00cb410a44)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c073a4ab5dbd4d3cc31a2ea1491f2166621c8e79">c073a4ab</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-10-12T14:20:47+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove the list of loaded modules from the ghci prompt
(cherry picked from commit 086ef01813069fad84cafe81cab37527d41c8568)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aff164bc30694dd20ba9ab0b51249f24804a1e89">aff164bc</a></strong>
<div>
<span>by Benjamin Maurer</span>
<i>at 2020-10-12T14:21:51+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Workaround for #18623: GHC crashes bc. under rlimit for vmem it will reserve
_all_ of it, leaving nothing for, e.g., thread stacks.
Fix will only allocate 2/3rds and check whether remainder is at least large
enough for minimum amount of thread stacks.
(cherry picked from commit 74c797f6b72c4d01f5e0092dfac1461f3f3dd7a2)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/447798994126db7d5fe47be5dc3f3a6796208edb">44779899</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-12T14:22:35+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a flag to indicate that gcc supports -no-pie
Fixes #17919.
(cherry picked from commit e48cab2a57f2342891f985bcb44817e17e985275)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ba4468755774e3a694317bb7263a879c29b1f43e">ba446875</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-12T14:23:25+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix linear types in TH splices (#18465)
(cherry picked from commit 802b5e6fdd6dfc58396a9dca1903dc5a1d6634ca)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b10154d6ca41525622607ff44514339f32114bf7">b10154d6</a></strong>
<div>
<span>by Icelandjack</span>
<i>at 2020-10-12T14:25:47+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Replaced MkT1 with T1 in type signatures.
(cherry picked from commit b81350bb925f8cb309355ee46238dbc11b796faf)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/baa5536960f3a3d3afc0d258df3b8af43d4de917">baa55369</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-12T14:26:12+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix quantification in GADTs (#18790)
(cherry picked from commit 22f218b729a751bc5e5965624a716fc542f502a5)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/146cff70b3a0ba4678ce9924670b1f8424b8f631">146cff70</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-12T14:27:02+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Preserve as-parsed arrow type for HsUnrestrictedArrow
When linear types are disabled, HsUnrestrictedArrow is treated as
HslinearArrow.
Move this adjustment into the type checking phase, so that the parsed
source accurately represents the source as parsed.
Closes #18791
(cherry picked from commit d6dff830754a97220eacf032c32cd54b18654917)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8c370e118138c5447e60db4ce5ef57fd9cc4f06b">8c370e11</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-10-12T14:27:30+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ApiAnnotations : preserve parens in GADTs
A cleanup in 7f418acf61e accidentally discarded some parens in
ConDeclGADT.
Make sure these stay in the AST in a usable format.
Also ensure the AnnLolly does not get lost in a GADT.
(cherry picked from commit 36787bba78ae5acbb857c84b85b8feb7c83e54a5)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15c4eb1f774c15d653358e9dcae1e55791c4bbfd">15c4eb1f</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-12T14:28:15+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix roles in GADTs (#18799)
(cherry picked from commit 8fafb304cacae69f8dbbdcf22ab858a5b28b6818)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a740aa0bfca7053f1e7688553d6118ca536b004e">a740aa0b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-12T15:10:13+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: match on small Integer/Natural
Previously we only matched on *variables* whose unfoldings were a ConApp
of the form `IS lit#` or `NS lit##`. But we forgot to match on the
ConApp directly... As a consequence, constant folding only worked after
the FloatOut pass which creates bindings for most sub-expressions. With
this patch, matching on bignums works even with -O0 (see bignumMatch
test).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d09e7e41cf79fe981a61eae46a93d8881859ff1f">d09e7e41</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-12T15:10:30+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: fix bigNatCompareWord# bug (#18813)
(cherry picked from commit 74ee1237bf243dd7d8b758a53695575c364c3088)
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#11ffe98a94d798427bc600e4fcfe899407536346">
compiler/GHC/Core/SimpleOpt.hs
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<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
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<a href="#bf951467d4a9aa443cb109cb4c84a2891945649b">
compiler/GHC/Parser.y
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<a href="#b1092d2df4ded3655524830252278016d6aa5afd">
compiler/GHC/Parser/Annotation.hs
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compiler/GHC/Parser/Lexer.x
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<a href="#446cb12ca6cefaf1c6eb79b7db643632744263c7">
compiler/GHC/Parser/PostProcess.hs
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<a href="#892acbb198a9095c917740d3c1297b56df4e3b7e">
compiler/GHC/Rename/HsType.hs
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<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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compiler/GHC/Tc/Gen/Splice.hs
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<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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compiler/GHC/Tc/TyCl/Utils.hs
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<a href="#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6">
docs/users_guide/expected-undocumented-flags.txt
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docs/users_guide/exts/linear_types.rst
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docs/users_guide/ghci.rst
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docs/users_guide/phases.rst
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docs/users_guide/using-warnings.rst
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ghc/GHCi/UI.hs
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libraries/ghc-bignum/src/GHC/Num/BigNat.hs
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<a href="#34aaedc89b793629cde66c63c1842ee679f621af">
rts/posix/OSMem.c
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<a href="#d0624eb2a076bdbe3f842da55a5579e29c6cabe2">
testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr
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testsuite/tests/lib/integer/all.T
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testsuite/tests/linear/should_compile/MultConstructor.hs
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