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<h3>
 Marge Bot pushed to branch master
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/b31a3360e2ef12f3ec7eaf66b3600247c1eb36c3">b31a3360</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-29T00:32:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linear types: fix kind inference when checking datacons
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5830a12c46e7227c276a8a71213057595ee4fc04">5830a12c</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-29T00:32:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">New linear types syntax: a %p -> b (#18459)

Implements GHC Proposal #356

Updates the haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bca4d36dd835c1c31c8f3364113586e1aedc6787">bca4d36d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-29T00:32:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve error messages for (a %m) without LinearTypes

Detect when the user forgets to enable the LinearTypes
extension and produce a better error message.

Steals the (a %m) syntax from TypeOperators, the workaround
is to write (a % m) instead.
</pre>
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<h4>30 changed files:</h4>
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<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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compiler/GHC/Core/Multiplicity.hs
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compiler/GHC/Core/Opt/Arity.hs
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compiler/GHC/Core/Opt/Monad.hs
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compiler/GHC/Core/Opt/Simplify.hs
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compiler/GHC/Core/Opt/Simplify/Env.hs
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compiler/GHC/Core/SimpleOpt.hs
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compiler/GHC/Hs/Decls.hs
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compiler/GHC/Hs/Type.hs
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compiler/GHC/Parser.y
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compiler/GHC/Parser/Annotation.hs
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compiler/GHC/Types/Id/Make.hs
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testsuite/tests/linear/should_compile/LinearEmptyCase.hs
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testsuite/tests/linear/should_compile/OldList.hs
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testsuite/tests/linear/should_compile/Pr110.hs
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testsuite/tests/linear/should_compile/T18731.hs
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