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<h3>
Sebastian Graf pushed to branch wip/pmcheck-release-notes-8.12
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7e9689f6fcc3eb974f0a76ae8078abda30026d">4c7e9689</a></strong>
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<span>by Sebastian Graf</span>
<i>at 2020-06-11T10:37:38+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Release Notes: Add news from the pattern-match checker [skip ci]
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<h4>1 changed file:</h4>
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<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<h4>Changes:</h4>
<li id="b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4c7e9689f6fcc3eb974f0a76ae8078abda30026d#b421960e854c6cfa1e4ca830bd6a5fc6eef91168"><strong>docs/users_guide/8.12.1-notes.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -19,6 +19,19 @@ Highlights</td>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> In the mean this improved runtime by about 0.8%. For details</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> see ticket :ghc-ticket:`17823`.</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext">* Pattern-Match Coverage Checking</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> - The revamp of the pattern-match coverage checker that started in 8.10 concludes with this release and implements the </span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> novel `*Lower Your Guards* <https://www.microsoft.com/en-us/research/uploads/prod/2020/03/lyg.pdf>`_ algorithm.</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> - Compared to 8.10, end users might notice improvements to "long-distance information": :: haskell</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> :linenos: </span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> f True = 1</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> f x = ... case x of { False -> 2; True -> 3 } ...</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> GHC is now able to detect the case alt returning 3 as redundant.</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> - Some more performance improvements in edge cases.</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">Full details</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">------------</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"></span>
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