diff options
| author | Sebastian Graf <sebastian.graf@kit.edu> | 2020-06-11 10:34:45 +0200 |
|---|---|---|
| committer | Sebastian Graf <sebastian.graf@kit.edu> | 2020-06-11 10:37:38 +0200 |
| commit | 4c7e9689f6fcc3eb974f0a76ae8078abda30026d (patch) | |
| tree | 0eff14b091126e030aab8d7ade50c95b0aea7447 | |
| parent | 8d07c48ce3fde32a3c08c84764e0859b84eee461 (diff) | |
| download | haskell-wip/pmcheck-release-notes-8.12.tar.gz | |
Release Notes: Add news from the pattern-match checker [skip ci]wip/pmcheck-release-notes-8.12
| -rw-r--r-- | docs/users_guide/8.12.1-notes.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/docs/users_guide/8.12.1-notes.rst b/docs/users_guide/8.12.1-notes.rst index 22b9e0b571..bc8450417f 100644 --- a/docs/users_guide/8.12.1-notes.rst +++ b/docs/users_guide/8.12.1-notes.rst @@ -19,6 +19,19 @@ Highlights In the mean this improved runtime by about 0.8%. For details see ticket :ghc-ticket:`17823`. +* Pattern-Match Coverage Checking + + - The revamp of the pattern-match coverage checker that started in 8.10 concludes with this release and implements the + novel `*Lower Your Guards* <https://www.microsoft.com/en-us/research/uploads/prod/2020/03/lyg.pdf>`_ algorithm. + - Compared to 8.10, end users might notice improvements to "long-distance information": :: haskell + + :linenos: + f True = 1 + f x = ... case x of { False -> 2; True -> 3 } ... + + GHC is now able to detect the case alt returning 3 as redundant. + - Some more performance improvements in edge cases. + Full details ------------ |