#4439: GHC doesn't detect trivial complete pattern with the combination of
ExistentialQuantification and ViewPatterns
---------------------------------+------------------------------------------
Reporter: batterseapower | Owner:
Type: bug | Status: merge
Priority: normal | Milestone:
Component: Compiler | Version: 6.12.3
Keywords: | Testcase: deSugar/should_compile/T4439
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Incorrect warning at
compile-time
---------------------------------+------------------------------------------
Changes (by simonpj):
* status: new => merge
* testcase: => deSugar/should_compile/T4439
Comment:
Good point! Fixed by
{{{
Tue Oct 26 00:04:05 PDT 2010 [email protected]
* Make isIrrefutableHsPat say True for existentials; fixes Trac #4439
At last. A bug that is really easy to fix.
M ./compiler/hsSyn/HsPat.lhs -1 +4
}}}
Please merge
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4439#comment:1>
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