#3822: guards in arrow notation (Arrows extension) case statement cause compiler
panic
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Reporter: StephenBlackheath | Owner: ross
Type: bug | Status: new
Priority: normal | Milestone: 6.12.2
Component: Compiler | Version: 6.12.1
Keywords: arrows guards case panic | Difficulty:
Os: Unknown/Multiple | Testcase: patternGuard.hs
Architecture: Unknown/Multiple | Failure: Compile-time crash
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Comment(by ross):
Replying to [comment:7 simonpj]:
> Ross: can you see what is wrong? Core Lint gives the error below after
desugaring:
Yes, variables occurring only in guards are not being recognized as being
used, so they're discarded from the pipeline before reaching the case.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3822#comment:8>
GHC <http://www.haskell.org/ghc/>
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