#2033: GHC-6.9 panics rather than parse error, related to view patterns.
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Reporter: apeacock | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.9
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: x86 | Os: Windows
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Try to compile the below program, ghc panics rather than giving a parse
error (in the program I was trying to write, wrapper's argument should be
a lambda function).
main = do
wrapper (_ -> putStrLn "_")
wrapper :: (String -> IO ()) -> IO ()
wrapper f = f ""
Output:
[1 of 1] Compiling Main ( Test.hs, interpreted )
: panic! (the 'impossible' happened)
(GHC version 6.9.20071111 for i386-unknown-mingw32):
rnExpr: unexpected expression: panic! (the 'impossible' happened)
(GHC version 6.9.20071111 for i386-unknown-mingw32):
hsSyn/HsExpr.lhs:(320,0)-(467,72): Non-exhaustive patterns in
functi
pr_expr
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2033>
GHC <http://www.haskell.org/ghc/>
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