#1213: typecheck/TcTyClsDecls.lhs: Non-exhaustive patterns in function tcConDecl
-------------------------+--------------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.6
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: Unknown | Os: Unknown
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The following code
{{{
module Main where
newtype Test where
T :: Int -> Test
instance Show Test where
show (T i) = show i
main = putStrLn (show (T 3))
}}}
causes the compiler to crash with:
{{{
[1 of 1] Compiling Main ( test2.hs, test2.o )
ghc-6.6: panic! (the 'impossible' happened)
(GHC version 6.6 for powerpc-apple-darwin):
typecheck/TcTyClsDecls.lhs:(468,0)-(524,4): Non-exhaustive
patterns in function tcConDecl
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
however changing 'newtype' to 'data' compiles without errors.
Tested with GHC and GHCi 6.6 under Mac OS X 10.4.8 running on an iMac G5.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1213>
GHC <http://www.haskell.org/ghc/>
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