#1759: HPC interaction with -Wall leading to spurious pattern match warnings
-----------------------+----------------------------------------------------
Reporter: guest | Owner:
Type: bug | Status: new
Priority: low | Milestone:
Component: Compiler | Version: 6.8
Severity: normal | Keywords: HPC
Difficulty: Unknown | Os: Unknown
Testcase: | Architecture: Unknown
-----------------------+----------------------------------------------------
Without -fhpc, the following program passes the pattern match checker:
{{{
f :: String -> Int
f x | null x = 1
| otherwise = 2
main :: IO ()
main = print $ f []
}}}
However, with -fhpc on, we get the spurious warning:
{{{
A.hs:3:0:
Warning: Pattern match(es) are non-exhaustive
In the definition of `f': Patterns not matched: _
}}}
Causing libraries using -Werror to fail to build when using -fhpc.
}}}
-- Don
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1759>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
