#5455: strange behaviour of -fwarn-incomplete-uni-patterns
--------------------------------+-------------------------------------------
Reporter: MikolajKonarski | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.3 | Keywords:
Testcase: | Blockedby:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect warning at
compile-time
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For the following program (attached):
{{{
module Pat where
w :: String
w = let (_:_) = ["1", "2", "3"] in "1"
w2 :: String
w2 = let (_a:_b) = ["1", "2", "3"] in "1"
}}}
the following warnings are generated (note line numbers)
{{{
mikolaj@bratek:~/waste$ ghc --make pat.hs -fwarn-incomplete-uni-patterns
[1 of 1] Compiling Patwhere ( pat.hs, pat.o )
pat.hs:7:10:
Warning: Pattern match(es) are non-exhaustive
In a pattern binding: Patterns not matched: []
pat.hs:7:10:
Warning: Pattern match(es) are non-exhaustive
In a pattern binding: Patterns not matched: []
mikolaj@bratek:~/waste$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.3.20110808
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5455>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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