#7164: Confusing "not a (visible) method" warning when method name clashes with
another definition
-----------------------------------------------+----------------------------
Reporter: joeyadams | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.6.1-rc1 | Keywords:
Os: Unknown/Multiple | Architecture:
Unknown/Multiple
Failure: Incorrect warning at compile-time | Testcase:
Blockedby: | Blocking:
Related: |
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Given this code:
{{{
class Foo m where
herp :: (a -> a) -> m b -> m b
derp :: m a
derp :: Int
derp = 123
}}}
GHC 7.4.1, 7.4.2, and 7.6.0.20120810 (rc1) produce the following output:
{{{
not-visible-method.hs:3:5:
`derp' is not a (visible) method of class `Foo'
not-visible-method.hs:6:1:
Multiple declarations of `derp'
Declared at: not-visible-method.hs:3:5
not-visible-method.hs:6:1
}}}
The second error makes sense, but the first one is bogus. I'm defining
class `Foo`! If I remove the clashing `derp`, the module compiles.
GHC 7.0.3 and 7.2.2 produce the correct output.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7164>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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