#7007: Fixity declaration reported as ambiguous
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Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.2
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Christopher Dove reports: So I have some module, in a work project that
I'm portnig from GHC
6.12.3 to GHC 7.4.2,
{{{
module Data.Monoid.Operator where
import Data.Monoid
(++) :: Monoid a => a -> a -> a
(++) = mappend
infixr 5 ++
}}}
This compiles happily on GHC 6.12.3, but on 7.4.2 says:
{{{
src/Data/Monoid/Operator.hs:9:10:
Ambiguous occurrence `++'
It could refer to either `Data.Monoid.Operator.++',
defined at src/Data/Monoid/Operator.hs:8:1
or `Prelude.++',
imported from `Prelude' at
src/Data/Monoid/Operator.hs:3:8-27
(and originally defined in `GHC.Base')
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7007>
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