#5858: type inference of an OverloadedString for a class instance with type
parameters
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Reporter: GregWeber | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by GregWeber):
Thanks, your suggestion did fix the inference. Here is a small test
program
{{{
{-# LANGUAGE FlexibleInstances, GADTs #-}
module InferOverloaded where
class InferOverloaded a where
infer :: a -> String
-- instance (t1 ~ String, t2 ~ String) => InferOverloaded (t1,t2) where
instance (t1 ~ String) => InferOverloaded (t1,t1) where
infer = show . fst
foo = infer ([],[])
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5858#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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