#7543: Constraint synonym instances
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Reporter: monoidal | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.6.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Blockedby:
Blocking: | Related:
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It would be great if GHC could compile:
{{{
{-# LANGUAGE ConstraintKinds #-}
type Ring = Num
instance Ring [a] where
(+) = (++)
}}}
Currently this gives an error: `(+)` is not a visible method of class
`Ring`. After removing the last line, the code compiles with warnings
about missing methods.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7543>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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