#7543: Constraint synonym instances -----------------------------+---------------------------------------------- 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: -----------------------------+---------------------------------------------- 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 _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs