#14266: AllowAmbiguousTypes doesn't play well with default class methods -------------------------------------+------------------------------------- Reporter: chris-martin | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Its nothing to do with `AllowAmbiguousTypes`, except that the latter is needed to allow you to write the signature at all. What I wrote all happens after the signature is accepted.
because DefaultSignatures emits code that doesn't use any instance signatures, right
I don't understand that. Your example made essential use of instance signatures. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14266#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler