#8477: Allow inferring ambiguous types -------------------------------------+------------------------------------ Reporter: aavogt | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: 8390 -------------------------------------+------------------------------------ Comment (by simonpj): Like I say, I'm doubtful about allowing functions to get ambiguous ''inferred'' types, because that plants hidden land mines for those who call the function. If you give a signature, you are explicitly asking for this particular land mine. If you want it to have an ambiguous type, say so! It's like a per-declaration pragma, if you like. It would not be impossible to make `-XAllowAmbiguousTypes` work for inferred types, but actually it would not be entirely straightforward; see `Note [Impedence matching]` in `TcBinds`. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8477#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler