#15144: Type inference regression between GHC 8.0.2 and 8.2.2 -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler (Type | Version: 8.2.2 checker) | Resolution: | Keywords: TypeFamilies 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 RyanGlScott): What's odd is that things work out alright if I write an explicit type signature: {{{#!hs g :: Coercible (F a) b => Proxy a -> F a -> b g p x = f p x }}} It's only when the type is inferred that it becomes less general. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15144#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler