#14273: Typed holes are oblivious to type class constraints -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.3 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Poor/confusing | Unknown/Multiple error message | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Replying to [comment:1 mpickering]:
Perhaps also the type of `pleaseShow` in the relevant bindings lacks the constraint on `a`?
Ah, right you are. The error states: {{{ • Relevant bindings include a :: a (bound at Bug.hs:3:17) pleaseShow :: Bool -> a -> Maybe String (bound at Bug.hs:2:1) }}} But that second binding really ought to be `pleaseShow :: Show a => Bool -> a -> Maybe String`, no? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14273#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler