#13401: GHCi gives conflicting information about visible type application -------------------------------------+------------------------------------- Reporter: crockeea | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.0.1 Resolution: | Keywords: | TypeApplications Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11376, #11975 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): I agree with Ryan's explanations. `:type expr` gives you the type that would be assigned to `x` if you say `let x = expr`. `:type +v expr` gives you the type of `expr`. One challenge here is that `foo` ''does'' have type `forall {k}. k`. It also has type `forall k. k`. It also has type `Int`. One challenge in a type system like Haskell's is that an expression has many types. All this said, I do agree with @crockeea's suggestions to clarify the documentation. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13401#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler