#13610: Unhelpful error messages about lifted and unlifted types -------------------------------------+------------------------------------- Reporter: nomeata | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.1 checker) | 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 nomeata): Ah, the problem is that `IO`’s type expects the second component of the tuple to be lifted, but `Weak#` is not. So the code is indeed bogus, but the error message is not very helpful. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13610#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler