What do you expect to happen here? We just don't have unboxed ints at
#14180: Strange/bad error message binding unboxed type variable -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.2.2 Component: Compiler (Type | Version: 8.3 checker) | Resolution: | Keywords: TypeInType 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 dfeuer): Replying to [comment:2 simonpj]: the type level. Doubtless the error message could be improved. Well, a message to that effect would be much better than what we get now! But I don't have a sufficiently clear sense of exactly what is and is not allowed to write it myself. Something about variables bound in type families not being able to have kinds of kind `TYPE r` unless `r ~ PtrRepLifted`, perhaps? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14180#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler