#12526: regression in type inference with respect to type families -------------------------------------+------------------------------------- Reporter: Lemming | Owner: Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: 10634 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * milestone: 8.0.2 => 8.2.1 Comment: I am in the middle of an upheaval of the constraint solver that fixes this among other things. But the change is too big to put in the 8.0.2 branch. So I suggest we re-milestone for 8.2, and treat this as something to work- around with 8.0.2. The workaround is simple, as comment:11 says: a type signature seems to do the job. I think it's a fluke that it worked before. Is that acceptable? I think it'll be hard to fix in 8.0.2. Yell if that'd be really bad for you. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12526#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler