#13092: family instance consistency checks are too pessimistic -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: rwbarton Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): I managed to break type family consistency in 8.0.1 using `ghc -c` alone, but apparently it was in some way that fooled the recompilation checker and it can't be reproduced from a clean build. So I don't know how I did it. In any case, it seems more logical for the type family instances in `A` to be checked against `B` while compiling `A`, rather than forcing every importer of `A` to do it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13092#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler