#13251: Must perform family consistency check on non-imported identifiers -------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: TypeFamilies Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): This plan sounds generally good. Nitpick:
Less obviously, the use of a wired-in `TyCon` to deal with built-in syntax (e.g. overloaded lists) may add a new instance provider that was not (transitively) imported. A particular case is `GHC.Exts`.
The things involved in overloaded lists are `fromListN` and the `IsList` type class, both of which are known-key things, not wired-in. (The built- in list type is not the issue here.) Then "Tracking instance providers" needs to include this case as well. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13251#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler