#16116: Explicit foralls in associated type family equations are oblivious to class-bound variables -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Actually this check -- that variables on the RHS are bound on the LHS -- is performed by `TcValidity.checkFamPatBinders`. So I think it can simply be deleted here. It's hard to do correctly because of the implicit kind binders etc. Can you try simply deleting it? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16116#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler