#15954: LiberalTypeSynonyms unsaturation check doesn't kick in -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler (Type | Version: 8.6.2 checker) | Resolution: | Keywords: 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 simonpj):
I suppose the prudent thing to do here would be to conjure up variations of tcSplitForAllVarBndrs and tcSplitPhiTy that don't expand type synonyms?
Actually I think it would suffice simply to put this `check_type` equation (the one you cite in comment:2) last, after the one for `TyConApp`. The latter does the right thing for synonyms, and expands them. Oh, the `FunTy` case should still follow the moved equation; consider `t1 => t2`. Would you like to try that? Thanks! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15954#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler