#15954: LiberalTypeSynonyms unsaturation check doesn't kick in -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: patch 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): Phab:D5402 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): PS. Here's an idea. In `check_syn_tc_app`, you could wrap the recursive call to `check_type` in `addErrCtxt "In the expansion of type synonym <blah>`. That would give us the best of both worlds, including for the trickier case I described in comment:5 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15954#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler