#16059: checkValidType is defeated by a type synonym -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: upstream Priority: normal | Milestone: 8.10.1 Component: Compiler (Type | Version: 8.7 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC accepts | Unknown/Multiple invalid program | Test Case: Blocked By: | Blocking: 16140 Related Tickets: | Differential Rev(s): Wiki Page: | https://gitlab.haskell.org/ghc/ghc/merge_requests/112 -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: patch => upstream Comment: As noted in https://gitlab.haskell.org/ghc/ghc/merge_requests/112#note_2409, the MR I linked to above is failing to validate due to a sneaky use of impredicativity in `Cabal` that went unnoticed until this patch revealed it. I've opened a `Cabal` issue upstream [https://github.com/haskell/cabal/issues/5833 here]. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16059#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler