#11067: Spurious superclass cycle error with type equalities -------------------------------------+------------------------------------- Reporter: oerjan | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 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 oerjan): András Kovács [https://github.com/ekmett/constraints/issues/11#issuecomment-154726144 found a workaround] for our use case: The error disappears if `Forall` etc. are made type synonym families rather than plain synonyms. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11067#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler