#8095: TypeFamilies painfully slow -------------------------------------+------------------------------------- Reporter: MikeIzbicki | Owner: goldfire Type: bug | Status: new Priority: high | Milestone: Component: Compiler (Type | Version: 7.6.3 checker) | Resolution: | Keywords: TypeFamilies Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #5321, #11598, | Differential Rev(s): Phab:D3752 #12506, #13386 | Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): According to my understanding, this should be reasonably straightforward: Introduce a placeholder `Coercion` variety which tracks the types, role, and free variables of the coercion. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8095#comment:49 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler