#12057: TypeFamilyDependencies on GHC.Generic's `Rep` -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: libraries/base | Version: 8.0.1 Resolution: | Keywords: TypeFamilies, | Injective Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): `Rep` definitely isn't injective. Counterexample: `Rep (Proxy Int)` = `Rep (Proxy Char)`, but `Int` is not `Char`. `Not` can certainly be made injective though, and this would be simple to do and useful. Would you care to make a patch for it? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12057#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler