#12119: Can't create injective type family equation with TypeError as the RHS -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: feature request | Status: closed Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Keywords: Resolution: wontfix | CustomTypeErrors, TypeFamilies, | InjectiveFamilies Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by sheaf): * cc: sheaf (added) Comment: I understand that the type family is injective if I remove the type error. However I would prefer a custom error message, as opposed to the user getting some confusing error about stuck type families. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12119#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler