#6018: Injective type families -------------------------------------+------------------------------------- Reporter: lunaris | Owner: jstolarek Type: feature | Status: new request | Milestone: 7.10.1 Priority: normal | Version: 7.4.1 Component: Compiler | Keywords: TypeFamilies, Resolution: | Injective Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: #4259 Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by goldfire): Simon's (very straightforward) example clarifies this in my mind -- I agree about just heading for plain old injectivity for open type families. If/when we want more involved reasoning for closed type families, where inference is possible, we can address that. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/6018#comment:59 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler