#11693: Add `When` type family -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Core Libraries | Version: 8.1 Resolution: | Keywords: 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 ekmett): This strikes me as the kind of thing that belongs out in a user library like `constraints` or `subhask` as it requires a fair bit of machinery to use well, and suffers the sort of type-level "boolean blindness" that indicates it'd often need to be reimplemented subtly differently. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11693#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler