#11693: Add `When` type family -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: feature | Status: new request | Priority: normal | Milestone: Component: Core | Version: 8.1 Libraries | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Does a type family like `When` from [https://github.com/mikeizbicki/subhask/blob/master/src/SubHask/SubType.hs#L1... here] belong somewhere in `Data.Types.*` {{{#!hs type family When (a :: Bool) (b :: Constraint) :: Constraint where When True b = b When False b = () }}} like [https://hackage.haskell.org/package/base/docs/Control- Monad.html#v:when when]. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11693 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler