#8776: Displaying pattern synonym for a GADT -------------------------------------+------------------------------------ Reporter: monoidal | Owner: cactus Type: bug | Status: merge Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by cactus): I've wasted too much time trying to get it to work... While the general idea is sound, there's one tiny problem that unfortunately breaks the whole thing: `IfaceType`'s `ppr_ty` has no way of splitting an `IfaceType` into a theta and a tau, because `isIfacePredTy` is stubbed out: {{{ isIfacePredTy :: IfaceType -> Bool isIfacePredTy _ = False -- FIXME: fix this to print iface pred tys correctly -- isIfacePredTy ty = isConstraintKind (ifaceTypeKind ty) }}} and there's no obvious way to implement `ifaceTypeKind` either... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8776#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler