#14845: TypeInType, index GADT by constraint witness -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.5 Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #13895 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Actually, come to think of it, the check I suggested around `dataConFullSig` will snag user-written equality constraints, which it shouldn't. For example {{{ data G a where MkG :: a ~ Int => G a }}} should be just fine to promote. So something more delicate will be needed. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14845#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler