#14048: Data instances of kind Constraint -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #12369 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): I'm a little uncomfortable that this requires two declarations of the name: the `data family Sing :: ...` and the `class Sing ...`. More broadly, I think the code might be easier to read using two different names, frankly. But maybe others disagree. I don't see any major problems with adding it -- it's just a question of programmability (and maintenance burden). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14048#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler