[GHC] #14938: Pattern matching on GADT does not refine type family parameters

[GHC]

#14938: Pattern matching on GADT does not refine type family parameters
-------------------------------------+-------------------------------------
        Reporter:  kcsongor          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.2.2
  checker)                           |             Keywords:  GADTs,
      Resolution:                    |  TypeFamilies, TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by Iceland_jack):

 * cc: Iceland_jack (added)


-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14938#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler