[GHC] #14863: QuantifiedConstraints: Can't deduce `c' from `(a, b)' and `a |- b |- c'

[GHC]

#14863: QuantifiedConstraints: Can't deduce `c' from `(a, b)' and `a |- b |- c'
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.5
      Resolution:                    |             Keywords:
                                     |  QuantifiedConstraints wipT2893
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Iceland_jack):

 With the [https://ghc.haskell.org/trac/ghc/ticket/2893#comment:34 latest
 changes] `uncurryC2` works. Should this be closed?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14863#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler