[GHC] #10625: Spurious unused quantified type variable warning with ExistentialQuantification

[GHC]

#10625: Spurious unused quantified type variable warning with
ExistentialQuantification
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.10.1
  checker)                           |             Keywords:
      Resolution:  fixed             |  ExistentialQuantification
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect         |            Test Case:
  warning at compile-time            |  rename/should_compile/T10625
      Blocked By:                    |             Blocking:
 Related Tickets:  #5331             |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * testcase:   => rename/should_compile/T10625


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10625#comment:4>
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