[GHC] #8714: ExistentialQuantification plus DeriveDataTypeable leads to core lint error

[GHC]

#8714: ExistentialQuantification plus DeriveDataTypeable leads to core lint error
-------------------------------------+----------------------------------
        Reporter:  CoreyOConnor      |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
-------------------------------------+----------------------------------

Comment (by CoreyOConnor):

 The lint error no longer shows up if the strictness annotation is removed
 form hlCache of FBufferData.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8714#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler