[GHC] #14121: ghc master requires -XTypeInType where 8.2.1 does not

[GHC]

#14121: ghc master requires -XTypeInType where 8.2.1 does not
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        Reporter:  duog              |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.3
  checker)                           |
      Resolution:  invalid           |             Keywords:
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:                    |
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Comment (by bgamari):

 If nothing else we should mention it in the migration guide. See
 [[Migration/8.4]].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14121#comment:4>
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