[GHC] #11384: Error says to fix incorrect return type

[GHC]

#11384: Error says to fix incorrect return type
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:  GADTs
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:  8258              |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * failure:  None/Unknown => Incorrect warning at compile-time
 * version:  8.1 => 7.6.3
 * blockedby:   => 8258


Comment:

 Good idea.

 #8258 would help with the first suggestion (enabling `GADTs`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11384#comment:1>
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