[GHC] #8450: can't match type Bool with (), but shouldn't have to

[GHC]

#8450: can't match type Bool with (), but shouldn't have to
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        Reporter:  dmwit             |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 I hit this problem or something very very close to it, earlier this week.
 Though in my case it was for type correct code that i had to hoist out as
 a top level definition to type check.. I'll see if i can repro it in a
 smaller example.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8450#comment:1>
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