[GHC] #9627: Type error with functional dependencies

[GHC]

#9627: Type error with functional dependencies
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       Reporter:  augustss           |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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 The attached file should compile.  The types T1, T2, and T3 are all
 equivalent types (T1 and T2 normalize to T3), but with foo::T1 and bar::T2
 there is a type error.

 Rewriting the example using type families instead of FD makes it work.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9627>
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