[GHC] #7220: Confusing error message in type checking related to type family, fundep, and higher-rank type

[GHC]

#7220: Confusing error message in type checking related to type family, fundep,
and higher-rank type
-------------------------------------+-------------------------------------
              Reporter:  tsuyoshi    |            Owner:  simonpj
                  Type:  bug         |           Status:  closed
              Priority:  normal      |        Milestone:  7.8.1
             Component:  Compiler    |          Version:  7.6.1-rc1
  (Type checker)                     |         Keywords:
            Resolution:  fixed       |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
  typecheck/should_fail/T7220        |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"7b1a8562d9b92547251d0dff23bb3a2de25d4b6f/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="7b1a8562d9b92547251d0dff23bb3a2de25d4b6f"
 Fix up tests for Trac #7220; the old test really was ambiguous
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7220#comment:5>
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