[GHC] #4921: report ambiguous type variables more consistently

[GHC]

#4921: report ambiguous type variables more consistently
-------------------------------------+-------------------------------------
              Reporter:  Saizan      |            Owner:
                  Type:  feature     |           Status:  closed
  request                            |        Milestone:  7.10.1
              Priority:  low         |          Version:  7.0.1
             Component:  Compiler    |         Keywords:
  (Type checker)                     |     Architecture:  Unknown/Multiple
            Resolution:  fixed       |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
  typecheck/should_fail/T4921        |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => closed
 * testcase:   => typecheck/should_fail/T4921
 * resolution:   => fixed


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4921#comment:7>
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