[GHC] #9479: Report required constraints when reporting the type of a hole

[GHC]

#9479: Report required constraints when reporting the type of a hole
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              Reporter:              |            Owner:
  dominiquedevriese                  |           Status:  new
                  Type:  feature     |        Milestone:
  request                            |          Version:  7.8.3
              Priority:  low         |         Keywords:  holes
             Component:  Compiler    |     Architecture:  Unknown/Multiple
  (Type checker)                     |       Difficulty:  Unknown
            Resolution:              |       Blocked By:
      Operating System:              |  Related Tickets:
  Unknown/Multiple                   |
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by dominiquedevriese):

 Note: this report was triggered by the following StackOverflow question:

 http://stackoverflow.com/questions/23028124/is-there-a-way-to-make-ghc-
 provide-the-type-class-constraints-of-typed-holes

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9479#comment:1>
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