[GHC] #9833: GHCi suggestion for instance signature (InstanceSigs) is wrong

[GHC]

#9833: GHCi suggestion for instance signature (InstanceSigs) is wrong
-------------------------------------+-------------------------------------
              Reporter:              |            Owner:
  Iceland_jack                       |           Status:  closed
                  Type:  bug         |        Milestone:
              Priority:  normal      |          Version:  7.8.2
             Component:  GHCi        |         Keywords:
            Resolution:  fixed       |     Architecture:  Unknown/Multiple
      Operating System:  Linux       |       Difficulty:  Unknown
       Type of failure:  GHC         |       Blocked By:
  rejects valid program              |  Related Tickets:
             Test Case:              |
  polykinds/T9833                    |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * status:  new => closed
 * testcase:   => polykinds/T9833
 * resolution:   => fixed


Comment:

 Thanks for pointing this out.  The original issue was that the `empty`
 method was ''more'' polymorphic than required.  That is now legal.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9833#comment:2>
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