[GHC] #12918: Make DefaultSignatures more particular about their types on the RHS of a context

[GHC]

#12918: Make DefaultSignatures more particular about their types on the RHS of a
context
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  simonpj
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.0.2-rc1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12784            |  Differential Rev(s):  Phab:D2983
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => patch
 * differential:   => Phab:D2983


Comment:

 Simon, I've uploaded a first shot of this at Phab:D2983. I would greatly
 appreciate some feedback on how to fix the remaining issues.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12918#comment:6>
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