[GHC] #12931: tc_infer_args does not set in-scope set correctly

[GHC]

#12931: tc_infer_args does not set in-scope set correctly
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        Reporter:  johnleo           |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12549 #11371     |  Differential Rev(s):
  #12785                             |
       Wiki Page:                    |
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Changes (by simonpj):

 * keywords:   => TypeInType


Comment:

 Richard, may be you can look at this in due course?  `tc_infer_args` is
 (uncomfortably) a mystery to me.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12931#comment:1>
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