[GHC] #15252: syn_arg_wraps and syn_res_wrap are only populated after typechecking

[GHC]

#15252: syn_arg_wraps and syn_res_wrap are only populated after typechecking
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        Reporter:  mpickering        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by alanz):

 I am pretty sure I tried to do this on two different occasions without
 success, then left it as an after the fact cleanup.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15252#comment:2>
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