[GHC] #15392: Inconsistency in parsing trailing commas inside import section

[GHC]

#15392: Inconsistency in parsing trailing commas inside import section
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        Reporter:  chshersh          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
  (Parser)                           |             Keywords:
      Resolution:                    |  imports,trailing,commas
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 nomeata):

 Not a bug, unfortunately, but behavious as specified in the report:
 https://www.haskell.org/onlinereport/haskell2010/haskellch5.html#x11-1000005.2

 There is a language extensions proposal underway that would fix this, but
 it now does much more stuff:
 https://github.com/ghc-proposals/ghc-proposals/pull/87

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15392#comment:3>
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