[GHC] #12459: UnboxedTuple makes overloaded labels fail to parse

[GHC]

#12459: UnboxedTuple makes overloaded labels fail to parse
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           Reporter:  Iceland_jack   |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
  (Parser)                           |
           Keywords:  orf            |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  GHC rejects
  Unknown/Multiple                   |  valid program
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 [https://gist.githubusercontent.com/PkmX/bfb2c5af4317c96282795f8c588fda1c/raw/4e388fae1b87e16dc215613531e54b036736b34c/NamedTuple.hs
 This] works (removing spaces)

 {{{#!hs
 -- user = ( #login := "themoritz", #id := 3522732 )

 user :: User
 user = (#login := "themoritz", #id := 3522732)
 }}}

 but it doesn't when `UnboxedTuples` are enabled:

 {{{#!hs
 -- tWKw.hs:63:46: error: parse error on input ‘)’
 user = (#login := "themoritz", #id := 3522732)
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12459>
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