[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)                           |
      Resolution:                    |             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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Comment (by adamgundry):

 No, I hadn't considered the interaction with unboxed tuple syntax. It is a
 bit awkward, but the lexical syntax is sufficiently crowded that I doubt
 we will be able to do better, and we already have similar annoyances
 involving `.hsc` files. I suppose we could add a sentence to the manual
 pointing out the conflict and encouraging a style in which overloaded
 labels are preceded by a space (even when in parentheses).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12459#comment:5>
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