[GHC] #11671: Allow labels starting with uppercase with OverloadedLabels

[GHC]

#11671: Allow labels starting with uppercase with OverloadedLabels
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        Reporter:  inaki             |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1-rc1
  (Parser)                           |
      Resolution:                    |             Keywords:  ORF
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 echatav):

 I also have a use case for labels starting with uppercase letters. It
 would be extremely helpful for supporting PostgreSQL enum types which are
 compatible with Haskell enum types in Squeal
 (https://hackage.haskell.org/package/squeal-postgresql).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11671#comment:16>
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