[GHC] #14473: Implement Underscores in Numeric Literals Proposal (NumericUnderscores extension)

[GHC]

#14473: Implement Underscores in Numeric Literals Proposal (NumericUnderscores
extension)
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           Reporter:  takenobu       |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:  #13126 #9224
Differential Rev(s):                 |         Wiki Page:
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 Implement Underscores in Numeric Literals Proposal.

 GHC supports various numeric literals such as decimal, octal, hexadecimal,
 binary, and floating point numbers. However, large numeric literals are
 hard to read. This proposal improves the readability, quality,
 expressiveness of numeric literals.

 This proposal allows underscores to numeric literals when the
 `NumericUnderscores` language extension is enabled.
 Underscores (`_`) in numeric literals are simply ignored.

 The specification of the feature is available here:\\
 ​https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0009
 -numeric-underscores.rst

 For a discussion:\\
 https://github.com/ghc-proposals/ghc-proposals/pull/76

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14473>
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