[GHC] #16216: readHexRational missing from Numeric

[GHC]

#16216: readHexRational missing from Numeric
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           Reporter:  merijn         |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  8.6.3
  libraries/base                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The HexFloatLiterals extension was merged as result of https://github.com
 /ghc-proposals/ghc-proposals/blob/master/proposals/0004-hexFloats.rst

 As part of this proposal `showHFloat` was added to Numeric to output
 floating points in hexFloat format, unfortunately, no one seems to have
 remembered to add `readHexRational` or a similar function to parse
 hexFloats to Numeric. This leads to the awkward scenario that I can easily
 produce hexFloat values, but have no way to parse them from
 `String`/`Text` data...

 All the code already exists in `compiler/util/Utils.hs`, someone just
 needs to cherry pick the implementation add add it to Numeric in base.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16216>
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