[GHC] #16216: readHexRational missing from Numeric

[GHC]

#16216: readHexRational missing from Numeric
-------------------------------------+-------------------------------------
        Reporter:  merijn            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by toonn):

 I've started
 [https://gitlab.haskell.org/ghc/ghc/merge_requests/268/pipelines work on
 this here]. I've tried to copy `readFloat` as closely as possible.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16216#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler