[GHC] #12665: Make Read instances for Integral types faster, and make them fail fast (was: Make Read instances faster, and make them fail fast)

[GHC]

#12665: Make Read instances for Integral types faster, and make them fail fast
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        Reporter:  dfeuer            |                Owner:  dfeuer
            Type:  feature request   |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by YitzGale):

 Sorry, I was confused by a parallel conversation on the mailing list about
 parsers for Float and Double. Now I see that this ticket is only about
 Integral types. Perhaps the title of this ticket should be changed to make
 that clear.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12665#comment:17>
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