[GHC] #10067: The Read Integer instance is too slow

[GHC]

#10067: The Read Integer instance is too slow
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        Reporter:  redneb            |                   Owner:
            Type:  feature request   |                  Status:  patch
        Priority:  low               |               Milestone:
       Component:  Core Libraries    |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D645
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Comment (by ekmett):

 I'm pretty sure we'd be willing to bend over backwards to avoid adding
 another import cycle, given all that we've done over the course of 7.10 to
 break the previous ones up. ;)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10067#comment:7>
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