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

[GHC]

#10067: The Read Integer instance is too slow
-------------------------------------+-------------------------------------
        Reporter:  redneb            |                   Owner:
            Type:  feature request   |                  Status:  patch
        Priority:  high              |               Milestone:  7.10.1
       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
-------------------------------------+-------------------------------------
Changes (by thoughtpolice):

 * priority:  low => high
 * milestone:   => 7.10.1


Comment:

 Uh, my first impression honestly is this has the potential to be really
 bad - I'd guess most people constrain `Read` to `Int` in cases like this,
 but I could fathom a case where e.g. a webserver took an integer somewhere
 in an HTTP request and used `Read`, which could lead to an easy denial of
 service.

 I'm fine with shuffling to avoid boot files/cycles and whatnot. Do update
 the patch please.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10067#comment:8>
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