[GHC] #15081: Finite list becomes infinite after maping fractional function for high numbers

[GHC]

#15081: Finite list becomes infinite after maping fractional function for high
numbers
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        Reporter:  Onsed             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Incorrect result  |            Test Case:
  at runtime                         |  libraries/base/tests/enumNumeric
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4650
       Wiki Page:                    |
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Comment (by bgamari):

 I know that this is probably going to be an unpopular point-of-view but I
 would argue that we should consider just dropping the `Enum` instance on
 floating point types. As was stated earlier, enumerating floating point
 numbers is inherently fragile. I'm sure removing the instance would break
 a non-trivial amount of code, but arguably that code is broken anyways.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15081#comment:15>
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