[GHC] #10754: truncate /= double2Int

[GHC]

#10754: truncate /= double2Int
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        Reporter:  cblp              |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:
       Component:  libraries/base    |                 Version:  7.10.2
      Resolution:  duplicate         |                Keywords:  truncate,
                                     |  double2Int, rewrite, rule
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by rwbarton):

 While not exactly identical, the issues here and in #3070 are so closely
 related that any attempt to address one should also take the other into
 consideration. So, it's more helpful if the discussion is consolidated
 into one ticket thread.

 Certainly we would not give up the rule `truncate = double2Int` simply
 because the two sides give different nonsense outputs for the same
 nonsense input.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10754#comment:6>
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