[GHC] #8695: Arithmetic overflow from (minBound :: Int) `quot` (-1)

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Sun Jan 26 09:12:02 UTC 2014


#8695: Arithmetic overflow from (minBound :: Int) `quot` (-1)
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        Reporter:  rleslie                      |            Owner:
            Type:  bug                          |           Status:  new
        Priority:  normal                       |        Milestone:
       Component:  libraries/haskell2010        |          Version:  7.6.3
      Resolution:                               |         Keywords:
Operating System:  Unknown/Multiple             |     Architecture:
 Type of failure:  Incorrect result at runtime  |  Unknown/Multiple
       Test Case:                               |       Difficulty:
        Blocking:                               |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Comment (by hvr):

 Replying to [ticket:8695 rleslie]:
 > The fact that an exception is raised adds an unnecessary burden in pure
 code to ensure `quot` (or `div`) is never called with these specific
 arguments.

 Fwiw, you also have to avoid calling `quot`/`div` with a `0`-divisor,
 otherwise a div-by-zero exception is raised.  I wonder if this isn't
 rather a deficiency of the Haskell2010 report, failing to mention that the
 modulo-semantics make an exception for the `quot`/`div` operations.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8695#comment:2>
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