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

GHC ghc-devs at haskell.org
Tue Jan 28 22:09:40 UTC 2014


#8695: Arithmetic overflow from (minBound :: Int) `quot` (-1)
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        Reporter:  rleslie                      |            Owner:
            Type:  bug                          |           Status:  patch
        Priority:  normal                       |        Milestone:  7.8.1
       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:  #1042
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Comment (by rwbarton):

 Edward, to be a Euclidean domain, `Int` would first of all have to be a
 domain, which it is not. (I don't think this is nit-picking because there
 are usually several possible definitions of concepts like "Euclidean
 domain", which are equivalent under the assumption (here) that the ring is
 an integral domain. It's potentially more or less an accident which
 equivalent definition becomes accepted as The Definition, and there's no
 reason to think it has any distinguished status when the assumption is
 broken.)

 The algebraic law that I expect from division with limited-range numeric
 types is

 > if `a, b, c :: Int` and `div a b == c` then `div (toInteger a)
 (toInteger b) == toInteger c`.

 In my opinion this is a lot more useful than a law involving `fromInteger
 :: Integer -> Int`, which doesn't play nicely with division.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8695#comment:15>
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