[GHC] #8695: Arithmetic overflow from (minBound :: Int) `quot` (-1)
GHC
ghc-devs at haskell.org
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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