approxRational is wrong when (rat - eps) overflows in negative direction
This program is wrong. The second output should be 0 % 1.
import Data.Ratio
main = do
print (approxRational (0 % 1 :: Ratio Int) (1 % 10)) -- 0%1, correct
print (approxRational (0 % 1 :: Ratio Word) (1 % 10)) -- 1%1, incorrect
The problem is that (rat-eps) overflows in the negative direction (see source).
Trac metadata
Trac field | Value |
---|---|
Version | 8.2.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | libraries/base |
Test case | |
Differential revisions | |
BlockedBy | |
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Blocking | |
CC | |
Operating system | |
Architecture |