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fixes #4220

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This commit is contained in:
Araq 2018-02-10 14:20:31 +01:00
commit 45437eb113
2 changed files with 28 additions and 2 deletions
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8
lib/system.nim
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@ -2005,7 +2005,13 @@ iterator countdown*[T](a, b: T, step = 1): T {.inline.} =
## step count. `T` may be any ordinal type, `step` may only
## be positive. **Note**: This fails to count to ``low(int)`` if T = int for
## efficiency reasons.
when T is IntLikeForCount:
when T is (uint|uint64):
var res = a
while res >= b:
yield res
if res == b: break
dec(res, step)
elif T is IntLikeForCount:
var res = int(a)
while res >= int(b):
yield T(res)