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randomize: added doAssert(seed!=0) to avoid invalid (non-random) behavior (#10635)

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Timothee Cour 2019-02-12 00:33:20 -08:00 • committed by Andreas Rumpf
commit 304b1dd34b
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lib/pure/random.nim
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@ -513,6 +513,7 @@ proc initRand*(seed: int64): Rand =
let now = getTime()
var r2 = initRand(now.toUnix * 1_000_000_000 + now.nanosecond)
doAssert seed != 0 # 0 causes `rand(int)` to always return 0 for example.
result.a0 = ui(seed shr 16)
result.a1 = ui(seed and 0xffff)
discard next(result)