const math/rand.rngMask

3 uses

	math/rand (current package)
		rand.go#L360: 	return int64(fastrand64() & rngMask)
		rng.go#L18: 	rngMask  = rngMax - 1
		rng.go#L234: 	return int64(rng.Uint64() & rngMask)

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