pub fn main(world: World) -> Void raises {
    var ok: Bool = true
    let duration: Duration = std.time.add(std.time.us(2500_i64), std.time.ms(1))
    let window: Duration = std.time.add(std.time.minutes(1), std.time.seconds(30))
    let clamped: Duration = std.time.clamp(std.time.seconds(3), std.time.seconds(1), std.time.seconds(2))
    if std.time.asNs(std.time.ns(42_i64)) != 42_i64 {
        ok = false
    }
    if std.time.asUsFloor(std.time.ns(1999_i64)) != 1_i64 {
        ok = false
    }
    if std.time.asMsFloor(duration) != 3 {
        ok = false
    }
    if std.time.asSecondsFloor(window) != 90_i64 {
        ok = false
    }
    if std.time.asSecondsFloor(clamped) != 2_i64 {
        ok = false
    }
    let negative_tick: Duration = std.time.sub(std.time.zero(), std.time.ns(1_i64))
    if std.time.asUsFloor(negative_tick) != 0_i64 - 1_i64 {
        ok = false
    }
    if std.time.asMsFloor(negative_tick) != 0 - 1 {
        ok = false
    }
    if std.time.asSecondsFloor(negative_tick) != 0_i64 - 1_i64 {
        ok = false
    }
    if !std.time.lessThan(std.time.zero(), duration) {
        ok = false
    }
    if !std.time.isZero(std.time.zero()) {
        ok = false
    }
    if std.time.asNs(std.time.abs(negative_tick)) != 1_i64 {
        ok = false
    }
    if std.time.asSecondsFloor(std.time.between(std.time.seconds(5), std.time.seconds(2))) != 3_i64 {
        ok = false
    }
    if !std.time.hasElapsed(std.time.seconds(10), std.time.seconds(13), std.time.seconds(3)) {
        ok = false
    }
    if std.time.hasElapsed(std.time.seconds(10), std.time.seconds(12), std.time.seconds(3)) {
        ok = false
    }
    var rng: RandSource = std.rand.seed(7_u32)
    let first: u32 = std.rand.nextU32(&mut rng)
    let bit: Bool = std.rand.nextBool(&mut rng)
    let third: u32 = std.rand.nextU32(&mut rng)
    if first != 1025555898_u32 || !bit || third != 2630631676_u32 {
        ok = false
    }
    var bool_rng: RandSource = std.rand.seed(7_u32)
    let bit_one: Bool = std.rand.nextBool(&mut bool_rng)
    let bit_two: Bool = std.rand.nextBool(&mut bool_rng)
    let bit_three: Bool = std.rand.nextBool(&mut bool_rng)
    if bit_one || !bit_two || !bit_three {
        ok = false
    }
    var bounded_rng: RandSource = std.rand.seed(99_u32)
    let below_ten: Maybe<u32> = std.rand.nextBelow(&mut bounded_rng, 10_u32)
    if below_ten.has {
        if below_ten.value >= 10_u32 {
            ok = false
        }
    } else {
        ok = false
    }
    let in_range: Maybe<u32> = std.rand.rangeU32(&mut bounded_rng, 40_u32, 50_u32)
    if in_range.has {
        if in_range.value < 40_u32 || in_range.value >= 50_u32 {
            ok = false
        }
    } else {
        ok = false
    }
    let empty_below: Maybe<u32> = std.rand.nextBelow(&mut bounded_rng, 0_u32)
    let empty_range: Maybe<u32> = std.rand.rangeU32(&mut bounded_rng, 4_u32, 4_u32)
    if empty_below.has || empty_range.has {
        ok = false
    }
    let factorial: Maybe<u32> = std.math.factorialU32(5_u32)
    if factorial.has {
        if factorial.value != 120_u32 {
            ok = false
        }
    } else {
        ok = false
    }
    let binomial: Maybe<u32> = std.math.binomialU32(6_u32, 2_u32)
    if binomial.has {
        if binomial.value != 15_u32 {
            ok = false
        }
    } else {
        ok = false
    }
    let larger_binomial: Maybe<u32> = std.math.binomialU32(31_u32, 15_u32)
    if larger_binomial.has {
        if larger_binomial.value != 300540195_u32 {
            ok = false
        }
    } else {
        ok = false
    }
    let checked: Maybe<u32> = std.math.checkedPowU32(2_u32, 10_u32)
    if checked.has {
        if checked.value != 1024_u32 {
            ok = false
        }
    } else {
        ok = false
    }
    if std.math.sqrtFloorU32(99) != 9 || std.math.saturatingAddU32(4294967295_u32, 1_u32) != 4294967295_u32 {
        ok = false
    }
    if ok {
        check world.out.write("std numeric random time ok\n")
    }
}