pub fn main(world: World) -> Void raises {
    var ok: Bool = true
    if std.math.minU32(8, 3) != 3 {
        ok = false
    }
    if std.math.minU32(4000000000_u32, 3) != 3 {
        ok = false
    }
    if std.math.maxU32(8, 3) != 8 {
        ok = false
    }
    if std.math.maxU32(4000000000_u32, 3) != 4000000000_u32 {
        ok = false
    }
    if std.math.clampU32(10, 2, 7) != 7 {
        ok = false
    }
    if std.math.clampU32(1, 7, 2) != 2 {
        ok = false
    }
    if std.math.gcdU32(84, 30) != 6 {
        ok = false
    }
    if std.math.lcmU32(21, 6) != 42 {
        ok = false
    }
    if std.math.powU32(3, 4) != 81 {
        ok = false
    }
    if std.math.modPowU32(4, 13, 497) != 445 {
        ok = false
    }
    if std.math.modPowU32(9, 0, 1) != 0 {
        ok = false
    }
    if !std.math.isPrimeU32(31) {
        ok = false
    }
    if std.math.isPrimeU32(33) {
        ok = false
    }
    if std.math.divisorCountU32(28) != 6 {
        ok = false
    }
    if std.math.properDivisorSumU32(28) != 28 {
        ok = false
    }
    if ok {
        check world.out.write("std math ok\n")
    }
}