pub fn main(world: World) -> Void raises {
    let bytes: [3]u8 = [65, 0, 66]
    var read_buf: [3]u8 = [0, 0, 0]
    var small_buf: [2]u8 = [0, 0]
    let written: Maybe<usize> = std.fs.writeBytes(".zero/conformance/std-fs-bytes.bin", bytes)
    let read: Maybe<usize> = std.fs.readBytes(".zero/conformance/std-fs-bytes.bin", read_buf)
    let truncated: Maybe<usize> = std.fs.readBytes(".zero/conformance/std-fs-bytes.bin", small_buf)
    let missing: Maybe<usize> = std.fs.readBytes(".zero/conformance/missing.bin", read_buf)
    if written.has && written.value == 3 && read.has && read.value == 3 && read_buf[1] == 0_u8 && truncated.has && truncated.value == 3 && small_buf[0] == 65_u8 && !missing.has {
        check world.err.write("fs bytes err ok\n")
        check world.out.write("fs bytes ok\n")
    }
}