fn seed_input(fs: Fs) -> Bool {
    let created: Maybe<owned<File>> = std.fs.create(fs, ".zero/file-copy-input.txt")
    if created.has {
        var file: owned<File> = created.value
        let bytes: Span<u8> = std.mem.span("zero file copy\n")
        return std.fs.writeAll(&mut file, bytes)
    }
    return false
}

pub fn main(world: World) -> Void raises {
    let fs: Fs = std.fs.host()
    if seed_input(fs) {
        var buf: [4]u8 = [0, 0, 0, 0]
        if std.fs.copyFile(".zero/file-copy-input.txt", ".zero/file-copy-output.txt", buf) {
            check world.out.write("file copy ok\n")
        }
    }
}