export c fn main() -> u8 {
    var storage: [8]u8 = [0_u8, 0_u8, 0_u8, 0_u8, 0_u8, 0_u8, 0_u8, 0_u8]
    var alloc: FixedBufAlloc = std.mem.fixedBufAlloc(storage)
    let first: Maybe<MutSpan<u8>> = std.mem.allocBytes(alloc, 4)
    if first.has {
        if std.mem.len(first.value) == 4 {
            let bytes: MutSpan<u8> = first.value
            if std.mem.len(bytes) == 4 {
                return first.value[0]
            }
        }
    }
    return 0_u8
}