Posix

    pub const Posix = struct {
        remaining: Vector,

        pub const InitError = error{};

        pub fn init(a: Args) Posix {
            return .{ .remaining = a.vector };
        }

        pub fn next(it: *Posix) ?[:0]const u8 {
            if (it.remaining.len == 0) return null;
            const arg = it.remaining[0];
            it.remaining = it.remaining[1..];
            return std.mem.sliceTo(arg, 0);
        }

        pub fn skip(it: *Posix) bool {
            if (it.remaining.len == 0) return false;
            it.remaining = it.remaining[1..];
            return true;
        }
    }