function vla(...)
{
    local i, sum = 0;
    write("0");
    for(i = 0; i < ARGC; i++)
    {
	write("+", ARGV[i]);
	sum += ARGV[i];
    }
    write("=");
    return sum;
}

writeln(vla());
writeln(vla(1));
writeln(vla(1, 2));
writeln(funcall("vla", 1, 2, 3));