boost/libs/spirit/example/qi/compiler_tutorial/mini_c_samples/3.mini

/* mini program with syntax error */

int foo(n)
{
    int a = 2;
    if (n @ 3) /* we don't have @ operator in mini_c */
    {
        a = 3
    }
    return a;
}

int main()
{
    return foo(10);
}