#include <stdio.h>

int main (void)
{
    /*
     *
        /*
         * If a comment is active, then the pre-processor macros are also
         * considered part of the comment.
         *
         */

    puts ("Nested comments not supported.");
    goto end;

#define END_COMMENT \
     */

    puts ("Nested comments supported.");
    goto end;

end:
    return 0;
}