fprintf(stderr, "Parser: missing )\n");
av_log(NULL, AV_LOG_ERROR, "Parser: missing )\n");
static void evalPow(Parser *p){    int neg= 0;    if(p->s[0]=='+') p->s++;           if(p->s[0]=='-'){         neg= 1;        p->s++;    }        if(p->s[0]=='('){        p->s++;;        evalExpression(p);        if(p->s[0]!=')')            fprintf(stderr, "Parser: missing )\n");        p->s++;    }else{        evalPrimary(p);    }        if(neg) push(p, -pop(p));}