如何将结构传递给yacc文件中的函数？

%{
    struct my_struct {
        int value1;
        char value2;
    };
%}

%{
    void my_function(struct my_struct *s);
%}

expression:
    NUMBER {
        struct my_struct s;
        s.value1 = $1;
        s.value2 = 'a';
        my_function(&s);
    }

%{
    void my_function(struct my_struct *s) {
        printf("Value 1: %d\n", s->value1);
        printf("Value 2: %c\n", s->value2);
    }
%}