void fml_lr_values (Fml fml, struct fml_node *l, int *left_val,
struct fml_node *r, int *right_val);
void fml_cmd_lex (struct fml_node **np, struct token *tp);
void fml_lr_values (Fml fml, struct fml_node *l, int *left_val,
struct fml_node *r, int *right_val);
void fml_cmd_lex (struct fml_node **np, struct token *tp);