typedef struct luckyval luckyval;
typedef struct luckytree luckytree;

typedef enum luckytypes {
	LUCKYCHAR,
	LUCKYINT,
	LUCKYLONG,
	LUCKYFLOAT,
	LUCKYDOUBLE,
	LUCKYARR,
	LUCKYVAR,
	LUCKYTREE,
} luckytypes;

typedef struct luckyval {
	union {
		char c;
		int i;
		long l;
		float f;
		double d;
		luckyval *arr;
		luckytree *tree;
		char *var;
	};
	luckytypes type;
	luckyval *nextelement;
} luckyval;

typedef struct luckytree {
	char *function;
	luckyval *arguments;	
	luckytree *next;
} luckytree;

luckytree *parse(char *expr);