67 struct expr *expr_copy(const struct expr *org)  in expr_copy()  argument
71 	if (!org)  in expr_copy()
74 	e = malloc(sizeof(*org));  in expr_copy()
75 	memcpy(e, org, sizeof(*org));  in expr_copy()
76 	switch (org->type) {  in expr_copy()
78 		e->left = org->left;  in expr_copy()
81 		e->left.expr = expr_copy(org->left.expr);  in expr_copy()
85 		e->left.sym = org->left.sym;  in expr_copy()
86 		e->right.sym = org->right.sym;  in expr_copy()
91 		e->left.expr = expr_copy(org->left.expr);  in expr_copy()
92 		e->right.expr = expr_copy(org->right.expr);  in expr_copy()