swap_node        3099 ext/mbstring/oniguruma/regcomp.c   swap_node(node, head);
swap_node        3170 ext/mbstring/oniguruma/regcomp.c 	      swap_node(node, en);
swap_node        3489 ext/mbstring/oniguruma/regcomp.c   swap_node(node, top_root);