Add operator INIT_WITH for oplist with PUSH.

m-rbtree.h

@@ -52,6 +52,7 @@
 #define RBTREEI_OPLIST2(name, oplist)                                   \
   (INIT(M_C(name, _init)),						\
    INIT_SET(M_C(name, _init_set)),					\
+   INIT_WITH(API_1(M_INIT_VAI)),                                        \
    SET(M_C(name, _set)),						\
    CLEAR(M_C(name, _clear)),						\
    INIT_MOVE(M_C(name, _init_move)),					\