609 #define TREE_IS_ONLY_CHILD(root, x, field) \  in UnregCb()  argument
610 		(TREE_PARENT((x), field) ?			   \  in UnregCb()
611 		 TREE_PARENT((x), field)->field.tn_first == (x) && \  in UnregCb()
612 		 TREE_PARENT((x), field)->field.tn_last == (x) :   \  in UnregCb()
613 		 (x) == (root) && (x)->field.tn_younger == NULL)  in UnregCb()
870 #define PRINT_EV(event, field)						\  argument
873 	       #field, (event), (event)->ev,				\
874 	       (event)->field.tn_older   ? (event)->field.tn_older->ev   : -1, \
875 	       (event)->field.tn_younger ? (event)->field.tn_younger->ev : -1, \
876 	       (event)->field.tn_first   ? (event)->field.tn_first->ev   : -1, \
877 	       (event)->field.tn_last    ? (event)->field.tn_last->ev    : -1, \
878 	       (event)->field.tn_parent  ? (event)->field.tn_parent->ev  : -1, \