POSITION must be >= 0 and <= gl_list_size (list). */
#if 0 /* declared in gl_xlist.h */
extern gl_list_node_t gl_list_add_at (gl_list_t list, size_t position,
POSITION must be >= 0 and <= gl_list_size (list). */
#if 0 /* declared in gl_xlist.h */
extern gl_list_node_t gl_list_add_at (gl_list_t list, size_t position,