pub unsafe extern "C" fn igraph_adjlist_init_empty(
al: *mut igraph_adjlist_t,
no_of_nodes: igraph_int_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_adjlist_init_empty(
al: *mut igraph_adjlist_t,
no_of_nodes: igraph_int_t,
) -> igraph_error_t