pub unsafe extern "C" fn igraph_matrix_list_push_back_new(
v: *mut igraph_matrix_list_t,
result: *mut *mut igraph_matrix_t,
) -> igraph_error_tpub unsafe extern "C" fn igraph_matrix_list_push_back_new(
v: *mut igraph_matrix_list_t,
result: *mut *mut igraph_matrix_t,
) -> igraph_error_t