error[E0599]: no associated function or constant named `new_undirected` found for struct `issue_30123_aux::Graph<i32, i32>` in the current scope
  --> $DIR/issue-30123.rs:7:33
   |
LL |     let ug = Graph::<i32, i32>::new_undirected();
   |                                 ^^^^^^^^^^^^^^ associated function or constant not found in `issue_30123_aux::Graph<i32, i32>`
   |
note: if you're trying to build a new `issue_30123_aux::Graph<i32, i32>`, consider using `issue_30123_aux::Graph::<N, E>::new` which returns `issue_30123_aux::Graph<_, _>`
  --> $DIR/auxiliary/issue-30123-aux.rs:14:5
   |
LL |     pub fn new() -> Self {
   |     ^^^^^^^^^^^^^^^^^^^^
   = note: the associated function or constant was found for `issue_30123_aux::Graph<N, E, Undirected>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.
