Weird import suggestion

[GuillaumeGomez]

I think it'll be pretty explicit by itself:

error[E0432]: unresolved import `rustc_infer::traits::ObligationCtxt`
  --> src/librustdoc/clean/mod.rs:21:56
   |
21 | use rustc_infer::traits::{Obligation, ObligationCause, ObligationCtxt};
   |                                                        ^^^^^^^^^^^^^^ no `ObligationCtxt` in `traits`
   |
help: a similar name exists in the module
   |
21 | use rustc_infer::traits::{Obligation, ObligationCause, Obligation};
   |                                                        ~~~~~~~~~~
help: consider importing this struct instead
   |
21 | use rustc_infer::traits::{Obligation, ObligationCause, rustc_trait_selection::traits::ObligationCtxt;
   |                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

It is suggesting to add an item from another dependency directly inside the current one, which is obviously wrong.

[est31]

Dupe of #103943