error[E0433]: failed to resolve: use of undeclared crate or module `xyz`
  --> $DIR/stashed-diag-issue-121504.rs:7:18
   |
LL | impl MyTrait for xyz::T {
   |                  ^^^ use of undeclared crate or module `xyz`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0433`.