error[E0432]: unresolved import `NonExistent`
  --> $DIR/issue-55457.rs:1:5
   |
LL | use NonExistent;
   |     ^^^^^^^^^^^
   |     |
   |     no `NonExistent` in the root
   |     help: a similar name exists in the module: `non_existent`

error[E0432]: unresolved import `non_existent`
  --> $DIR/issue-55457.rs:2:5
   |
LL | use non_existent::non_existent;
   |     ^^^^^^^^^^^^ maybe a missing crate `non_existent`?
   |
   = help: consider adding `extern crate non_existent` to use the `non_existent` crate

error: cannot determine resolution for the derive macro `NonExistent`
  --> $DIR/issue-55457.rs:5:10
   |
LL | #[derive(NonExistent)]
   |          ^^^^^^^^^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: cannot determine resolution for the attribute macro `non_existent`
  --> $DIR/issue-55457.rs:4:3
   |
LL | #[non_existent]
   |   ^^^^^^^^^^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: cannot determine resolution for the derive macro `NonExistent`
  --> $DIR/issue-55457.rs:5:10
   |
LL | #[derive(NonExistent)]
   |          ^^^^^^^^^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: cannot determine resolution for the derive macro `NonExistent`
  --> $DIR/issue-55457.rs:5:10
   |
LL | #[derive(NonExistent)]
   |          ^^^^^^^^^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0432`.