error[E0433]: failed to resolve. Maybe a missing `extern crate non;`?
 --> src/lib.rs:5:13
  |
5 |         use non::existent::module;
  |             ^^^ Maybe a missing `extern crate non;`?

warning: unused import: `non::existent::module`
 --> src/lib.rs:5:13
  |
5 |         use non::existent::module;
  |             ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: #[warn(unused_imports)] on by default

error: aborting due to previous error

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

To learn more, run the command again with --verbose.