error: cannot declare a new module at this location
  --> $DIR/auxiliary/foo/bar.rs:11:9
   |
11 | pub mod baz;
   |         ^^^
   |
note: maybe move this module `$DIR/auxiliary/foo/bar.rs` to its own directory via `$DIR/auxiliary/foo/bar/mod.rs`
  --> $DIR/auxiliary/foo/bar.rs:11:9
   |
11 | pub mod baz;
   |         ^^^

error: aborting due to previous error(s)