error[E0433]: failed to resolve: use of undeclared crate or module `bar`
  --> $DIR/export2.rs:2:18
   |
LL |     pub fn x() { bar::x(); }
   |                  ^^^ use of undeclared crate or module `bar`

error: aborting due to previous error

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