error[E0433]: failed to resolve: use of undeclared crate or module `rect`
  --> $DIR/issue-101749-2.rs:14:13
   |
LL |     let _ = rect::area();
   |             ^^^^ use of undeclared crate or module `rect`

error: aborting due to previous error

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