error[E0578]: cannot find module or enum `foo` in the crate root
  --> $DIR/issue-28388-1.rs:13:5
   |
LL | use foo::{}; //~ ERROR cannot find module or enum `foo` in the crate root
   |     ^^^ not found in the crate root

error: aborting due to previous error

For more information about this error, try `rustc --explain E0578`.