src/test/ui/imports/unresolved-imports-used.rs

// There should be *no* unused import errors.
#![deny(unused_imports)]

mod qux {
   fn quz() {}
}

use qux::quz; //~ ERROR function `quz` is private
use qux::bar; //~ ERROR unresolved import `qux::bar`
use foo::bar; //~ ERROR unresolved import `foo`

fn main() {}