error[E0308]: mismatched types
  --> $DIR/issue-22684.rs:17:17
   |
LL |     let _: () = foo::Foo.bar();
   |            --   ^^^^^^^^^^^^^^ expected `()`, found `bool`
   |            |
   |            expected due to this

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.