error[E0404]: `Bar` is not a trait
  --> $DIR/two_files.rs:16:6
   |
16 | impl Bar for Baz { }
   |      ^^^ `Bar` is not a trait
   | 
  ::: $DIR/two_files_data.rs
   |
15 | type Bar = Foo;
   | --------------- type aliases cannot be used for traits

error: cannot continue compilation due to previous error