error[E0255]: the name `bar` is defined multiple times
  --> $DIR/issue-8640.rs:5:5
   |
LL |     use baz::bar;
   |         -------- previous import of the module `bar` here
LL |     mod bar {}
   |     ^^^^^^^ `bar` redefined here
   |
   = note: `bar` must be defined only once in the type namespace of this module
help: you can use `as` to change the binding name of the import
   |
LL |     use baz::bar as other_bar;
   |         ^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0255`.