error[E0201]: duplicate definitions with name `foo`:
  --> $DIR/impl_items-2.rs:14:5
   |
LL |     fn foo() {}
   |     ----------- item in trait
...
LL |     fn foo() {}
   |     ----------- previous definition here
...
LL |     fn foo() {}
   |     ^^^^^^^^^^^ duplicate definition

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0201`.