error[E0201]: duplicate definitions with name `bar`:
  --> $DIR/issue-8153.rs:21:5
   |
LL |     fn bar(&self) -> isize {1}
   |     -------------------------- previous definition of `bar` here
LL |     fn bar(&self) -> isize {2} //~ ERROR duplicate definitions
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ duplicate definition

error: aborting due to previous error

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