error[E0201]: duplicate definitions with name `bar`:
  --> $DIR/method-macro-backtrace.rs:22:5
   |
LL |     fn bar(&self) { }
   |     ------------- previous definition of `bar` here
LL |     fn bar(&self) { }
   |     ^^^^^^^^^^^^^ duplicate definition

error: aborting due to previous error

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