error[E0592]: duplicate definitions with name `bar`
  --> $DIR/method-macro-backtrace.rs:22:5
   |
LL |     fn bar(&self) { }
   |     ------------- other definition for `bar`
LL |     fn bar(&self) { }
   |     ^^^^^^^^^^^^^ duplicate definitions for `bar`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0592`.