error[E0053]: method `bar` has an incompatible type for trait
  --> $DIR/issue-13033.rs:8:30
   |
LL |     fn bar(&mut self, other: &dyn Foo) {}
   |                              ^^^^^^^^
   |                              |
   |                              types differ in mutability
   |                              help: change the parameter type to match the trait: `&mut dyn Foo`
   |
note: type in trait
  --> $DIR/issue-13033.rs:2:30
   |
LL |     fn bar(&mut self, other: &mut dyn Foo);
   |                              ^^^^^^^^^^^^
   = note: expected signature `fn(&mut Baz, &mut dyn Foo)`
              found signature `fn(&mut Baz, &dyn Foo)`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0053`.