error[E0596]: cannot borrow `self` as mutable, as it is not declared as mutable
  --> $DIR/issue-34126.rs:6:18
   |
LL |         self.run(&mut self);
   |                  ^^^^^^^^^
   |                  |
   |                  cannot borrow as mutable
   |                  try removing `&mut` here

error[E0502]: cannot borrow `self` as mutable because it is also borrowed as immutable
  --> $DIR/issue-34126.rs:6:18
   |
LL |         self.run(&mut self);
   |         ---- --- ^^^^^^^^^ mutable borrow occurs here
   |         |    |
   |         |    immutable borrow later used by call
   |         immutable borrow occurs here

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0502, E0596.
For more information about an error, try `rustc --explain E0502`.