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
   |
note: the binding is already a mutable borrow
  --> $DIR/issue-34126.rs:5:14
   |
LL |     fn start(&mut self) {
   |              ^^^^^^^^^
help: try removing `&mut` here
   |
LL -         self.run(&mut self);
LL +         self.run(self);
   |

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`.