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`.