1 struct Z { } 2 3 impl Z { run(&self, z: &mut Z)4 fn run(&self, z: &mut Z) { } start(&mut self)5 fn start(&mut self) { 6 self.run(&mut self); //~ ERROR cannot borrow 7 //~| ERROR cannot borrow 8 //~| HELP try removing `&mut` here 9 } 10 } 11 main()12fn main() { 13 let mut z = Z {}; 14 z.start(); 15 } 16