1 #[derive(Copy, Clone)]
2 struct S;
3 
4 impl S {
mutate(&mut self)5     fn mutate(&mut self) {
6     }
7 }
8 
func(arg: S)9 fn func(arg: S) {
10     //~^ HELP consider changing this to be mutable
11     //~| SUGGESTION mut arg
12     arg.mutate();
13     //~^ ERROR cannot borrow `arg` as mutable, as it is not declared as mutable
14 }
15 
main()16 fn main() {
17     let local = S;
18     //~^ HELP consider changing this to be mutable
19     //~| SUGGESTION mut local
20     local.mutate();
21     //~^ ERROR cannot borrow `local` as mutable, as it is not declared as mutable
22 }
23