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error[E0596]: cannot borrow `*a` as mutable, as it is behind a `&` reference
  --> $DIR/mut-arg-hint.rs:3:9
   |
LL |         a.push_str("bar");
   |         ^^^^^^^^^^^^^^^^^ `a` is a `&` reference, so the data it refers to cannot be borrowed as mutable
   |
help: consider changing this to be a mutable reference
   |
LL |     fn foo(mut a: &mut String) {
   |                   ~~~~~~~~~~~

error[E0596]: cannot borrow `*a` as mutable, as it is behind a `&` reference
  --> $DIR/mut-arg-hint.rs:8:5
   |
LL |     a.push_str("foo");
   |     ^^^^^^^^^^^^^^^^^ `a` is a `&` reference, so the data it refers to cannot be borrowed as mutable
   |
help: consider changing this to be a mutable reference
   |
LL | pub fn foo<'a>(mut a: &'a mut String) {
   |                       ~~~~~~~~~~~~~~

error[E0596]: cannot borrow `*a` as mutable, as it is behind a `&` reference
  --> $DIR/mut-arg-hint.rs:15:9
   |
LL |         a.push_str("foo");
   |         ^^^^^^^^^^^^^^^^^ `a` is a `&` reference, so the data it refers to cannot be borrowed as mutable
   |
help: consider changing this to be a mutable reference
   |
LL |     pub fn foo(mut a: &mut String) {
   |                       ~~~~~~~~~~~

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0596`.