1 error[E0596]: cannot borrow `x` as mutable, as it is not declared as mutable
2 --> $DIR/E0596.rs:16:13
5 | - help: consider changing this to be mutable: `mut x`
6 LL | let y = &mut x; //[ast]~ ERROR [E0596]
7 | ^^^^^^ cannot borrow as mutable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.