error[E0594]: cannot assign to `x`, as it is not declared as mutable --> $DIR/closure-immut-capture-error.rs:14:9 | LL | x = 2; | ^^^^^ cannot assign | help: consider changing this to be mutable | LL | let mut x = 1; | +++ error[E0596]: cannot borrow `s` as mutable, as it is not declared as mutable --> $DIR/closure-immut-capture-error.rs:20:9 | LL | s.read_to_end(&mut Vec::new()); | ^ cannot borrow as mutable | help: consider changing this to be mutable | LL | let mut s = std::io::stdin(); | +++ error: aborting due to 2 previous errors Some errors have detailed explanations: E0594, E0596. For more information about an error, try `rustc --explain E0594`.