1 error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable
2 --> $DIR/writing-to-immutable-vec.rs:3:5
4 LL | let v: Vec<isize> = vec![1, 2, 3];
5 | - help: consider changing this to be mutable: `mut v`
7 | ^ cannot borrow as mutable
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.