1 error[E0596]: cannot borrow immutable local variable `v` as mutable
2 --> $DIR/writing-to-immutable-vec.rs:14:5
4 LL | let v: Vec<isize> = vec![1, 2, 3];
5 | - consider changing this to `mut v`
6 LL | v[1] = 4; //~ ERROR cannot borrow immutable local variable `v` as mutable
7 | ^ cannot borrow mutably
9 error: aborting due to previous error
11 For more information about this error, try `rustc --explain E0596`.