tests/ui/writing-to-immutable-vec.stderr

   1 error[E0596]: cannot borrow `v` as mutable, as it is not declared as mutable
   2   --> $DIR/writing-to-immutable-vec.rs:3:5
   3    |
   4 LL |     v[1] = 4;
   5    |     ^ cannot borrow as mutable
   6    |
   7 help: consider changing this to be mutable
   8    |
   9 LL |     let mut v: Vec<isize> = vec![1, 2, 3];
  10    |         +++
  11
  12 error: aborting due to previous error
  13
  14 For more information about this error, try `rustc --explain E0596`.