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