error[E0596]: cannot borrow immutable borrowed content as mutable | |
--> $DIR/index-mut-help-with-impl.rs:19:5 | |
| | |
LL | Index::index(&v, 1..2).make_ascii_uppercase(); //~ ERROR | |
| ^^^^^^^^^^^^^^^^^^^^^^ cannot borrow as mutable | |
error: aborting due to previous error | |
For more information about this error, try `rustc --explain E0596`. |