1error[E0594]: cannot assign to `self.how_hungry`, which is behind a `&` reference
2  --> $DIR/mutable-class-fields-2.rs:9:5
3   |
4LL |   pub fn eat(&self) {
5   |              ----- help: consider changing this to be a mutable reference: `&mut self`
6LL |     self.how_hungry -= 5;
7   |     ^^^^^^^^^^^^^^^^^^^^ `self` is a `&` reference, so the data it refers to cannot be written
8
9error: aborting due to previous error
10
11For more information about this error, try `rustc --explain E0594`.
12