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error[E0594]: cannot assign to field `self.how_hungry` of immutable binding
--> $DIR/mutable-class-fields-2.rs:9:5
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LL | pub fn eat(&self) {
| ----- use `&mut self` here to make mutable
LL | self.how_hungry -= 5; //~ ERROR cannot assign
| ^^^^^^^^^^^^^^^^^^^^ cannot mutably borrow field of immutable binding
error: aborting due to previous error
For more information about this error, try `rustc --explain E0594`.
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