error[E0560]: struct `Foo` has no field named `nonexistent` --> $DIR/issue-5439.rs:11:31 | LL | return Box::new(Foo { nonexistent: self, foo: i }); | ^^^^^^^^^^^ `Foo` does not have this field | = note: all struct fields are already assigned error: aborting due to previous error For more information about this error, try `rustc --explain E0560`.