error[E0506]: cannot assign to `self.container_field` because it is borrowed --> $DIR/issue-81365-9.rs:21:9 | LL | let first = &Deref::deref(self).target_field; | ---- borrow of `self.container_field` occurs here LL | self.container_field = true; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `self.container_field` occurs here LL | first; | ----- borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0506`.