error[E0499]: cannot borrow `**other` as mutable more than once at a time --> $DIR/issue-46589.rs:17:21 | LL | *other = match (*other).get_self() { | -------- first mutable borrow occurs here LL | Some(s) => s, LL | None => (*other).new_self() | ^^^^^^^^ | | | second mutable borrow occurs here | first borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0499`.