error[E0503]: cannot use `x` because it was mutably borrowed --> $DIR/borrowck-non-exhaustive.rs:12:11 | LL | let y = &mut x; | ------ `x` is borrowed here LL | match x { | ^ use of borrowed `x` ... LL | drop(y); | - borrow later used here error: aborting due to previous error For more information about this error, try `rustc --explain E0503`.