error[E0493]: destructor of `Option>` cannot be evaluated at compile-time --> $DIR/drop-fail.rs:8:9 | LL | let x = Some(Vec::new()); | ^ the destructor for this type cannot be evaluated in constants error[E0493]: destructor of `Option>` cannot be evaluated at compile-time --> $DIR/drop-fail.rs:39:9 | LL | let mut tmp = None; | ^^^^^^^ the destructor for this type cannot be evaluated in constants error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0493`.