error[E0382]: use of moved value --> $DIR/move-in-pattern-mut-in-loop.rs:7:21 | LL | if let Some(mut _x) = opt {} | ^^^^^^ value moved here, in previous iteration of loop | = note: move occurs because value has type `&mut i32`, which does not implement the `Copy` trait help: borrow this field in the pattern to avoid moving `opt.0` | LL | if let Some(ref mut _x) = opt {} | +++ error: aborting due to previous error For more information about this error, try `rustc --explain E0382`.