error[E0382]: use of moved value: `x` --> $DIR/move-in-guard-1.rs:10:24 | LL | let x: Box<_> = Box::new(1); | - move occurs because `x` has type `Box`, which does not implement the `Copy` trait ... LL | (1, _) if take(x) => (), | - value moved here LL | (_, 2) if take(x) => (), | ^ value used here after move | note: consider changing this parameter type in function `take` to borrow instead if owning the value isn't necessary --> $DIR/move-in-guard-1.rs:15:15 | LL | fn take(_: T) -> bool { false } | ---- ^ this parameter takes ownership of the value | | | in this function help: consider cloning the value if the performance cost is acceptable | LL | (1, _) if take(x.clone()) => (), | ++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0382`.