error[E0507]: cannot move out of `y`, a captured variable in an `Fn` closure --> $DIR/unboxed-closures-move-upvar-from-non-once-ref-closure.rs:12:9 | LL | let y = vec![format!("World")]; | - captured outer variable LL | call(|| { | -- captured by this `Fn` closure LL | y.into_iter(); | ^ ----------- `y` moved due to this method call | | | move occurs because `y` has type `Vec`, which does not implement the `Copy` trait | note: `into_iter` takes ownership of the receiver `self`, which moves `y` --> $SRC_DIR/core/src/iter/traits/collect.rs:LL:COL help: you can `clone` the value and consume it, but this might not be your desired behavior | LL | y.clone().into_iter(); | ++++++++ error: aborting due to previous error For more information about this error, try `rustc --explain E0507`.