Macro app_frame::clone_to_async

macro_rules! clone_to_async {
    (
        ($($to_move:ident $(= $orig_name:expr)?),*)
        |$(mut $arg:ident),*|
        $blk:expr
    ) => { ... };
    (
        ($($to_move:ident $(= $orig_name:expr)?),*)
        |$($arg:ident),*|
        $blk:expr
    ) => { ... };
}

Clone the item and move it into the async closure.