How to match Boxed value?

[shiqicao]

Is there a way to match Box<T>, where T doesn't implement Copy?

        #[derive(Debug)]
        struct A(Box<B>);

        #[derive(Debug)]
        struct B(usize);

        let a = A(Box::new(B(1usize)));
   
        type BoxB = Box<B>;

        expect_that!(a, pat! (A( result_of_ref!(|x: &BoxB| x.as_ref(), pat!(&B(eq(&1usize)))))));

Got error,

error: lifetime may not live long enough
   --> crates/pota_parser/src/parser/mod.rs:716:60
    |
716 |         expect_that!(a, pat! (A( result_of_ref!(|x: &BoxB| x.as_ref(), pat!(&B(eq(&1usize)))))));
    |                                                     -    - ^^^^^^^^^^ returning this value requires that `'1` must outlive `'2`
    |                                                     |    |
    |                                                     |    return type of closure is &'2 B
    |                                                     let's call the lifetime of this reference `'1`