struct Foo;

impl Foo {
    fn cleanup (self: &'_ mut Self)
    {
        panic!("Foo::cleanup({:p})", self);
    }
}

struct Struct {
    foo: Foo,
}

impl Drop for Struct {
    fn drop (self: &'_ mut Self)
    {
        use ::std::panic;
        let mut foo = panic::AssertUnwindSafe(&mut self.foo);
        match panic::catch_unwind(move || {
            foo.cleanup();
        })
        {
            | Ok(()) => {},

            | Err(err) => {
                eprintln!("{:p}.foo.cleanup() panicked ({err_msg})", self,
                    err_msg = if let Some(s) = err.downcast_ref::<String>() {
                        s as &dyn ::core::fmt::Display
                    } else {
                        &""
                    },
                );
            },
        }
    }
}

fn main ()
{
    let _struct = Struct { foo: Foo, };
    if true { panic!("First panic!"); }
    println!("Program keeps going");
}