fn main() {
    println!("{:?}", {
        std::mem::size_of_val::<std::cell::RefCell<dyn std::fmt::Debug>>(std::cell::RefCell::new(10))
    });
}


/* ~~~~=== stderr ===~~~~
   Compiling playground v0.0.1 (file:///playground)
error[E0308]: mismatched types
 --> src/main.rs:5:74
  |
5 |         std::mem::size_of_val::<std::cell::RefCell<dyn std::fmt::Debug>>(std::cell::RefCell::new(10))
  |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |                                                                          |
  |                                                                          expected reference, found struct `std::cell::RefCell`
  |                                                                          help: consider borrowing here: `&std::cell::RefCell::new(10)`
  |
  = note: expected type `&std::cell::RefCell<std::fmt::Debug>`
             found type `std::cell::RefCell<{integer}>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
error: Could not compile `playground`.

To learn more, run the command again with --verbose.

*/

/* ~~~~=== stdout ===~~~~

*/