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: chained comparison operators require parentheses
 --> src/main.rs:5:30
  |
5 |         std::mem::size_of_val<std::cell::RefCell<dyn std::fmt::Debug>>(std::cell::RefCell::new(10))
  |                              ^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: use `::<...>` instead of `<...>` if you meant to specify type arguments
  = help: or use `(...)` if you meant to specify fn arguments

error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `std`
 --> src/main.rs:5:54
  |
5 |         std::mem::size_of_val<std::cell::RefCell<dyn std::fmt::Debug>>(std::cell::RefCell::new(10))
  |                                                      ^^^ expected one of 8 possible tokens here

error: aborting due to 2 previous errors

error: Could not compile `playground`.

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

*/

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

*/