#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(sized_type_properties)]
use core::mem::SizedTypeProperties;
fn do_something_with<T>() {
    if T::IS_ZST {} else {}
}
struct MyUnit;
fn main() {
    assert!(MyUnit::IS_ZST);
    assert!(!< i32 >::IS_ZST);
    assert!(! String::IS_ZST);
}