use std::mem::size_of;

struct SymbolRef {
    n: core::num::NonZeroUsize,
}

struct BadSymbolRef {
    n: usize,
}

fn main() {
    println!("usize: {}", size_of::<usize>());
    println!("SymbolRef: {}", size_of::<SymbolRef>());
    println!("Option<SymbolRef>: {}", size_of::<Option<SymbolRef>>());
    println!("BadSymbolRef: {}", size_of::<BadSymbolRef>());
    println!("Option<BadSymbolRef>: {}", size_of::<Option<BadSymbolRef>>());
}