fold-example-pt4.rs

fn count_statements() {
    let mut stmt_counter = StmtCounter { count: 0 };
    let item_fn_old: ItemFn = parse_quote! {
        fn hello() {
            println!("hello world");
            {
                println!("hello solar system");
                println!("hello galaxy");
            }
        }
    };
    let item_fn_new = stmt_counter.fold_item_fn(item_fn_old);
    println!("item_fn_new: {}", quote!(#item_fn_new));
    println!("count: {}", stmt_counter.count);
}