如何在Rust中实现post增量宏

[lib]
proc-macro = true

extern crate proc_macro;

use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(PostIncrement)]
pub fn post_increment(input: TokenStream) -> TokenStream {
    // 解析输入的语法树
    let input = parse_macro_input!(input as DeriveInput);

    // 获取输入的标识符名称
    let name = input.ident;

    // 生成增量宏的代码
    let expanded = quote! {
        impl #name {
            pub fn post_increment(&mut self) {
                self += 1;
            }
        }
    };

    // 将生成的代码转换为TokenStream并返回
    TokenStream::from(expanded)
}

[dependencies]
proc-macro2 = "1.0"
quote = "1.0"
syn = "1.0"

#[derive(PostIncrement)]
struct Counter(i32);

fn main() {
    let mut counter = Counter(0);
    counter.post_increment();
    println!("{}", counter.0); // 输出: 1
}