最小的虛擬自定義派生

Cargo.toml：

[package]
name = "customderive"
version = "0.1.0"
[lib]
proc-macro=true

SRC / lib.rs：

#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::TokenStream;

#[proc_macro_derive(Dummy)]
pub fn qqq(input: TokenStream) -> TokenStream {
    "".parse().unwrap()
}

例項/ hello.rs

#[macro_use]
extern crate customderive;

#[derive(Dummy)]
struct Qqq;

fn main(){}