mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-02 11:44:28 +00:00
21 lines
582 B
Rust
21 lines
582 B
Rust
//@ force-host
|
|
//@ no-prefer-dynamic
|
|
|
|
#![crate_type = "proc-macro"]
|
|
|
|
extern crate proc_macro;
|
|
|
|
use proc_macro::{TokenStream, TokenTree, Group, Delimiter};
|
|
|
|
#[proc_macro_attribute]
|
|
pub fn first(_attr: TokenStream, item: TokenStream) -> TokenStream {
|
|
let tokens: TokenStream = "#[derive(Second)]".parse().unwrap();
|
|
let wrapped = TokenTree::Group(Group::new(Delimiter::None, item.into_iter().collect()));
|
|
tokens.into_iter().chain(std::iter::once(wrapped)).collect()
|
|
}
|
|
|
|
#[proc_macro_derive(Second)]
|
|
pub fn second(item: TokenStream) -> TokenStream {
|
|
TokenStream::new()
|
|
}
|