tests/ui/proc-macro/auxiliary/derive-same-struct.rs

extern crate proc_macro;

use proc_macro::TokenStream;

#[proc_macro_derive(AToB)]
pub fn derive1(input: TokenStream) -> TokenStream {
    println!("input1: {:?}", input.to_string());
    assert_eq!(input.to_string(), "struct A;");
    "#[derive(BToC)] struct B;".parse().unwrap()
}

#[proc_macro_derive(BToC)]
pub fn derive2(input: TokenStream) -> TokenStream {
    assert_eq!(input.to_string(), "struct B;");
    "struct C;".parse().unwrap()
}