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extern crate proc_macro;
use proc_macro::*;
#[proc_macro]
pub fn check(input: TokenStream) -> TokenStream {
// Parsed `x2` can refer to `x2` from `input`
let parsed1: TokenStream = "let x3 = x2;".parse().unwrap();
// `x3` parsed from one string can refer to `x3` parsed from another string.
let parsed2: TokenStream = "let x4 = x3;".parse().unwrap();
// Manually assembled `x4` can refer to parsed `x4`.
let manual: Vec<TokenTree> = vec![
Ident::new("let", Span::call_site()).into(),
Ident::new("x5", Span::call_site()).into(),
Punct::new('=', Spacing::Alone).into(),
Ident::new("x4", Span::call_site()).into(),
Punct::new(';', Spacing::Alone).into(),
];
input.into_iter().chain(parsed1.into_iter())
.chain(parsed2.into_iter())
.chain(manual.into_iter())
.collect()
}
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