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extern crate proc_macro;
use proc_macro::*;
#[proc_macro]
pub fn lifetimes_bang(input: TokenStream) -> TokenStream {
// Roundtrip through token trees
input.into_iter().collect()
}
#[proc_macro_attribute]
pub fn lifetimes_attr(_: TokenStream, input: TokenStream) -> TokenStream {
// Roundtrip through AST
input
}
#[proc_macro_derive(Lifetimes)]
pub fn lifetimes_derive(input: TokenStream) -> TokenStream {
// Roundtrip through a string
format!("mod m {{ {} }}", input).parse().unwrap()
}
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