tests/ui/proc-macro/auxiliary/lifetimes-rpass.rs

   1 // force-host
   2 // no-prefer-dynamic
   3
   4 #![crate_type = "proc-macro"]
   5
   6 extern crate proc_macro;
   7
   8 use proc_macro::*;
   9
  10 #[proc_macro]
  11 pub fn lifetimes_bang(input: TokenStream) -> TokenStream {
  12     // Roundtrip through token trees
  13     input.into_iter().collect()
  14 }
  15
  16 #[proc_macro_attribute]
  17 pub fn lifetimes_attr(_: TokenStream, input: TokenStream) -> TokenStream {
  18     // Roundtrip through AST
  19     input
  20 }
  21
  22 #[proc_macro_derive(Lifetimes)]
  23 pub fn lifetimes_derive(input: TokenStream) -> TokenStream {
  24     // Roundtrip through a string
  25     format!("mod m {{ {} }}", input).parse().unwrap()
  26 }