src/test/ui/proc-macro/weird-hygiene.rs

   1 // aux-build:weird-hygiene.rs
   2 // check-pass
   3 // FIXME: This should actually error, see PR #73084
   4
   5 #![feature(stmt_expr_attributes)]
   6 #![feature(proc_macro_hygiene)]
   7
   8 extern crate weird_hygiene;
   9 use weird_hygiene::*;
  10
  11 macro_rules! other {
  12     ($tokens:expr) => {
  13         macro_rules! call_it {
  14             ($outer_ident:ident) => {
  15                 macro_rules! inner {
  16                     () => {
  17                         $outer_ident;
  18                     }
  19                 }
  20             }
  21         }
  22
  23         #[derive(WeirdDerive)]
  24         enum MyEnum {
  25             Value = (stringify!($tokens + hidden_ident), 1).1
  26         }
  27
  28         inner!();
  29     }
  30 }
  31
  32 macro_rules! invoke_it {
  33     ($token:expr) => {
  34         #[recollect_attr] {
  35             $token;
  36             hidden_ident
  37         }
  38     }
  39 }
  40
  41 fn main() {
  42     // `other` and `invoke_it` are both macro_rules! macros,
  43     // so it should be impossible for them to ever see `hidden_ident`,
  44     // even if they invoke a proc macro.
  45     let hidden_ident = "Hello1";
  46     other!(50);
  47     invoke_it!(25);
  48 }