tests/ui/proc-macro/macro-rules-derive-cfg.rs

   1 // check-pass
   2 // compile-flags: -Z span-debug --error-format human
   3 // aux-build:test-macros.rs
   4
   5 #![feature(rustc_attrs)]
   6 #![feature(stmt_expr_attributes)]
   7
   8 #![no_std] // Don't load unnecessary hygiene information from std
   9 extern crate std;
  10
  11 #[macro_use]
  12 extern crate test_macros;
  13
  14 macro_rules! produce_it {
  15     ($expr:expr) => {
  16         #[derive(Print)]
  17         struct Foo {
  18             val: [bool; {
  19                 let a = #[cfg_attr(not(FALSE), rustc_dummy(first))] $expr;
  20                 0
  21             }]
  22         }
  23     }
  24 }
  25
  26 produce_it!(#[cfg_attr(not(FALSE), rustc_dummy(second))] {
  27     #![cfg_attr(not(FALSE), allow(unused))]
  28     30
  29 });
  30
  31 fn main() {}