src/test/ui/proc-macro/derive-helper-shadowing.rs

   1 // aux-build:test-macros.rs
   2
   3 #[macro_use]
   4 extern crate test_macros;
   5
   6 use test_macros::empty_attr as empty_helper;
   7
   8 #[empty_helper] //~ ERROR `empty_helper` is ambiguous
   9 #[derive(Empty)]
  10 struct S {
  11     // FIXME No ambiguity, attributes in non-macro positions are not resolved properly
  12     #[empty_helper]
  13     field: [u8; {
  14         // FIXME No ambiguity, derive helpers are not put into scope for non-attributes
  15         use empty_helper;
  16
  17         // FIXME No ambiguity, derive helpers are not put into scope for inner items
  18         #[empty_helper]
  19         struct U;
  20
  21         mod inner {
  22             #[empty_helper] //~ ERROR attribute `empty_helper` is currently unknown
  23             struct V;
  24         }
  25
  26         0
  27     }]
  28 }
  29
  30 fn main() {
  31     let s = S { field: [] };
  32 }