X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=compiler%2Frustc_builtin_macros%2Fsrc%2Fproc_macro_harness.rs;h=b88de224675379a24f1f78e50c9ea9f0fc7f60a1;hb=22060f20ae0b92acd056c4f2c79d19dd1b73ab5c;hp=ece660cf6f64506fd55ce481e369efcf0e98f6c8;hpb=ed61c139c2bc778ebb91f5dd6a5393aa20467f78;p=rust.git

diff --git a/compiler/rustc_builtin_macros/src/proc_macro_harness.rs b/compiler/rustc_builtin_macros/src/proc_macro_harness.rs
index ece660cf6f6..b88de224675 100644
--- a/compiler/rustc_builtin_macros/src/proc_macro_harness.rs
+++ b/compiler/rustc_builtin_macros/src/proc_macro_harness.rs
@@ -262,6 +262,7 @@ fn visit_item(&mut self, item: &'a ast::Item) {
 //          use proc_macro::bridge::client::ProcMacro;
 //
 //          #[rustc_proc_macro_decls]
+//          #[used]
 //          #[allow(deprecated)]
 //          static DECLS: &[ProcMacro] = &[
 //              ProcMacro::custom_derive($name_trait1, &[], ::$name1);
@@ -364,6 +365,7 @@ fn mk_decls(cx: &mut ExtCtxt<'_>, macros: &[ProcMacro]) -> P<ast::Item> {
         )
         .map(|mut i| {
             i.attrs.push(cx.attr_word(sym::rustc_proc_macro_decls, span));
+            i.attrs.push(cx.attr_word(sym::used, span));
             i.attrs.push(cx.attr_nested_word(sym::allow, sym::deprecated, span));
             i
         });