Auto merge of #65793 - Centril:rollup-v40xke9, r=Centril

Rollup of 9 pull requests

Successful merges:

 - #62959 (Add by-value iterator for arrays )
 - #65390 (Add long error explanation for E0576)
 - #65408 (reorder config.toml.example options and add one missing option)
 - #65414 (ignore uninhabited non-exhaustive variant fields)
 - #65666 (Deprecated proc_macro doesn't trigger warning on build library)
 - #65742 (Pre-expansion gate most of the things)
 - #65747 (Adjust the tracking issue for `untagged_unions`.)
 - #65763 (Changed APIT with explicit generic args span to specific arg spans)
 - #65775 (Fix more `ReEmpty` ICEs)

Failed merges:

 - #65519 (trait-based structural match implementation)

r? @ghost

1 files changed, 11 insertions, 0 deletions

diff --git a/src/libsyntax_ext/proc_macro_harness.rs b/src/libsyntax_ext/proc_macro_harness.rs
index 96d0c3fcab1..c874f1ffb11 100644
--- a/src/libsyntax_ext/proc_macro_harness.rs
+++ b/src/libsyntax_ext/proc_macro_harness.rs
@@ -337,6 +337,7 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
 //          use proc_macro::bridge::client::ProcMacro;
 //
 //          #[rustc_proc_macro_decls]
+//          #[allow(deprecated)]
 //          static DECLS: &[ProcMacro] = &[
 //              ProcMacro::custom_derive($name_trait1, &[], ::$name1);
 //              ProcMacro::custom_derive($name_trait2, &["attribute_name"], ::$name2);
@@ -416,6 +417,16 @@ fn mk_decls(
     ).map(|mut i| {
         let attr = cx.meta_word(span, sym::rustc_proc_macro_decls);
         i.attrs.push(cx.attribute(attr));
+
+        let deprecated_attr = attr::mk_nested_word_item(
+            Ident::new(sym::deprecated, span)
+        );
+        let allow_deprecated_attr = attr::mk_list_item(
+            Ident::new(sym::allow, span),
+            vec![deprecated_attr]
+        );
+        i.attrs.push(cx.attribute(allow_deprecated_attr));
+
         i
     });