From f1396f54801f6ddc6c8a1c4557b45ec507b4f325 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Thu, 12 May 2022 22:17:47 -0700
Subject: [PATCH] Yet another unused macro rules lint

    warning: 1st rule of macro `generate_to_tokens` is never used
       --> src/macros.rs:120:5
        |
    120 |     (do_not_generate_to_tokens $($foo:tt)*) => ();
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: `#[warn(unused_macro_rules)]` on by default

    warning: 2nd rule of macro `generate_to_tokens` is never used
       --> src/macros.rs:122:5
        |
    122 | /     (
    123 | |         ($($arms:tt)*) $tokens:ident $name:ident {
    124 | |             $(#[cfg $cfg_attr:tt])*
    125 | |             $(#[doc $($doc_attr:tt)*])*
    ...   |
    128 | |         }
    129 | |     ) => {
        | |_____^
---
 src/macros.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/macros.rs b/src/macros.rs
index 36bba7b3df..da10a1a550 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -116,6 +116,10 @@ macro_rules! ast_enum_from_struct {
 }
 
 #[cfg(feature = "printing")]
+#[cfg_attr(
+    not(any(feature = "full", feature = "derive")),
+    allow(unknown_lints, unused_macro_rules)
+)]
 macro_rules! generate_to_tokens {
     (do_not_generate_to_tokens $($foo:tt)*) => ();