From e994d35e9b2ca6ca08385473f9f3f6243ab509bb Mon Sep 17 00:00:00 2001
From: Mazdak Farrokhzad <twingoow@gmail.com>
Date: Sat, 22 Jun 2019 13:19:34 +0200
Subject: Lint empty 'derive()' as unused attribute.

---
 src/libsyntax/ext/derive.rs | 4 ----
 1 file changed, 4 deletions(-)

(limited to 'src/libsyntax/ext')

diff --git a/src/libsyntax/ext/derive.rs b/src/libsyntax/ext/derive.rs
index abc451c96ae..3b4243ed24f 100644
--- a/src/libsyntax/ext/derive.rs
+++ b/src/libsyntax/ext/derive.rs
@@ -30,10 +30,6 @@ pub fn collect_derives(cx: &mut ExtCtxt<'_>, attrs: &mut Vec<ast::Attribute>) ->
 
         match attr.parse_list(cx.parse_sess,
                               |parser| parser.parse_path_allowing_meta(PathStyle::Mod)) {
-            Ok(ref traits) if traits.is_empty() => {
-                cx.span_warn(attr.span, "empty trait list in `derive`");
-                false
-            }
             Ok(traits) => {
                 result.extend(traits);
                 true
-- 
cgit 1.4.1-3-g733a5