From 4cb8d079f8658bef6b7a41caca11f5111d067df5 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 27 Mar 2023 22:00:46 -0700
Subject: [PATCH] Accept empty #[serde()] attribute

---
 serde_derive/src/internals/attr.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/serde_derive/src/internals/attr.rs b/serde_derive/src/internals/attr.rs
index 9875b6606..b0a7d08a2 100644
--- a/serde_derive/src/internals/attr.rs
+++ b/serde_derive/src/internals/attr.rs
@@ -307,6 +307,12 @@ impl Container {
                 continue;
             }
 
+            if let syn::Meta::List(meta) = &attr.meta {
+                if meta.tokens.is_empty() {
+                    continue;
+                }
+            }
+
             if let Err(err) = attr.parse_nested_meta(|meta| {
                 if meta.path == RENAME {
                     // #[serde(rename = "foo")]
@@ -762,6 +768,12 @@ impl Variant {
                 continue;
             }
 
+            if let syn::Meta::List(meta) = &attr.meta {
+                if meta.tokens.is_empty() {
+                    continue;
+                }
+            }
+
             if let Err(err) = attr.parse_nested_meta(|meta| {
                 if meta.path == RENAME {
                     // #[serde(rename = "foo")]
@@ -1033,6 +1045,12 @@ impl Field {
                 continue;
             }
 
+            if let syn::Meta::List(meta) = &attr.meta {
+                if meta.tokens.is_empty() {
+                    continue;
+                }
+            }
+
             if let Err(err) = attr.parse_nested_meta(|meta| {
                 if meta.path == RENAME {
                     // #[serde(rename = "foo")]