From 0b7da9641cb482ea053eb49ea633371838759b68 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 27 Mar 2023 22:12:15 -0700
Subject: [PATCH] Improve error message on empty parens inside
 parse_nested_meta

---
 src/meta.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/meta.rs b/src/meta.rs
index 766d5b7033..b6bcf9830d 100644
--- a/src/meta.rs
+++ b/src/meta.rs
@@ -401,6 +401,8 @@ fn parse_meta_path(input: ParseStream) -> Result<Path> {
             if input.peek(Ident::peek_any) {
                 let ident = Ident::parse_any(input)?;
                 segments.push_value(PathSegment::from(ident));
+            } else if input.is_empty() {
+                return Err(input.error("expected nested attribute"));
             } else if input.peek(Lit) {
                 return Err(input.error("unexpected literal in nested attribute, expected ident"));
             } else {