From 1f8213082cdc170f31655f8cbd6064125a033bab Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Thu, 24 Sep 2020 23:37:45 +0900
Subject: [PATCH] py* macro raises better error for duplicated item

---
 derive/src/util.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/derive/src/util.rs b/derive/src/util.rs
index 735f48481..52f80a68d 100644
--- a/derive/src/util.rs
+++ b/derive/src/util.rs
@@ -27,10 +27,10 @@ impl ItemNursery {
         cfgs: Vec<Attribute>,
         tokens: TokenStream,
     ) -> Result<()> {
-        if let Some(existing) = self.0.insert((name, cfgs), tokens) {
+        if let Some(existing) = self.0.insert((name.clone(), cfgs), tokens) {
             Err(syn::Error::new_spanned(
                 existing,
-                "Duplicated #[py*] attribute found",
+                format!("Duplicated #[py*] attribute found for '{}'", name),
             ))
         } else {
             Ok(())