From 1df1fc664c4a4b12807a49ef2f1a0effda6ce064 Mon Sep 17 00:00:00 2001
From: 魏曹先生 <1992414357@qq.com>
Date: Tue, 23 Jun 2026 00:40:05 +0800
Subject: Add compile-time duplicate variant detection

Add duplicate variant checks for chain, renderer, help, and completion
registrations to produce a clear compile error instead of silently
generating unreachable code
---
 mingling_macros/src/chain.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'mingling_macros/src/chain.rs')

diff --git a/mingling_macros/src/chain.rs b/mingling_macros/src/chain.rs
index eaf43fb..a678858 100644
--- a/mingling_macros/src/chain.rs
+++ b/mingling_macros/src/chain.rs
@@ -432,6 +432,20 @@ pub fn register_chain(input: TokenStream) -> TokenStream {
     let chain_entry_str = chain_entry.to_string();
     let chain_exist_entry_str = chain_exist_entry.to_string();
 
+    // Check for duplicate variant before inserting
+    let variant_name = previous_type
+        .path
+        .segments
+        .last()
+        .unwrap()
+        .ident
+        .to_string();
+    if let Err(err) =
+        crate::check_duplicate_variant(&chains, &variant_name, "chain", previous_type.span())
+    {
+        return err.into();
+    }
+
     chains.insert(chain_entry_str);
     chain_exist.insert(chain_exist_entry_str);
 
-- 
cgit