Add fallback dispatcher for missing renderers.

1 files changed, 11 insertions, 3 deletions

diff --git a/mingling_macros/src/chain.rs b/mingling_macros/src/chain.rs
index a7be233..9ef4ae0 100644
--- a/mingling_macros/src/chain.rs
+++ b/mingling_macros/src/chain.rs
@@ -125,10 +125,18 @@ pub fn chain_attr(item: TokenStream) -> TokenStream {
     let chain_entry = quote! {
         #struct_name => #previous_type,
     };
+    let chain_exist_entry = quote! {
+        id if id == std::any::TypeId::of::<#previous_type>() => true,
+    };
     let mut chains = crate::CHAINS.lock().unwrap();
-    let entry = chain_entry.to_string();
-    if !chains.contains(&entry) {
-        chains.push(entry);
+    let mut chain_exist = crate::CHAINS_EXIST.lock().unwrap();
+    let chain_entry = chain_entry.to_string();
+    let chain_exist_entry = chain_exist_entry.to_string();
+    if !chains.contains(&chain_entry) {
+        chains.push(chain_entry);
+    }
+    if !chains.contains(&chain_exist_entry) {
+        chain_exist.push(chain_exist_entry);
     }
 
     expanded.into()