1 files changed, 9 insertions, 0 deletions
diff --git a/src/codegen/mod.rs b/src/codegen/mod.rs
index 515ebf17..c70c1064 100644
--- a/src/codegen/mod.rs
+++ b/src/codegen/mod.rs
@@ -2005,6 +2005,15 @@ impl CodeGenerator for CompInfo {
         let mut derives: Vec<_> = derivable_traits.into();
         derives.extend(item.annotations().derives().iter().map(String::as_str));
 
+        // The custom derives callback may return a list of derive attributes;
+        // add them to the end of the list.
+        let custom_derives;
+        if let Some(cb) = &ctx.options().parse_callbacks {
+            custom_derives = cb.add_derives(&canonical_name);
+            // In most cases this will be a no-op, since custom_derives will be empty.
+            derives.extend(custom_derives.iter().map(|s| s.as_str()));
+        };
+
         if !derives.is_empty() {
             attributes.push(attributes::derives(&derives))
         }