diff --git a/App/lib/core/Gen/Call/CallGenCall.vp b/App/lib/core/Gen/Call/CallGenCall.vp
index e621d63..84c5cc0 100644
--- a/App/lib/core/Gen/Call/CallGenCall.vp
+++ b/App/lib/core/Gen/Call/CallGenCall.vp
@@ -398,7 +398,9 @@ novirtual class CallGenCall(CallGenBase.CallGenBase):
             while nn_pn is not None:
                 nn_pc += 1
                 nn_pn = mlirlite.param_get_next(nn_pn)
-            if nn_pc > 1 and extra_count > nn_pc - 1:
+            # nn_pc == 1（只有注入的 self，如 `def __new__() -> 'Vec3' | CPtr`）
+            # 同样要裁：extra_count 归 0，只传 self。
+            if nn_pc >= 1 and extra_count > nn_pc - 1:
                 extra_count = nn_pc - 1
 
         # 构建参数链表: self_ptr → extra_args...