Validate method substitution before definition updates and execution

crates/core/src/README.md

@@ -7,7 +7,7 @@
 | [lib.rs](lib.rs) | VM 类型导出、objects 类型兼容重导出（含 ReadAccess/CallSignature/CallType/CallEffect）、宿主调用与字节码 rustdoc 示例 |
 | [vm.rs](vm.rs) | Vm 拥有 ObjectStore 与错误位置记录；对象操作和宿主 new_class 和显式Trait注册/关系查询显式委托给 objects；函数／字段检查统一开关、统一参数区间查询与函数类型配置 |
 | [frame.rs](frame.rs) | EndorFrame、栈条目、源码与原生委托返回契约执行根、执行位置元数据、ExecutionLimits |
-| [eval.rs](eval.rs) | execute／call、只读调用与依赖结果、参数绑定、原生实现前数量/类型/效果检查和委托返回检查、可选注解检查、源码类字段环境绑定、帧切换、取指分派、MakeFunction、结果根转移与失败清理 |
+| [eval.rs](eval.rs) | execute／call、只读调用与依赖结果、参数绑定、原生实现前数量/类型/效果检查和委托返回检查、可选注解/动态覆写兼容检查、源码类字段环境绑定、帧切换、取指分派、MakeFunction、结果根转移与失败清理 |
 
 ## 常见修改入口
 

crates/core/src/eval.rs

@@ -166,14 +166,29 @@ impl Vm {
         for value in arguments {
             self.validate_value(value)?;
         }
+        let receiver = arguments
+            .first()
+            .or_else(|| {
+                if required == 0 {
+                    data.defaults().first()
+                } else {
+                    None
+                }
+            })
+            .and_then(|value| match value {
+                Value::Object(receiver) => Some(*receiver),
+                _ => None,
+            });
+        if self.source_type_checks
+            && let Some(receiver) = receiver
+        {
+            self.objects
+                .check_method_override_call(function, receiver)?;
+        }
         let mut return_type = None;
         if self.source_type_checks
             && let Some(signature) = executable.source_signature()
         {
-            let receiver = arguments.first().and_then(|value| match value {
-                Value::Object(object) => Some(*object),
-                _ => None,
-            });
             for (index, expected_name) in signature.parameters.iter().enumerate() {
                 let value = arguments
                     .get(index)
@@ -262,6 +277,12 @@ impl Vm {
         for argument in arguments {
             self.validate_value(argument)?;
         }
+        if self.source_type_checks
+            && let Some(Value::Object(receiver)) = arguments.first()
+        {
+            self.objects
+                .check_method_override_call(function, *receiver)?;
+        }
         if let Some(arity) = self.objects.call_arity(function)?
             && !arity.accepts(arguments.len())
         {