feat: 支持 to_string 与错误栈

crates/oxide_vm/src/builtins/function.rs

@@ -158,3 +158,14 @@ pub fn function_bind(vm: &mut Vm, args: &[u8]) -> NativeResult {
 
     Ok(JsValue::from_js_object(wrapper))
 }
+
+pub fn function_to_string(vm: &mut Vm, args: &[u8]) -> NativeResult {
+    let name = vm.kernel().string_forge().lookup(vm.reg(args[0]).as_string_index()).unwrap_or_default();
+    let result = if name.is_empty() {
+        "function () { [native code] }".to_string()
+    } else {
+        format!("function {}() {{ [native code] }}", name)
+    };
+    let si = vm.kernel().string_forge().intern(&result).0;
+    Ok(JsValue::string(si, 0))
+}