extract empty_arguments_object helper

youknowone · youknowone · commit d4f33c424805 · 2026-02-02T20:08:40.000+09:00
diff --git a/crates/vm/src/stdlib/ast.rs b/crates/vm/src/stdlib/ast.rs
@@ -265,6 +265,22 @@ fn node_add_location(
     .unwrap();
 }
 
+/// Create an empty `arguments` AST node (no parameters).
+fn empty_arguments_object(vm: &VirtualMachine) -> PyObjectRef {
+    let node = NodeAst
+        .into_ref_with_type(vm, pyast::NodeArguments::static_type().to_owned())
+        .unwrap();
+    let dict = node.as_object().dict().unwrap();
+    for list_field in ["posonlyargs", "args", "kwonlyargs", "kw_defaults", "defaults"] {
+        dict.set_item(list_field, vm.ctx.new_list(vec![]).into(), vm)
+            .unwrap();
+    }
+    for none_field in ["vararg", "kwarg"] {
+        dict.set_item(none_field, vm.ctx.none(), vm).unwrap();
+    }
+    node.into()
+}
+
 #[cfg(feature = "parser")]
 pub(crate) fn parse(
     vm: &VirtualMachine,
diff --git a/crates/vm/src/stdlib/ast/expression.rs b/crates/vm/src/stdlib/ast/expression.rs
@@ -330,31 +330,7 @@ impl Node for ast::ExprLambda {
         // Lambda with no parameters should have an empty arguments object, not None
         let args = match parameters {
             Some(params) => params.ast_to_object(vm, source_file),
-            None => {
-                // Create an empty arguments object
-                let args_node = NodeAst
-                    .into_ref_with_type(vm, pyast::NodeArguments::static_type().to_owned())
-                    .unwrap();
-                let args_dict = args_node.as_object().dict().unwrap();
-                args_dict
-                    .set_item("posonlyargs", vm.ctx.new_list(vec![]).into(), vm)
-                    .unwrap();
-                args_dict
-                    .set_item("args", vm.ctx.new_list(vec![]).into(), vm)
-                    .unwrap();
-                args_dict.set_item("vararg", vm.ctx.none(), vm).unwrap();
-                args_dict
-                    .set_item("kwonlyargs", vm.ctx.new_list(vec![]).into(), vm)
-                    .unwrap();
-                args_dict
-                    .set_item("kw_defaults", vm.ctx.new_list(vec![]).into(), vm)
-                    .unwrap();
-                args_dict.set_item("kwarg", vm.ctx.none(), vm).unwrap();
-                args_dict
-                    .set_item("defaults", vm.ctx.new_list(vec![]).into(), vm)
-                    .unwrap();
-                args_node.into()
-            }
+            None => empty_arguments_object(vm),
         };
         dict.set_item("args", args, vm).unwrap();
         dict.set_item("body", body.ast_to_object(vm, source_file), vm)
