Method placeholder

source/python.js:8952–8956

(name, type_expr /*, default_value */)

                return array;
            }
            placeholder(name, type_expr /*, default_value */) {
                const args = []; // () if default_value is inspect.Signature.empty else (default_value,)
                const kwargs = new builtins.dict();
                return this.create_node('placeholder', name, args, kwargs, type_expr);
            }
            create_node(op, target, args, kwargs, name, type_expr) {
                args = args || new builtins.tuple();
                kwargs = kwargs || new builtins.dict();