{"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
            let parent = paren.as_ref().and_then(|it| it.parent()).unwrap_or(parent);
                parent.ancestors().take_while(|it| ast::ParenType::can_cast(it.kind())).last();
            if ast::TypeBound::can_cast(parent.kind())