{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"let"}]}
            let field_list = ctx.find_node_at_offset::<ast::TupleFieldList>()?;
            let field = ctx.find_node_at_offset::<ast::TupleField>()?;
            let field_list_index = field_list.fields().position(|it| it == field)?;