{"ast_node_type":"variable","tokens":[{"end":97,"kind":"keyword","start":0,"text":"let"}]}
            let mut err = self.dcx().struct_span_err(lo.to(hi), "use of deprecated `try` macro");
            self.bump(); //remove )
            err.note("in the 2018 edition `try` is a reserved keyword, and the `try!()` macro is deprecated");