{"ast_node_type":"struct","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
            let msg = format!("expected {where_str}`{{` after struct name, found {token_str}");
            let where_str = if parsed_where { "" } else { "`where`, or " };
            let mut err = self.dcx().struct_span_err(self.token.span, msg);