{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
            let pat = this.parse_pat_no_top_alt(Some(Expected::ParameterName), None)?;
        self.collect_tokens(None, attrs, ForceCollect::No, |this, attrs| {
            let ty = if this.eat(exp!(Colon)) {