{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
            let dspan = DelimSpan::from_pair(pspan.shrink_to_lo(), bspan.shrink_to_hi());
            let tokens = TokenStream::new(vec![params, arrow, body]);
            P(DelimArgs { dspan, delim: Delimiter::Brace, tokens })