{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"UpvarNode(s)"}]}
        UpvarNode(s) => format!("Upvar node [{}]", sm.span_to_diagnostic_string(s)),
    match lnk {
        ExprNode(s, _) => format!("Expr node [{}]", sm.span_to_diagnostic_string(s)),