{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"//"}]}
        // encoding `ExpnData` for proc-macro crates.
        // `rustc_span::hygiene::raw_encode_expn_id` to handle
        let ctxt = if s.is_proc_macro { SyntaxContext::root() } else { self.ctxt };