{"ast_node_type":"variable","tokens":[{"end":91,"kind":"keyword","start":0,"text":"let"}]}
        let disambiguator = if ident.name == kw::Underscore { disambiguator() } else { 0 };
    ) -> BindingKey {
        BindingKey { ident: Macros20NormalizedIdent::new(ident), ns, disambiguator }