{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"_span:"}]}
    _span: crate::tt::Leaf => self { self };
    span: bool => self { crate::tt::Ident{sym: if self { sym::true_ } else { sym::false_ }, span, is_raw: tt::IdentIsRaw::No } };
    _span: crate::tt::Literal => self { self };