{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"//"}]}
            // `1f64` and `2f32` etc. are valid float literals, and
            sym::u128 => ast::LitIntType::Unsigned(ast::UintTy::U128),
            // `fxxx` looks more like an invalid float literal than invalid integer literal.