{"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"(<$tcx:tt>"}]}
    (<$tcx:tt> $($ty:ty,)*) => {
macro_rules! impl_ref_decoder {
        $(impl<'a, $tcx> Decodable<CacheDecoder<'a, $tcx>> for &$tcx [$ty] {