{"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"(<$tcx:tt>"}]}
    (<$tcx:tt> $($ty:ty,)*) => {
macro_rules! impl_arena_copy_decoder {
        $(impl<'tcx, D: TyDecoder<'tcx>> RefDecodable<'tcx, D> for $ty {