syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"($($t:ty),+"}]}
source_snippet:         ($($t:ty),+ $(,)?) => {$(
context_before:     macro_rules! impl_dep_tracking_hash_via_hash {
context_after:             impl DepTrackingHash for $t {