syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"(ty::GenericArgKind::Lifetime(a_lt),"}]}
source_snippet:             (ty::GenericArgKind::Lifetime(a_lt), ty::GenericArgKind::Lifetime(b_lt)) => {
context_before:         match (a.kind(), b.kind()) {
context_after:                 Ok(relation.relate(a_lt, b_lt)?.into())