syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ty::GenericArgKind::Lifetime(r)"}]}
source_snippet:                 ty::GenericArgKind::Lifetime(r) => {
context_before:             match arg.kind() {
context_after:                     if matches!(r.kind(), ty::ReBound(ty::INNERMOST, br) if var == br.var()) {