syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"GenericArgKind::Lifetime(region)"}]}
source_snippet:                     GenericArgKind::Lifetime(region) => match region.kind() {
context_before:                 match arg.kind() {
context_after:                         ty::ReEarlyParam(ebr) => {