syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"ty::AliasTermKind::OpaqueTy"}]}
source_snippet:                 ty::AliasTermKind::OpaqueTy => relate_args_with_variances(
context_before:             let args = match a.kind(relation.cx()) {
context_after:                     relation,