syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"ty::Alias(ty::Opaque,"}]}
source_snippet:             ty::Alias(ty::Opaque, alias_ty) if alias_ty.def_id.is_local() => {
context_before:         match *t.kind() {
context_after:                 self.visit_opaque_ty(alias_ty);