syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"Res::Def(DefKind::Ctor(CtorOf::Variant,"}]}
source_snippet:             Res::Def(DefKind::Ctor(CtorOf::Variant, _), def_id) => {
context_before:         match res {
context_after:                 Some(self.parent(self.parent(def_id)))