syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"Res::Def(DefKind::Ctor(CtorOf::Variant,"}]}
source_snippet:             Res::Def(DefKind::Ctor(CtorOf::Variant, ..), variant_ctor_id) => {
context_before:         let res = match res {
context_after:                 let variant_id = self.tcx.parent(variant_ctor_id);