{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"let"}]}
                let (generics_def_id, index) = if let Some(self_ty) = self_ty {
            DefKind::Ctor(CtorOf::Variant, ..) | DefKind::Variant => {
                    let adt_def = self.probe_adt(span, self_ty).unwrap();