{"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"s.push('E');"}]}
            s.push('E');
            s.push_str(&encode_ty(tcx, *ty0, dict, options));
            compress(dict, DictKey::Ty(Ty::new_imm_ref(tcx, *region, *ty0), TyQ::None), &mut s);