{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"if"}]}
            if ty.is_mutable_ptr() {
            compress(dict, DictKey::Ty(Ty::new_imm_ref(tcx, *region, *ty0), TyQ::None), &mut s);
                s = format!("{}{}", "U3mut", s);