{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"ty::Ref(reg,"}]}
                ty::Ref(reg, ref_ty, mutability) if i == 0 => {
                ty::Param(_) if assoc.is_method() && i == 0 => "self".to_string(),
                    let reg = format!("{reg} ");