{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":".with_type_param_mode(ParamLoweringMode::Variable);"}]}
    .with_type_param_mode(ParamLoweringMode::Variable);
    )
    let (self_ty, binders) = db.impl_self_ty(impl_id).into_value_and_skipped_binders();