append method

@override Tuple2<T1, T2> append(Tuple2<T1, T2> t1, Tuple2<T1, T2> t2)

Implementation

@override Tuple2<T1, T2> append(Tuple2<T1, T2> t1, Tuple2<T1, T2> t2) =>
    new Tuple2<T1, T2>(_value1Semigroup.append(t1.value1, t2.value1), _value2Semigroup.append(t1.value2, t2.value2));