public interface Sealed2<T1,T2>
<R> R
fold(java.util.function.Function<? super T1,? extends R> fn1, java.util.function.Function<? super T2,? extends R> fn2)
<R> R fold(java.util.function.Function<? super T1,? extends R> fn1, java.util.function.Function<? super T2,? extends R> fn2)