code: public static <T0, T1> FuncN<Void> fromAction(final Action2<? super T0, ? super T1> f) {
          return new FuncN<Void>() {
  
              @SuppressWarnings("unchecked")
              @Override
              public Void call(Object... args) {
                  if (args.length != 2) {
                      throw new RuntimeException("Action3 expecting 2 arguments.");
                  }
                  f.call((T0) args[0], (T1) args[1]);
                  return null;
              }
  
          };
      }
docs: Converts an {@link Action2} to a {@link FuncN} to allow heterogeneous handling of functions with different arities.
  
  @param f the {@code Action2} to convert
  @return a {@link FuncN} representation of {@code f}