code: @Nonnull
    @ReturnsMutableCopy
    public static <ELEMENTTYPE> NonBlockingStack <ELEMENTTYPE> newStack (@Nullable final ELEMENTTYPE aValue)
    {
      final NonBlockingStack <ELEMENTTYPE> ret = newStack ();
      ret.push (aValue);
      return ret;
    }
docs: Create a new stack with a single element.
  
  @param <ELEMENTTYPE>
  The type of elements contained in the stack.
  @param aValue
  The value to push. Maybe <code>null</code>.
  @return A non-<code>null</code> stack.