      \fitem{is_suffix}(t1:tab, t2:tab, cmp:fct): same as the previous
      version but the function \code{cmp} is used to test the equality
      between the elements, instead of the usual comparison between
      values.  For example:
      \begin{lstlisting}
            @fun_def cmp($x, $y) { $x < $y }
            @is_suffix([1, 2], [5, 6, 7], @cmp) ->true
      \end{lstlisting}
      \code{true} is returned because \code{@cmp(1, 6)} and %
      \code{@cmp(2, 7)} hold. 


      %%% -------------------------------------------------------

