      \fitem{sort}{(t:tab, cmp:fct)} \vImpure: sorts in-place the elements
      into ascending order.  The elements are compared using the function
      \code{cmp}.  This function must accept two elements of the tab
      \code{t} as arguments, and returns a value converted to bool. The
      value returned indicates whether the element passed as first
      argument is considered to go before the second.



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

