loop xx = 1 to 10 -- xx is the control variable
  ...
  loop yy = 1 to 10 -- yy is the control variable
    ...
    if yy = 3 then leave xx -- xx loop terminated by leave
    if yy = 4 then leave yy -- yy loop terminated by leave
    ...
    end
    ...
  end xx

loop label xlabel xx = 1 to 10 -- xx is still the control variable but LABEL takes precidence
  ...
  loop yy = 1 to 10 -- yy is the control variable
    ...
    if yy = 3 then leave xlabel -- xx loop terminated by leave
    ...
    end yy
    ...
  end xlabel

do label FINIS
  say 'in do block'
  if (1 == 1) then leave FINIS
  say 'unreachable'
  signal Exception("Will never happen")
catch ex = Exception
  ex.printStackTrace()
finally
  say 'out of do block'
end FINIS

loop vv over ['A', 'B']
  select label selecting case vv
    when 'A' then do; say 'A selected'; say '...'; end
    when 'B' then do;
      say 'B selected';
      if (1 == 1) then leave selecting;
      say '...';
      end
    otherwise do; say 'nl selection'; say '...'; end
    end selecting
  end vv