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  my $ctrl = $controls->{$tag};

  if ($ctrl->{"loop"} == 1) {

    # Not done yet.

    _control_error($form, $file_name,

                   $main::locale->text("Dependency loop detected:") .

                   " " . join(" -> ", @path))

  } elsif ($ctrl->{"loop"} == 0) {

    # Not checked yet.

    $ctrl->{"loop"} = 1;

    map({ _check_for_loops($form, $file_name, $controls, $_, @path); }

        @{ $ctrl->{"depends"} });

    $ctrl->{"loop"} = 2;

  }