+=item C<directives($bench, @directive)>
+
+Format the list of directives for Bison for bench named C<$bench>.
+
+=cut
+
+sub directives($@)
+{
+ my ($bench, @directives) = @_;
+ my $res = "/* Directives for bench `$bench'. */\n";
+ $res .= join ("\n", @directives);
+ $res .= "/* End of directives for bench `$bench'. */\n";
+ return $res;
+}
+
+=item C<triangular_grammar ($base, $max, @directives)>