Ruta - Optional First Token Problem

[Armin.Wegner]

Hi!

In Ruta 2.0.2-SNAPSHOT, rules with an optional first element do not work. The 
optional part seems to be mandatory. Using

DECLARE Test;
"a"? "b" "c"{->MARK(Test, 1, 3)};

on

a b c x b c

marks "a b c" (0, 5) but not "b c" (8, 11).

Cheers,
Armin