Ruta: Missing matches with dynamic anchoring

Dynamic anchoring misses matches.

For instance, given the input file

A, B and C.

the following script does not match the input using dynamic anchoring:

PACKAGE test;

DECLARE A,C,ENUM;

CW {-> A};
"and" -> C;

A (COMMA A)* @C A {->MARK(ENUM,1,4)};