private GExpansion traverseUniqueChildSequences(GExpansion expansion) {
main:
while (expansion.kind == GExpansion.Kind.Sequence) {
GExpansion child = null;
List<GExpansion> children = expansion.children;
for (int i = 0; i < children.size(); i++) {
GExpansion otherChild = children.get(i);
if ((otherChild.kind != GExpansion.Kind.LookAhead || otherChild.semanticLookahead == null)
&& otherChild.kind != GExpansion.Kind.Action) {
if (child == null) child = otherChild;
else break main;
}
}
expansion = child;
}
return expansion;
}
