public boolean match(MatcherContext context) {
int lastIndex = context.getCurrentIndex();
Object valueStackSnapshot = context.getValueStack().takeSnapshot();
if (!subMatcher.getSubContext(context).runMatcher()) return false;
// reset location, Test matchers never advance
context.setCurrentIndex(lastIndex);
// erase all value stack changes the the submatcher could have made
context.getValueStack().restoreSnapshot(valueStackSnapshot);
return true;
}
