backtrackParse method
Implementation
int backtrackParse(List<int> stack, int stack_top, IntSegmentedTuple action,
int initial_token) {
stateStackTop = stack_top;
ArrayList.copy(stack, 0, stateStack, 0, stateStackTop + 1);
// assert(this.action == action);
return backtrackParseInternal(action, initial_token);
}