public static Parser <TToken, IEnumerable <T> > EndBy1 <TToken, T>(
this Parser <TToken, T> parser,
Parser <TToken, Unit> sep)
{
/*
* return InternalCombinator.EndBy1(parser, sep)
* .Select(delayedSeq => delayedSeq.AsEnumerable());
*/
return(InternalCombinator.EndBy1_Optimized(parser, sep));
}