/// <summary>
/// Indicates a successful parse operation without actually parsing by yielding the specified scalar <paramref name="result"/>.
/// </summary>
/// <typeparam name="TSource">The type of the source elements.</typeparam>
/// <typeparam name="TIntermediate">The type of the elements that are generated from parsing the source elements.</typeparam>
/// <typeparam name="TResult">The type of the <paramref name="result"/>.</typeparam>
/// <param name="parser">The parser for which the specified <paramref name="result"/> indicates success.</param>
/// <param name="result">The value of the created parser's result.</param>
/// <returns>A parser that always returns the specified scalar <paramref name="result"/> with a length
/// of zero, starting from the index at which the specified <paramref name="parser"/> starts.</returns>
public static IObservableParser <TSource, TResult> Success <TSource, TIntermediate, TResult>(
this IObservableParser <TSource, TIntermediate> parser,
TResult result)
{
Contract.Requires(parser != null);
Contract.Ensures(Contract.Result <IObservableParser <TSource, TResult> >() != null);
return(parser.Success(result, length: 0));
}