/// <summary>
/// Appends the results of each result sequence from the specified <paramref name="parser"/> into an <see cref="IList{TResult}"/>.
/// </summary>
/// <typeparam name="TSource">The type of the source elements.</typeparam>
/// <typeparam name="TResult">The type of the elements that are generated by the parser.</typeparam>
/// <param name="parser">The parser that produces a sequence of result sequences to be aggregated.</param>
/// <returns>A parser that returns the results aggregated into an <see cref="IList{TResult}"/>.</returns>
public static IObservableParser <TSource, IList <TResult> > ToList <TSource, TResult>(
this IObservableParser <TSource, IObservable <TResult> > parser)
{
Contract.Requires(parser != null);
Contract.Ensures(Contract.Result <IObservableParser <TSource, IList <TResult> > >() != null);
return(parser.Aggregate(
() => new List <TResult>(),
(list, result) =>
{
list.Add(result);
return list;
},
list => (IList <TResult>)list.AsReadOnly()));
}