LastOrDefaultAsync<TSource>
using System.Runtime.CompilerServices;
namespace System.Reactive.Linq.ObservableImpl
{
    [System.Runtime.CompilerServices.NullableContext(1)]
    [System.Runtime.CompilerServices.Nullable(0)]
    internal static class LastOrDefaultAsync<[System.Runtime.CompilerServices.Nullable(2)] TSource>
    {
        [System.Runtime.CompilerServices.Nullable(new byte[] {
            0,
            2,
            1,
            0
        })]
        internal sealed class Sequence : Producer<TSource, Sequence._>
        {
            [System.Runtime.CompilerServices.Nullable(new byte[] {
                0,
                1,
                2
            })]
            internal sealed class _ : Sink<TSource, TSource>
            {
                [System.Runtime.CompilerServices.Nullable(2)]
                private TSource _value;
                public _([System.Runtime.CompilerServices.Nullable(new byte[] {
                    1,
                    2
                })] IObserver<TSource> observer)
                    : base(observer)
                {
                }
                public override void OnNext(TSource value)
                {
                    _value = value;
                }
                public override void OnError(Exception error)
                {
                    _value = default(TSource);
                    ForwardOnError(error);
                }
                public override void OnCompleted()
                {
                    TSource value = _value;
                    _value = default(TSource);
                    ForwardOnNext(value);
                    ForwardOnCompleted();
                }
            }
            private readonly IObservable<TSource> _source;
            public Sequence(IObservable<TSource> source)
            {
                _source = source;
            }
            [return: System.Runtime.CompilerServices.Nullable(new byte[] {
                1,
                0
            })]
            protected override _ CreateSink([System.Runtime.CompilerServices.Nullable(new byte[] {
                1,
                2
            })] IObserver<TSource> observer)
            {
                return new _(observer);
            }
            protected override void Run([System.Runtime.CompilerServices.Nullable(new byte[] {
                1,
                0
            })] _ sink)
            {
                sink.Run(_source);
            }
        }
        [System.Runtime.CompilerServices.Nullable(new byte[] {
            0,
            2,
            1,
            0
        })]
        internal sealed class Predicate : Producer<TSource, Predicate._>
        {
            [System.Runtime.CompilerServices.Nullable(new byte[] {
                0,
                1,
                2
            })]
            internal sealed class _ : Sink<TSource, TSource>
            {
                private readonly Func<TSource, bool> _predicate;
                [System.Runtime.CompilerServices.Nullable(2)]
                private TSource _value;
                public _(Func<TSource, bool> predicate, [System.Runtime.CompilerServices.Nullable(new byte[] {
                    1,
                    2
                })] IObserver<TSource> observer)
                    : base(observer)
                {
                    _predicate = predicate;
                }
                public override void OnNext(TSource value)
                {
                    bool flag = false;
                    try {
                        flag = _predicate(value);
                    } catch (Exception error) {
                        _value = default(TSource);
                        ForwardOnError(error);
                        return;
                    }
                    if (flag)
                        _value = value;
                }
                public override void OnError(Exception error)
                {
                    _value = default(TSource);
                    ForwardOnError(error);
                }
                public override void OnCompleted()
                {
                    TSource value = _value;
                    _value = default(TSource);
                    ForwardOnNext(value);
                    ForwardOnCompleted();
                }
            }
            private readonly IObservable<TSource> _source;
            private readonly Func<TSource, bool> _predicate;
            public Predicate(IObservable<TSource> source, Func<TSource, bool> predicate)
            {
                _source = source;
                _predicate = predicate;
            }
            [return: System.Runtime.CompilerServices.Nullable(new byte[] {
                1,
                0
            })]
            protected override _ CreateSink([System.Runtime.CompilerServices.Nullable(new byte[] {
                1,
                2
            })] IObserver<TSource> observer)
            {
                return new _(_predicate, observer);
            }
            protected override void Run([System.Runtime.CompilerServices.Nullable(new byte[] {
                1,
                0
            })] _ sink)
            {
                sink.Run(_source);
            }
        }
    }
}