Functional error handling

FunctionalErrorHandling.cs

using System;
using System.Collections.Generic;
using System.Linq;
using FSharpx;
using Microsoft.FSharp.Core;
using NUnit.Framework;

namespace FunctionalErrorHandling
{
    public static class Extensions
    {
        public static Func<Unit, T> AddArg<T>(this Func<T> f)
        {
            return _ => f();
        }

        public static FSharpChoice<T, Exception> Try<T>(this Func<T> f)
        {
            return f.AddArg().Try()(null);
        }
    }

    public class Try
    {
        public static FSharpChoice<T, Exception> Func<T>(Func<T> f)
        {
            return f.Try();
        }
    }

    public class TryTests
    {
        private static readonly int Zero = 0;

        [Test]
        public void Try_does_not_throw()
        {
            Try.Func(() => 3/Zero);
        }

        [Test]
        public void Select_does_not_throw()
        {
            Try.Func(() => 3).Select(x => x/Zero);
        }
    }
}

FSharpChoice isn't suitable for exception handling as is, because FSharpChoice.Select throws when Try.Select shouldn't.

/cc @mausch

what's the error?

ok I can reproduce.

After looking at this I'm not really sure if it is by design.
Maybe @mausch knows more.