Select/ToAsyncEnumerable/Take/ToList issue (in 3.0; fixed in 3.1.0-rc)

[jskeet]

I wanted to report this just in case it bites anyone else. I haven't tried to diagnose what's at fault yet, but it definitely looks like a bug to me.

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public static void Main(string[] args)
    {
        var list = new[] { "a", "b", "c" }
            .Select(x => x.ToUpper())
            .ToAsyncEnumerable()
            .Take(2)
            .ToList()
            .Result;
        
        foreach (var item in list)
        {
            Console.WriteLine($"item={item}; null? {item==null}");
        }
    }
}

Expected output:

item=A; null? False
item=B; null? False

Actual output:

item=A; null? False
item=; null? True

If you remove either the Select or the Take call, it's fine.

[clairernovotny]

@jskeet can you confirm this is fixed in the 3.1-rc? It's not a specifically known issue otherwise.

EDIT: nightly feed info here

[jskeet]

Yes, it works fine in 3.1.0-rc

[clairernovotny]

Thanks, will close as fixed then.