FindAllReferences doesn't find usages of GetAsyncEnumerator in await foreach

[YairHalberstadt]

Version Used: 16.7 preview 2

Steps to Reproduce:

find all references of GetAsyncENumerator in the below code:

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class C
{
    public static async Task Main()
    {
        await foreach (var i in new C())
        {
            Console.Write(i);
        }
    }

    public async IAsyncEnumerator<int> GetAsyncEnumerator() => null;
}

Expected Behavior:
Returns 1 usage in await foreach (this happens for GetEnumerator and foreach)

Actual Behavior:
Finds no usages.

[CyrusNajmabadi]

Closing due to lack of feedback.