Wrong coverage for "await foreach" when method is generic

I’m using coverlet.msbuild v3.1.0 (and tried also with the current nightly build) and there is an uncovered statement reported.

I tried to reproduce it but I didn’t managed to get an reproduction. Any ideas what the problem could be and how I can provide an reproduction?

public class AsyncForeachReproduction
{
    private static async IAsyncEnumerable<int> RangeAsync(int start, int count)
    {
        for (int i = 0; i < count; i++)
        {
            await Task.Delay(i);
            yield return start + i;
        }
    }

    public async Task Execute()
    {
        await foreach (var a in RangeAsync(1, 5))
        {
            Console.WriteLine(a);
            await Task.CompletedTask;
        }

        await Task.CompletedTask;
    }
}

[daveMueller]

I started working on this issue.

[MarcoRossignoli]

The code in the repro and the code that is failing are a lot different from compiler perspective, state machine are built in a different way because different object structure are involved(different nesting, visibility, different relationship between objects…different optimization)…you should create the same classes, mock those and retry.

Try to compare those with ILSpy and you’ll see that the emitted IL is different.