error CS1674: 'void': type used in a using statement must be implicitly convertible to 'System.IDisposable'

the following code fails on .net core 1.1 (in a controller):

public async Task<string> testAsync([FromServices] IManagedTracer tracer)
{
            using (tracer.StartSpan(nameof(testAsync)))
            {
...
            }
}

compile error: error CS1674: 'void': type used in a using statement must be implicitly convertible to 'System.IDisposable'

the documentation says we can use it: http://googlecloudplatform.github.io/google-cloud-dotnet/docs/Google.Cloud.Diagnostics.AspNetCore/ Am I missing something?

(sorry to spam issues)

[jskeet]

@Jonathan34: I’d love to take credit for it being a really quick fix, but I spent many hours today sorting out the release - it was almost all ready by the time this was raised 😃

[jskeet]

I suspect this is a matter of the documentation being ahead of the released libraries. I’m in the middle of preparing a release (the first for a few weeks). If you can hold off a little while, this may just fix itself…