No warning on uninitialized static non-nullable fields?

[stephentoub]

Version Used:
3.0.0-beta4-19170-01+1deafee3682da88bf07d1c18521a99f47446cee8

Repro:

#nullable enable
using System;

class Program
{
    private static object s_foo;

    static void Main() => Console.WriteLine(s_foo.GetHashCode());
}

There's no warning here, but it will obviously null ref. Shouldn't there be a warning for a non-nullable static field that's not initialized as part of the declaration or a static cctor?

cc: @cston, @jaredpar, @danmosemsft, @dotnet/nullablefc