MemberInfo.DeclaringType上出现奇怪的Resharper警告

MemberInfo

abstract

null

class EvilMemberInfo : MemberInfo
{
    public override System.Type DeclaringType
    {
        get { return null; }
    }

    // Rest omitted for brevity
}

// System.Reflection.MemberInfo
public virtual Type DeclaringType
{
    get
    {
        Contract.Ensures(Contract.Result<Type>() != null, null, \"Contract.Result<Type>() != null\");
        Type result;
        return result;
    }
}