Sorry, but I have to agree with Philo. Whatever those dictionaries may say, I don't think most speakers would really consider it good usage...
Well, what is 'good usage'? English is constantly evolving; what is completely unacceptable to one generation is fine for the next. In my own personal speech and writing, I tend to be rather formal and, to some people, old-fashioned. I don't, for example, like "Shop Ebay". However, whether I like it or not, it is being used today, and who am I to say it is wrong? The fact that it is now noted in dictionaries suggests that it is becoming widely used,
As for analysis of non-standard usage, my own feeling is that if native speakerss say something that is understood by others, then it is worthy of analysis. That some self-appointed experts decree that it is 'not standard' is not very important, though, if there appears to be general agreement that something is non-standard, then this needs to be pointed out to learners. As I have said in other threads, I agree wholeheartedly with Frank: "Nonstandard usage often offends some ears, but it still carries meaning"!
I am not, as Frank knows, a fan of Reed-Kellogg. In fact, I rarely agree with Frank's views on language. But, and this is an important 'but', my opinions, like Frank's and philo's, are just that - opinions. If someone says, "The issue for me is, essentially, that by consenting to diagram/analyse nonstandard sentences without emendation, we are tacitly expressing our acceptance of them, and thereby ultimately doing our visitors here something of a disservice", I simply wonder how we can be doing a disservice to learners by accepting that some native speakers say/write thing that we, personally, would not.
ps. The 'EOT' that ends post #8 is not exactly standard usage. I am not sure which of
these it is meant to represent.