[v3] 9371/9546/10093/10095

[Benjamin Kosnik]

>The effects clause for setstate() seems to require that the second
>call call to setstate() should call clear(), which should throw an
>exception. Am I missing something?

No, it's just counter-intuitive to call setstate with goodbit. At
least it was for me... also, trying to avoid the if (__err) bits. Oh well.

I fixed this part up, thanks.

The rest is a mess. I don't agree with your interpretation here, but
will get to that tomorrow. It would be nice to have consistent error
reporting with both inserters and extractors for streambufs.

best,
benjamin