[PATCH] Additional tests for assign

[Paolo Carlini]

Benjamin Kosnik wrote:

> > Ok?
>
> Great.

Thanks Benjamin. Before committing it, however, I'd like to hear the opinions of
the list on that strange line of _M_mutate. Perhaps _M_mutate should be
(slightly) changed and those two additional testcases are not so important.

By the way: what's happening to the compiler? I sees dozens of failures
everywhere and we cannot check our libstdc++-v3 changes with a three-four
days-old compiler forever ;-) ...

Cheers,
Paolo.