Patch preview: libstdc++/34730

[Paolo Carlini]

Hi,

I'm working on this interesting issue, and I'm under the impression
that, overall, we cannot have an optimal result - in terms of strictness
of the testing while not breaking conforming code (probably concepts
would be, in some areas). My best idea so far, is limiting the testing
to when the two involved input iterator types have the same value_type,
per the below, which I'm finishing testing (and maybe cleaning a bit
more). Are there any better suggestions? Otherwise, I will just go ahead
like this, at least for 4.3.

Thanks,
Paolo.

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