Ryan Ofsky 6d43aad742 span: Make Span template deduction guides work in SFINAE context ...

Also add test to make sure this doesn't get broken in the future.

This was breaking vector<bool> serialization in multiprocess code because
template current deduction guides would make it appear like vector<bool> could
be converted to a span, but then the actual conversion to span would fail.

2023-10-20 10:30:16 -04:00

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