template constructor overload problems

[Paolo Carlini]

Peter Dimov wrote:
> You need to add
>
> template <typename UElements>
>    tuple (tuple<UElements>& foo)
>    { static_assert(!sizeof(UElements), "third constructor"); }
Many thanks to you and Pedro, of course. For now I committed to mainline
the below, which seems a net improvement to me... Tested x86_64-linux.

Paolo.

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