Improve insert/emplace robustness to self insertion

[Jonathan Wakely]

On 02/07/16 08:37 +0200, François Dumont wrote:
>I haven't consider in this patch your remark about using allocator to 
>build instance so don't hesitate to commit what you want and I will 
>rebase.

Here's what I've committed to trunk.

I'm getting nervous about the smart insertion trick to avoid making a
copy, I have a devious testcase in mind which will break with that
change. I'll share the testcase later today.


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