Improve insert/emplace robustness to self insertion

Tue Jul 12 14:04:00 GMT 2016

On 08/07/16 17:38 +0100, Jonathan Wakely wrote:
>On 06/07/16 21:46 +0200, FranÃ§ois Dumont wrote:
>>Don't you plan to add it to the testsuite ?
>
>Done with the attached aptch.

Just for completeness, I'm also adding the example from LWG 2164,
which is related.

Tested x86_64, committed to trunk.

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