[PATCH] Make std::enable_shared_from_this cope with ambiguity

[Jonathan Wakely]

On 19/10/16 21:13 +0100, Jonathan Wakely wrote:
> The standard says we have to enable shared_from_this for types with
> an accessible and unambiguous std::enable_shared_from_this base
> class, and we should be able to do that even if the class also has
> an experimental::enable_shared_from_this base class. Now we can.

This adds some more checks for that case.

Tested x86_64-linux, committed to trunk.


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