Ed proposed all this, on January 6:

        __cpp_auto_deduction 200604 for C++11
        __cpp_auto_deduction 201411 for C++17
This could be an alternate spelling of|__cpp_return_type_deduction|:
        __cpp_auto_deduction 201304 for C++14

But no one ever commented on his back-filling proposals, and I never added
them to the document.

Feedback please?

Clark