Re: Dealing with obsoletion warnings in non-core code

[Vasilij Schneidermann]

> What about something like the below?
> 
>   (if (> emacs-major-version NN)
>     (defun recommended-function (...)
>       ...))

You don't want a third-party package defining a potentially
non-conformant version of future built-in functionality (for example if
they take the definition from a specific Emacs version and it changes in
another one).  Users could mistake that for the real one.  Shimming may
be acceptable in a JavaScript world, but remember, they have invented
fixes to lack of namespacing and modules and we haven't, so their damage
from a package is global.

Besides, isn't the logic the wrong way around?  The recommended function
is something available in a newer Emacs version, so you'd test for an
older one and if the check is positive, define the shim.  Assuming you
can even, some functionality cannot be backported that easily.

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