RFC: __FUNCTION__ and __PRETTY_FUNCTION__

[Neil Booth]

Nathan Sidwell wrote:-

> 1) If this is removed, then it must be done via deprecation in 3.1
> and removal in 3.2
> 2) More heads need to consider the impact of such a change

There's still time to deprecate it in 3.0.3.  I can submit a patch to
warn when __FUNCTION__ or __PRETTY_FUNCTION__ is concatenated with
something else, and update the docs too.

Neil.