bug#68075: 30.0.50; New special form `handler-bind`

[Ihor Radchenko]

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

> I'm trying to explain that when looking for a handler, we look both for
> condition-case handler and handler-bind handlers and we use whichever is
> "closest", i.e. more deeply nested.  So just like a local
> `condition-case` overrides temporarily an outer one, the same holds not
> only among `handler-bind`s but also between `condition-case` and
> `handler-bind` as well.

Then, it would also make sense to make `condition-case' and
`handler-bind' refer to each other from the docstrings.

-- 
Ihor Radchenko // yantar92,
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