Alan Mackenzie wrote:

> In C, we have the very useful conditional compilation
> directives introduced by #if or #ifdef, etc., which end at
> #end.

Those are directives to the C preprocessor and some people say
it is a sign of weakness such a thing is even necessary to
begin with.

Let's see if they are right!

What problem do you have? If we can solve it in Elisp, we
cannot say those people saying that are wrong.