Are you sure that always works?

I think I am misunderstanding Halloway's Taxonomy of Macro's chapter

defstruct is written as a macro and Stuart then comments

"This macro looks so simple that you may be tempted to try to write it
as a function. You won't be able to because def is a special form. You
must generate def at macro time; you cannot make 'dynamic' calls to
def at runtime"

On May 31, 4:05 pm, Joost <jo...@zeekat.nl> wrote:
> On May 31, 4:35 pm, Quzanti <quza...@googlemail.com> wrote:
>
> > That was interesting.
>
> > One more Q.
>
> > What determines whether special forms can be used in functions eg you
> > can't def a variable in a fn.
>
> You can:
>
> user> (defn fun [v] (def my-v v))
> user> (fun 'a)
> user> my-v
> a
> user> (fun 'b)
> user> my-v
> b
>
> I'm not aware of any special form that can't be used inside a
> function.
> But I haven't looked for them either.
>
> > Is it there some rule or is it special form specific depending on
> > (a) the intended use of the special form
> > (b) the mechanics of getting the compiler to use the special form
>
> First you'd have to find such special forms.

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