[fadmmatt]

That's a good question, actually.

Lisp macros need knowledge of the structure of the s-expression.

Certainly one can Church encode s-expressions and provide defmacro.

Gensym is trickier. Hygiene might be really challenging.

I might actually try that out.

(/article author)

[akkartik]

"Lisp macros need knowledge of the structure of the s-expression."

I recently rediscovered this for myself: http://arclanguage.org/item?id=11880