On Mon, Nov 11, 2019 at 8:27 PM Steve Johnson <scj@yaccman.com> wrote:

I recall that someone wrote a Lisp compiler entirely in macros, and it would regularly recurse several hundred levels deep while generating code.

T'was before my time, but the legend has it that the original BLISS-10 bootstrap compiler was a set of TECO macros that Chuck Geschke (Adobe's founder) wrote.