After reading <a href="http://blog.plt-scheme.org/2007/07/control-resumed.html">http://blog.plt-scheme.org/2007/07/control-resumed.html</a> I decided to look into prompt/control/%/fcontrol and the rest of the goodies in control.ss So based on the example from the blog post I did this python like snippet. ================ (require (lib "control.ss")) (define (make-step)   (define (body)     (yield 1)     (yield 2)     (yield 3)     'finished)   (define (yield value) (control resume-here (set! _body_ resume-here) value))   (define (generator) (prompt (body)))   (generator)) ================ I decided to look into turning it into a macro, such that the following ends up being correct code ============== (define/y (step)   (yield 1)   (yield 2)   (yield 3)   'finished) ============== My problem is that I don't know how to define yield as a macro inside the define/y scope, since it need to be able to access _body_, which is a defined in define/y. All I come up with are various non-hygienic (and simply broken) variations. Can you point me to some examples doing something similar (and/or relevant docs). I know that there is generator.ss in planet, but for me this is a nice exercise, since I'm trying to build some intuition about scheme macros. I was avoiding them for too long... Cheers, Vlado