I found that as well, but it is not what inetsee described in his post.

I was interested specifically in "using Racket's macro system to implement a slight variation of Algol 60", which is not what that section or the Racket guide section on macros [0] does.

It's not clear what was meant by "the Racket tutorial".

[0] http://docs.racket-lang.org/guide/macros.html