Hi Eduardo, You might find the following useful or interesting:
http://planet.racket-lang.org/package-source/dyoo/infix.plt/1/1/doc.txt
In particular, the implementation's in the private subdirectory:
http://planet.racket-lang.org/package-source/dyoo/infix.plt/1/1/private/
The code is a little stale (I wrote it several years ago), but it
might still have some utility for you.
Good luck!
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