SRFI-46 in example section show macro: all-symbols that I would like to test
in my Scheme implementation. It uses two macros with a note:

> The next example uses two other macros that we don't define here

I've found the syntax-symbol? macro on [Scheme Wiki][1] with link to [Oleg
Kiselyov website][2]

But where can I find definition of UNION macro?

[1]: http://community.schemewiki.org/?syntax-symbol%3f
[2]: http://okmij.org/ftp/Scheme/macros.html#macro-symbol-p

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Jakub T. Jankiewicz, Web Developer
https://jcubic.pl/me