On Thu, 30 Sep 2004 08:09:27 +0200, "Michael Erdmann"
What happens, that print-hallo is never called if names is empty.
The result is a completly different trace fingerprint which does
not contain the print-hallo procedure at all. This is very confusing.
I missed your original email but what you write above sounds similar to
what is discussed in the following:
http://groups.google.com/groups?selm=7eb8ac3e.0312172046.6d817907%40posting.google.com
http://groups.google.com/groups?selm=7eb8ac3e.0402131819.46d2bbb4%40posting.google.com
http://okmij.org/ftp/Scheme/enumerators-callcc.html
Is the 'choice' you are talking about like 'amb'?