This simple copy_term call seems to loop infinitely and produce no answers:
This is my xsb --version output:
XSB Version 3.3.7 (Pignoletto) of August 12, 2012
[i386-apple-darwin12.3.0 64 bits; mode: optimal; engine: slg-wam; scheduling: local]
[Patch date: 2012/08/12 15:03:17]
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