null-environment 0

Hello,

I discovered that SISC returns an empty environment when calling
(null-environment 0). did not see this documented anywhere, and I was
wondering if this behavior is guaranteed to remain in future releases.

I'm finding the null-environment 0 particularly useful in modeling an
"interaction tree" for SISCweb as defined in the paper
_Interaction-Safe State for the Web_. [*] I hope it's here to stay.

Thanks,
___
Alessandro

[*] http://library.readscheme.org/servlets/cite.ss?pattern=McCarthySK-Scheme2006

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