[plt-scheme] Lazy evaluation and tail calls

> Right now, I've got a very bare bones Scheme and I'm more interested in
> algorithms for optimising stuff rather than tools in a specific language.
> (Also I've just started learning Scheme, and while my current implementation
> is in Ruby I imagine it will flesh out so I can do more stuff in Scheme
> directly.) My runtime just lets you start it up in lazy or eager mode;
> there's no provision in the language itself for delaying execution.
>


By the way, in case it's of any interest at all, my project is on Github at
http://github.com/jcoglan/heist.
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