[bsder]

So, you're passing around textual source code chunks? How do you force evaluation?

I don't find this impossible. I have seen this in John Shutt's Kernel, for example. https://ftp.cs.wpi.edu/pub/techreports/pdf/05-07.pdf

But I'm just not seeing the mechanisms I expect for such a language.

[RodgerTheGreat]

Not strings; token lists.

You can evaluate lists with `do`, or through functions which in turn use `do` on their arguments.