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This doesn't sound like Go to me, but I've never used it:

Homoiconic

Code can be manipulated as data.

Extensible syntax

I find I don't use macros much anymore. I do more with data-oriented programming. But it is nice to have when you need it.

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A lot of this list sounds very much like Postscript: * Code is stored in an array with the execute flag turned on. Therefore functions can be easily edited (or assembled) as data. First class functions all the way. * The environment is a dictionary (associative array), which can be swapped with another dictionary at any time (not just at function entry points). * Garbage collection is standard

I was thinking that it may be an interesting project to write a general purpose Postscript (non-graphics oriented) interpreter, with a decent library, full continuation passing support, a different way of handling the "current dictionary" stack (to allow for static in addition to dynamic variable support), and a swappable parser to allow for additional program definition styles (infix or prefix in addition to the default postfix notation). Just something kicking around in the back of my head for a while.

Maybe Factor http://factorcode.org/ is what you want ?

Also, the rather new Red language (Rebol-like) http://www.red-lang.org/ seems interesting.

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