Alright, total stream of thought here: Guile is cool, if possibly immature. To this day, the largest project I've done in Guile was the entirety of the exerci

Alright, total stream of thought here: Guile is cool, if possibly immature. To this day, the largest project I've done in Guile was the entirety of the exercises short of Chapter 5 in SICP, wrote unit tests for the interpreter and the 'Prolog' implementation, the whole lot. All told I generated approximately 10KLOC of Guile code, some 20% of it using features like GOOPs, threading, dynamic-unwind and so on. It was largely a positive experience and I am really glad I read ahead and implemented a few things as GOOPs classes rather than used the OOP system described in the Book (particularly for the Constraint Solver!) As part of this, I did run into some faulty code generation (inappropriate optimization) on the master branch while completing an early Chapter 4 exercise: "This code could do multiple things if we apply different models of an idealized computer language (each of which was advocated by 'Susan' and 'Bob' in typical SICP fashion)", I wrote an implementation inside my guile interpreter that got an unusual answer and asked the channel about it and everyone got to the bottom of it fairly quickly. Speaking of which, Guile has a community of absolutely rabid fans all over the world and so the support in #guile is absolutely phenomenal, people like ijp and mark_weaver are both true 31337s and always can be relied on to offer sage advice. You've brought up it's utility as a GNU extension language, and although I feel it's public documentation is not given a fair shake in the important arenas like GDB scripting, it is tremendously useful in this capacity. Of course, as an extension language itself, it excels. Excellent exposure and interaction with the bare-metal, good parallel & concurrent primitives (although they are more 'traditional', taking after the proud line of Pthreads than `link' or send/recieve in Erlang). It is quite large to statically link into your binary in comparison to other languages however, so be careful there. Weechat itself is written in C, but it does have Guile extensions (and unfortunately I may be the only person in the world to take advantage of this while writing an extension however https://github.com/zv/weechat-gateway-replacer https://github.com/zv/weechat-gateway-replacer ).