I stand corrected, nested functions are existent within several languages, both compiled and interpreted ones (I would however like to point out that classes is a whole other story).
Still, the fact remains that adding such structural changes to the mIRC scripting language is very likely to decrease performance severely. However, if you really think that the parsing engine in mIRC is built in such a way that this would not make any notable* difference in execution speed, you are naive. And I might as well be paranoid. Let the benchmarks decide
The reason I'm so engaged in this issue is that I am currently working on a very large and cpu-demanding script that has caused me alot of headaches performance-wise. I would hate to see mIRC become even slower.
* By notable I mean seeing a distinct difference in performance when benchmarked
