[thegeomaster]

Thanks for the insight, much appreciated.

Out of curiosity, what do you mean by 'verbosity' in this case? I just Googled and it looks like Elisp uses the same (lambda (arg) form) syntax, like CL---is this what you're referring to?

[xrange]

Lexical binding is a "new" feature for elisp. See:

http://www.emacswiki.org/emacs/LexicalBinding

...for some of the issues.