"Fexprs more flexible, powerful, easier to learn? (Newlisp vs CL)" @ c.l.l.
Rainer Joswig (with some participation from Kaz Kylheku and Pascal Bourguignon) on a practical example explain, what problems of dynamic scope (still used in the suggested "improved" newLisp, which turns out to be old, actually :) are solved by lexical scope.
Bonus: how to create lisp-style special global variables in C++ (and a discussion of what can be improved in CL in this regard)
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