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I just ran the following through Guile (the Gnu version of
Scheme) and got "baz".

  (let ((foo 'bar))
    (define func (lambda ()
    (set! foo 'baz) ;; Alters the foo within func.

The Lua equivalent (which also gives "baz") is

  local foo = "bar"

  function func()
    return foo
  end -- func

  foo = "baz" -- Alters the foo within func.


Guile is the only lexically scoped Lisp I have access to
from my current location, but my understanding is that any
modern lexically scoped Lisp would work the same way.