Eval Lexical em emacs24

Alguém pode me explicar comoeval funciona com emacs24? Deeval descrição:

eval is a built-in function in `C source code'.

(eval FORM &optional LEXICAL)

Evaluate FORM and return its value.
If LEXICAL is t, evaluate using lexical scoping.

Isso significa que algo assim deveria funcionar?

(setq lexical-binding t)
(let ((myvarr 42)) (eval 'myvarr t)) ; (void-variable myvarr)

Atualizar:

(setq lexical-binding nil)
;; => nil
(let ((myvarr 42)) (eval 'myvarr))
;; => 42 (#o52, #x2a, ?*)
(setq lexical-binding t)
;; => t
(let ((myvarr 42)) (eval 'myvarr))
;; Debugger entered--Lisp error: (void-variable myvarr)
;;   eval(myvarr)
;;   (let ((myvarr 42)) (eval (quote myvarr)))
;;   (progn (let ((myvarr 42)) (eval (quote myvarr))))
;;   eval((progn (let ((myvarr 42)) (eval (quote myvarr)))) t)
;;   eval-last-sexp-1((4))
;;   eval-last-sexp((4))
;;   call-interactively(eval-last-sexp nil nil)
;;   call-last-kbd-macro(nil kmacro-loop-setup-function)
;;   kmacro-call-macro(nil nil)
;;   kmacro-end-or-call-macro(nil)
;;   call-interactively(kmacro-end-or-call-macro nil nil)
(ignore-errors (let ((myvarr 42)) (eval 'myvarr)))
;; => nil
(setq lexical-binding nil)
;; => nil
(eval (let ((myvarr 42)) (eval 'myvarr)) t)
;; => 42
(eval '(let ((myvarr 42)) (eval 'myvarr)) t)
;; Debugger entered--Lisp error: (void-variable myvarr)
;;   eval(myvarr)
;;   (let ((myvarr 42)) (eval (quote myvarr)))
;;   eval((let ((myvarr 42)) (eval (quote myvarr))) t)
;;   eval((eval (quote (let ((myvarr 42)) (eval (quote myvarr)))) t) nil)
;;   eval-last-sexp-1((4))
;;   eval-last-sexp((4))
;;   call-interactively(eval-last-sexp nil nil)

Versão Emacs:GNU Emacs 24.1.1 (i386-mingw-nt6.1.7600) of 2012-06-10 on MARVIN

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