Exceed evaluation depth when forward function in Emacs Lisp -

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here simplified code snipped have not managed work. not understand wrong.

(defun enumerate-indicies (func)     (let ((index 0))         (while (< index 5)             (funcall func index)             (setq index (1+ index)))))  (defun enumerate-multiplied-indicies (func)     (enumerate-indicies #'(lambda (index)                             (funcall func (* 10 index)))))

the following testing code returns 10 expected:

(defun test/enumerate-indicies ()     (let ((sum 0))           (enumerate-indicies #'(lambda (index)                                     (setq sum (+ sum index))))     sum))  (test/enumerate-indicies)

but below causes error lisp nesting exceeds max-lisp-eval-depth in emacs:

(defun test/enumerate-multiplied-indicies ()     (let ((sum 0))           (enumerate-multiplied-indicies #'(lambda (index)                                              (setq sum (+ sum index))))     sum)) (test/enumerate-multiplied-indicies)

could please give clue? not supposed recursive call here seems is. thanks.

how using lexical-let penetrate lambda? correct answer 100?

(defun enumerate-indicies (func)   (let ((index 0))     (while (< index 5)       (funcall func index)         (setq index (1+ index)))))  (defun enumerate-multiplied-indicies (func)   (lexical-let ((func func))     (enumerate-indicies #'(lambda (index)       (funcall func (* 10 index))))))  (defun test/enumerate-multiplied-indicies ()   (lexical-let ((sum 0))     (enumerate-multiplied-indicies #'(lambda (index)       (setq sum (+ sum index))))     sum))  (test/enumerate-multiplied-indicies)

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