emacs not accepting lambda in after-change-functions -

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i'm attempting overload after-change-functions in given buffer through class method. notify-others-of-change arbitrary function.

(defmethod set-after-change-functions ((server server-class)                                               name-of-buffer)   "adds appropriate after-change-functions given name-of-buffer."   (with-current-buffer name-of-buffer     (setq-local after-change-functions                 (cons                     (lambda (beg end prev-length)                         (notify-others-of-change                            server beg end prev-length))                    after-change-functions))))

when attempting run on given buffer (passing in valid server object, checked), emacs yells @ me "symbol's value variable void: server" , after-change-functions goes nil, if there elements in before. however, when changed to

(defmethod set-after-change-functions ((server server-class)                                               name-of-buffer)   "adds appropriate after-change-functions given name-of-buffer."   (with-current-buffer name-of-buffer     (setq-local after-change-functions                 (cons                    #'notify-others-of-change-simple                    after-change-functions))))

where notify-others-of-change-simple basic after-change function accepts 3 arguments in lambda above, seems work. i'd prefer use lambda here, appears it's not possible. why problem occurring , possible change allow lambdas used?

setting lexical-binding t file-local variable described in question linked legoscia, along making sure sharp-quote lambdas instead of quoting, managed fix problem. thanks!


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