Re: Issue 143 in yasnippet: Field variable nil, but field id still there in the buffer

Comment #2 on issue 143 by lennart.borgman: Field variable nil, but field  
id still there in the buffer
http://code.google.com/p/yasnippet/issues/detail?id=143

I think adding something like this should fix the problem (though I did not  
test it now):

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Change major mode hooks
;;

(put 'yas/fallback-behavior 'permanent-local t)
(put 'yas/dont-activate     'permanent-local t)
(put 'yas/mode-symbol       'permanent-local t)
(put 'yas/active-field-overlay      'permanent-local t)
(put 'yas/field-protection-overlays 'permanent-local t)
(put 'yas/deleted-text              'permanent-local t)

(defun yas/change-major-mode-handler ()
   "Handle exiting major modes."
   (when yas/active-field-overlay
     (delete-overlay yas/active-field-overlay)
     (setq yas/active-field-overlay))
   (when yas/field-protection-overlays
     (delete-overlay yas/field-protection-overlays)
     (setq yas/field-protection-overlays))))

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