🚀 go-pugleaf

I'm trying to apply a function that I defined on all the files in the tags     
file list.  Can someone please help me?  Thanks!!  Here's my unsuccessful hack:

(defun test () "test"                         
        (insert-string "hi there"))           
                                              
(defun tags-do (this)                         
  "Run THIS on all files listed in tag table."
  (interactive "sDo what (function name): ")  
  (setq tags-loop-form (list this))           
  (tags-loop-continue t))                     
                                              
The error I get with (tags-do "test") is:     
                                              
Invalid function: "test"

Thanks for your help.  /jeff