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declare function/macro private

From: Paul W. Rankin
Subject: declare function/macro private
Date: Sun, 6 Jun 2021 14:27:58 +1000

Given we have a function/macro declare interactive-only property, would it be 
worthwhile to consider a `private' property?

Of course there's already the convention of prefix--my-private-function, but my 
thinking here is that a program could declare a function/macro as private, then 
the compiler could signal a warning/error if that function appeared in a 
library outside the library it was defined and declared private.

e.g. in foo.el:

(defun foo-private ()
  (declare (private "use `foo-public' instead."))

(provide 'foo)

..in bar.el:

(defun bar-function ()

Compiling bar.el would signal a warning/error with hint to use `foo-public' 

Paul W. Rankin

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