Re: [External] : Re: Lexical vs. dynamic: small examples?

[Emanuel Berg]

Stefan Monnier via Users list for the GNU Emacs text editor wrote:

> One example is the variable `pi` which holds the famous
> constant but we don't want (let ((pi (get-previous-interval
> x))) ...) to temporarily redefine `pi` to
> something unrelated.

(defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).")
(with-suppressed-warnings ((lexical pi))
  (defconst pi float-pi
    "Obsolete since Emacs-23.3.  Use `float-pi' instead."))
(make-obsolete-variable 'pi 'float-pi "23.3")
(internal-make-var-non-special 'pi)

OT, can't (make-obsolete-variable 'pi 'float-pi "23.3") make
that docstring ... obsolete?

Or perhaps one still wants it so it'll be human-language
readable in the code, not just the help/byte-compiler?

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