Re: e and pi

[Eli Zaretskii]

> From: Helmut Eller <address@hidden>
> Date: Fri, 17 Sep 2010 18:18:25 +0200
> 
> >   (defun froob (argv)
> >      (lambda (f) (cons f argv)))
> >
> > and have that fail, because "argv" is a defvar defined in startup.el.
> 
> I once had a function with an argument called system-name.  Suddenly
> Emacs started to complain that some files are locked by some other user.
> How many people now that system-name is a global variable and used by
> the file-locking code?  The lesson is that Emacs should not pre-define
> global variables with names that are likely candidates for local
> variables.

What you describe as a big surprise is actually known to every C/C++
programmer: some names are "reserved by the implementation" and should
not be used by the application code.