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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Setting risky-local-variable
Date: Fri, 27 May 2005 10:20:30 -0400
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    What is the recommended way to set 'risky-local-variable for a Lisp
    variable defined in C code?

      extern Qrisky_local_variable;
      Fput(Vmy_var, Qrisky_local_variable, Qt);

    or an autoload

      ;;;###autoload (put 'my_var 'risky-local-variable t)

I think the former is cleaner, but the latter is also ok
if it is more convenient.

Also put a comment about this near where the C code defines the
variable.