Re: Is there a way of setting a variable only when it exists?

[Emanuel Berg]

Tomas Nordin wrote:

> What about doing an assert of sorts
>
> (message "some--internal-var is %S" some--internal-var)
> (setq some--internal-var 42)
>
> It will crash your init process if some--internal-var is void.

Byte-compile

  (message "some--internal-var is %S" some--internal-var)

and the byte-compiler will tell you

  Warning: reference to free variable ‘some--internal-var’

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