Re: emacs-27 breaks null function

[Nelson H. F. Beebe]

Andreas Schwab <address@hidden> writes in response:

>> That variable (executing-macro) as been marked obsolete for more than 24 
>> years.
>> The alias has finally been removed in emacs 27.  Use executing-kbd-macro
>> instead.

Thanks, that solves the problem for the particular use of executing-macro,
but what about testing for an undefined variable in general, such as

        (null this-var-might-not-be-defined-but-might-also-be-defined)
?

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