Fabien COELHO <coe...@cri.ensmp.fr> writes:
> For checking variable definition, I would suggest to extend the variable 
> access syntax so that there is no exception to the one thing rule between 
> client side and server side evaluation:

>    \if :?variable

Don't like that one bit; you're going to run out of namespace there
in no time.  And you don't have a very good way to say "if not defined",

                        regards, tom lane

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