On Fri, Dec 16, 2016 at 10:28 AM, Pavel Stehule <pavel.steh...@gmail.com>

> 2016-12-16 18:21 GMT+01:00 David G. Johnston <david.g.johns...@gmail.com>:
>> On Fri, Dec 16, 2016 at 9:55 AM, Robert Haas <robertmh...@gmail.com>
>> wrote:
>>> If the expected committed patch set includes #5 then this becomes a
>> matter for reviewer convenience so never mind.  But if its at all possible
>> for #5 to be punted down the road incorporating the eventual "not var" and
>> "not(var)" syntax into #1 as a kind of shim would seem desirable.
> why do you need special operator for negation? there is only one use case.
> It can be solved by \if_not

​Not following the thread that closely and the section Robert quoted didn't
include "\if_not" as a syntax option.  I figured the idea was to limit the
number of backslash commands and leave the power in the expression

David J.

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