I've been hopping between 3.7, and other later versions.

What is the best (most robust and reliable) way to determine if tau is defined,
and if not, set it's value?

I start off with #version version;

then:

#if (version < 3.8)
 #ifndef (tau)
    #declare tau = 2*pi;
    #end
#end


#if (version < 3.8)
 #ifndef (tau)
    #declare tau = 2*pi;
    #end
#end

I get:

Parse Warning: Tried to test whether a reserved keyword is defined. Test result
may not be what you expect.
Parse Error: Expected 'undeclared identifier', float function 'tau' found
instead

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