static assert(version(x)) ?

[Robert M. Münch]

How can I write something like this to check if any of a set of 
specific versions is used?

static assert(!(version(a) | version(b) | version(c)):

The problem is that I can use version(a) like a test, and the symbol a 
is not accessbile from assert (different, non-accessible namespace).

-- 
Robert M. Münch
http://www.saphirion.com
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