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something like perl's 'require 5.4'

Hi all. 

  I'm looking for something that check the version of the current IDL
  session against an input version, like perl's 'require 5.4'
  semantics and I *thought* I saw someone mention using something very
  much like this. 

  Does anyone know of such a thing or was I just hallucinating?

William Daffer: 818-354-0161: William.Daffer@jpl.nasa.gov