Suppose that I define a variable so that according to a tag I can generate

a a a


a b a

Is there any way to make lilypond complaint with a compilation
error/warning in case I don't  specify a \keepWithTag or \removeWithTag?

For example:

\version "2.19.81"
var = {
  \tag#'vera a
  \tag#'verb b
{\var}  #this should generate a warning
{\keepWithTag #'vera \var} #this is ok!
{\keepWithTag #'verb \var} #this is ok!
{\removeWithTag #'vera \var} #this is ok!

Thank you, g.
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