I have a function main() in which I encapsulate my code, notably to use the
@time macro, inside this main() I include files that load data from files
to simulate some models that use a specific syntax (a variable p is defined
for parameters of the model, etc.) and there are some models for which
there is a variable named mn, and some others for which this quantity does
not make sense. When this quantity is not defined in the files I load, I'd
like to set it to a specific value, such as Void. But the fact that I'm
inside main() causes this problem.
