Is "include" safe to use inside a function?

General Usage
20

This code modifies the global value m and r for example. My first intuition is to simply redefine a constructor function via include:

function make_instance()
  m = 3
  r = exp(m/600)
  return(data_type_A([...]))
end

Then you simply include the file to redefine the constructor, and call make_instance()

include("thefile.jl")

inst = make_instance()