Hi I am wondering what to do when two structs are dependent on each other. For example

module PolulationGenerator
  mutable struct Person
    id::Integer
    age::Integer
    current_location::Union{Place, nothing}
  end

  mutable Struct Place
    person::Person
    is_family::Bool
  end
end

Here both the struts depend on each other as Person has field “current_location” of type Place. While struct Place takes in field “person” of type Person. I am unable to place one struct over the other as they are both have fields of Type of each other. What should I do with a problem like this. I get the error UndefVarError" Place not defined