How do I add a function/method to an already defined module

General Usage
7

I would like to thank mauro3, tkoolen for helping me solve my issue. Here is the simplified version on Repl.it.

I also experience some weird issues with importing. For example, I have two include files:

include("splash_scene.jl")
include("game_scene.jl")

both perform the same import statements:

import .Ranger.Nodes:
    transition, get_replacement, visit

If I forget to import visit in either one of the files I get this warning:

WARNING: import of Nodes.visit into Main conflicts with an existing identifier; ignored.

And as a result, the abstract overload is called instead. This is unexpected and in addition I don’t know why Julia issues this. It is true that I should only have only one import for both files—which is what I did to make sure there isn’t an inconsistency—but still it would be nice if Julia could somehow give a better clue to the problem. It took me 20 minutes to realize what the bug was. Basically, if you have this:

import .Ranger.Nodes:
    transition, get_replacement, visit

... more code and some includes()

import .Ranger.Nodes:
    transition, get_replacement       #<--- missing visit import

You will get a warning.

Anyway, I am still learning Julia and I enjoy the language even with a few errors on my part.
The code-in-progress in on Github if you are interested.

Below is a stripped down example with two lines marked important:

module Ranger
  module Nodes
    # This is important piece #1
    function transition end

    # Simple demo node for example ----------
    abstract type AbstractNode end

    mutable struct Node <: AbstractNode
      x::Float64
    end

    crossnode = Node(1.0)
    # -------------------------------------

    function visit()
      transition(crossnode)
    end
  end
end

# Demo engine
module Engine
  using ..Ranger.Nodes:
    visit
    
  function run()
    visit()
  end
end

# ------------------
using .Ranger.Nodes:
  AbstractNode, Node

# This is the important piece #2
import .Ranger.Nodes:
  transition

function transition(node::AbstractNode)
  println("abstract node transition")
end

function transition(node::Node)
  println("node transition")
end

# -------------------------
using .Engine:
  run
  
function go()
  run()
end
  
go()