Workout what modules have been loaded by parent file

[oxinabox]

For example:

File Main.jl

module Main
using Foobar

include("sub.jl")

Then when you are editting sub.jl
it should know to complete all the things exported by Foobar.

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This is a little tricky as it means you need to search the area around a file, to try and work out where it is used.
And it goes kinda nuts if your file is included in multiple places.
But most files are not.