Single module vs. submodules in a project

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You are not using submodules here, you are just creating two individual “packages”, though because you are pushing to LOAD_PATH these things are less clear.

A submodule must be defined within the scope of a parent module, like in the example here copied below, or by including the file containing the submodule within the parent module. The module blocks must be nested.

module Parent

module Utils
...
end

using .Utils

...
end

If you want to do that precompilation test properly with submodules, you would need the following:

module MyModule # MyModule.jl 

include("MySubModule.jl")
using .MySubModule # note the dot

export f

f(a) = 2*g(a)

end

As a side note, pushing to the LOAD_PATH is not the best way of organizing code, since you won’t be making use of dependency resolution and reproducible environments you can do with a Project.toml file and using Pkg.

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