creloading a submodule doesn't work

[cstjean]

In this code, changes to SubMod.x are ignored.

module TestMod
module SubMod
export x
x = 8
end
using .SubMod
end

It's the using that's problematic. SubMod.x works fine. The proper solution on our side would be to eval the submodule code inside the submodule. That's not a trivial amount of work.