Avoid repeating the same `using` line for enclosed modules

[rdeits]

One option would be to use the @def macro that @ChrisRackauckas has mentioned here previously:

 macro def(name, definition)
    return quote
        macro $(esc(name))()
            esc($(Expr(:quote, definition)))
        end
    end
end

which you could use like this:

@def use_packages begin
    using Pkg1, Pkg2, Pkg3
end

module Module01
@use_packages
end