Error in example code for "global binding during remote execution" in Julia doc

New to Julia
1

In section title What are the possible causes of an UndefVarError during remote execution? in page 427 Julia 1.3.0 doc pdf, there is the following code example:

@everywhere module Foo
    function foo()      
        global gvar = "Hello"  
        remotecall_fetch(() -> gvar, 2)
    end
end

To fix the intentional bug and make the code work, I had to introduces two fixes:

@everywhere module Foo
    using Distributed
    gvar = "Hello"
    function foo()        
        remotecall_fetch(() -> gvar, 2)
    end
end
  1. using Distributed added to the module Foo
  2. gvar is put in module global from the beginning

Here I wonder why using Distributed had to be added to the module Foo because I already ran using Distributed outside of module Foo before I do @everywhere module Foo, thereby having made the remote processes ready for using Distributed far before Foo was defined.