Julia - Metaprogramming for using several modules

Question

I'm using Julia to autograde students' work. I have all of their files Student1.jl, Student2.jl, etc. as separate modules Student1, Student2, etc in a directory that is part of LOAD_PATH. What I want to be able to do works completely fine in the REPL, but fails in a file.

macro Student(number)
    return Meta.parse("Main.Student$number")
end

using Student1
@Student(1).call_function(inputs)

works completely fine in the REPL. However, since I'm running this in a script, I need to be able to include the modules with more metaprogramming that is currently not working. I would have thought that the exact same script above would have worked in a file Autograder.jl by calling

@eval(using Student1)
@Student(1).call_function(inputs)

in a module Autograder. But I get either an UndefVarError: Student1 not defined or LoadError: cannot replace module Student1 during compilation depending on how I tweak things.

Is there something small in Julia metaprogramming I'm missing here to make this autograding system work out? Thanks for any advice.