You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: module.rs
    path of file: ./repos/ruruby/ruruby/src/builtin
    
    the code of the file until where you have to start completion: use crate::*;

pub(crate) fn init(globals: &mut Globals) {
    let class = BuiltinClass::module();
    globals.set_toplevel_constant("Module", class);
    class.add
    
    fn module_methods() {
        let program = r#"
    class A
        Foo = 100
        Bar = 200
        def fn
            puts "fn"
        end
        def fo
            puts "fo"
        end
    end
    def ary_cmp(a,b)
        puts a,b
        return false if a - b != []
        return false if b - a != []
        true
    end
    assert(true, ary_cmp(A.constants, [:Bar, :Foo]))
    assert(true, ary_cmp(A.instance_methods - Class.instance_methods, [:fn, :fo]))
    assert(true, ary_cmp(A.instance_methods(false), [:fn, :fo]))
    "#;
        assert_script(program);
    }