Agreement tests with globals:

    check_both("var x: i64 = 42; fn get() i64 { return x; } get()", 42);
    check_both("var x: i64 = 0; fn inc() i64 { x = x + 1; return x; } inc(); inc(); inc()", 3);
    check_both(
        \\var counter: i64 = 0;
        \\fn bump() i64 {
        \\    counter = counter + 1;
        \\    return counter;
        \\}
        \\bump();
        \\bump();
        \\bump();
        \\counter
    , 3);

Three tests. Two engines. Same answers. Globals work in the interpreter, the compiler, and the VM.