[Bug] Jac check doesn't detect that a function is not defined

[mgtm98]

when doing jac check on and there is a function called but never defined, jac doesn't get the issue

To Reproduce

with entry {
    a = 4;
    b = 7;
    c = a + b;
    d = a + b + c;

    h = float(a);
    l = floor(h);

    print(path);
}

jac check t.jac