Function lsode::fake_jacobian

pub extern "C" fn fake_jacobian(
    _x1: &mut c_int, 
    _x2: &mut c_double, 
    _x3: &mut c_double, 
    _x4: &mut c_int, 
    _x5: &mut c_int, 
    _x6: &mut c_double, 
    _x7: &mut c_int
)