Function test_clock_register_default_handler 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn test_clock_register_default_handler(
    clock: &mut TestClock_API,
    callback_ptr: *mut PyObject,
)

Registers the default callback handler for TestClock.

Safety

Assumes callback_ptr is a valid PyCallable pointer.

Panics

Panics if the callback_ptr is null or represents the Python None object.