Method fail

src/python/py_callable.rs:55–63

(&self, message: String)

    }

    pub(crate) fn fail(&self, message: String) {
        let (mutex, condvar) = &*self.inner;
        let mut state = mutex.lock().unwrap();
        if state.is_terminal() {
            return;
        }
        *state = CallableState::Failed(message);
        condvar.notify_all();
    }

    pub(crate) fn cancel(&self) -> bool {
        let (mutex, condvar) = &*self.inner;