T> method Null safety
Returns a non-terminating stream sequence, which can be used to denote an infinite duration.
The never operator is one with very specific and limited behavior. These are useful for testing purposes, and sometimes also for combining with other Streams or as parameters to operators that expect other Streams as parameters.
Rx.never().listen(print); // Neither prints nor terminates
static Stream<T> never<T>() => NeverStream<T>();