Error with race and sync Observables

[nmote]

RxJS version:

5.0.0-beta.6

Code to reproduce:

At the Node (v5.0.0) console:

rx.Observable.race(rx.Observable.of(true), rx.Observable.of(false).delay(1500)).subscribe(console.log.bind(console))

Expected behavior:

true

Actual behavior:

true
TypeError: Cannot read property 'push' of null
    at RaceSubscriber._complete (/.../node_modules/@reactivex/rxjs/dist/cjs/operator/race.js:86:35)
    at RaceSubscriber.Subscriber.complete (/.../node_modules/@reactivex/rxjs/dist/cjs/Subscriber.js:113:18)
    at ArrayObservable._subscribe (/.../node_modules/@reactivex/rxjs/dist/cjs/observable/ArrayObservable.js:116:24)
    at ArrayObservable.Observable.subscribe (/.../node_modules/@reactivex/rxjs/dist/cjs/Observable.js:52:62)
    at Observable._subscribe (/.../node_modules/@reactivex/rxjs/dist/cjs/Observable.js:109:28)
    at RaceOperator.call (/.../node_modules/@reactivex/rxjs/dist/cjs/operator/race.js:55:23)
    at Observable.subscribe (/.../node_modules/@reactivex/rxjs/dist/cjs/Observable.js:52:38)
    at repl:1:81
    at REPLServer.defaultEval (repl.js:248:27)
    at bound (domain.js:280:14)

Additional information:

If I delay both, I don't get the TypeError. If I use toPromise and then .then it, rather than calling subscribe I don't get the TypeError.

It seems clear that it's a result of one of the Observables being synchronous. However if this is expected behavior I have two questions: (1) What should I do instead, if I receive Observables that may or may not be sync? (2) Why does the error appear to be an internal error, rather than a user-facing error?

cc @matthewwithanm

[kwonoj]

I don't think this is expected behavior, Observable should not throw in this case. Let me try look into to see what's happening.

[benlesh]

I was mildly excited when I thought @matthewwithanm was "Matthew with ham". Then I reread it. Can't win 'em all.

[lock]

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