reactive/kotlinx-coroutines-rx2/src/RxAwait.kt [250:270]:
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        override fun onNext(t: T & Any) {
            when (mode) {
                Mode.FIRST, Mode.FIRST_OR_DEFAULT -> {
                    if (!seenValue) {
                        seenValue = true
                        cont.resume(t)
                        subscription.dispose()
                    }
                }
                Mode.LAST, Mode.SINGLE -> {
                    if (mode == Mode.SINGLE && seenValue) {
                        if (cont.isActive)
                            cont.resumeWithException(IllegalArgumentException("More than one onNext value for $mode"))
                        subscription.dispose()
                    } else {
                        value = t
                        seenValue = true
                    }
                }
            }
        }
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reactive/kotlinx-coroutines-rx3/src/RxAwait.kt [230:250]:
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        override fun onNext(t: T & Any) {
            when (mode) {
                Mode.FIRST, Mode.FIRST_OR_DEFAULT -> {
                    if (!seenValue) {
                        seenValue = true
                        cont.resume(t)
                        subscription.dispose()
                    }
                }
                Mode.LAST, Mode.SINGLE -> {
                    if (mode == Mode.SINGLE && seenValue) {
                        if (cont.isActive)
                            cont.resumeWithException(IllegalArgumentException("More than one onNext value for $mode"))
                        subscription.dispose()
                    } else {
                        value = t
                        seenValue = true
                    }
                }
            }
        }
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