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kotlinlang

<@U0B86L2VA> Here it is. It is for old revision of coroutines. Needs cleanup and updating. I hope you can get the idea, though: 
1. Iterator over observable: <https://github.com/elizarov/kotlinx.coroutines/blob/asyncRxIterator/kotlinx-coroutines-rx/src/main/kotlin/asyncRxIterator.kt>
2. Generator for observable with backpressure support (named `asyncRxGenerate{ ... emit(x) ... }` -- not a good choice) <https://github.com/elizarov/kotlinx.coroutines/blob/asyncRxGenerate/kotlinx-coroutines-rx/src/main/kotlin/asyncRxGenerator.kt>