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kotlinlang

<@U1G3FFR1V> It _is_ used in production already. Kotlin compiler itself is already using coroutines. Even when we drop `experimental` we will still support older code that was written against `experimental` packages. Moreover, Kotlin guarantees full backwards-compatibility even for experimental features like coroutines. Your coroutine code will not break in 1.1.x updates. See here for details: <https://kotlinlang.org/docs/reference/compatibility.html>