Kotlin
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kotlin.Nothing

Nothing

kotlin-stdlib / kotlin - Nothing 
class Nothing

Nothing has no instances. You can use Nothing to represent "a value that never exists": for example, if a function has the return type of Nothing, it means that it never returns (always throws an exception).

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-nothing.html