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assert

inline fun assert(value: Boolean)

Platform and version requirements: JVM

Throws an AssertionError if the value is false and runtime assertions have been enabled on the JVM using the -ea JVM option.

inline fun assert(value: Boolean, lazyMessage: () -> Any)

Platform and version requirements: JVM

Throws an AssertionError calculated by lazyMessage if the value is false and runtime assertions have been enabled on the JVM using the -ea JVM option.

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/assert.html