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Common
JVM
JS
Native
1.0
ExperimentalContracts()

This marker distinguishes the experimental contract declaration API and is used to opt-in for that feature when declaring contracts of user functions.

Any usage of a declaration annotated with @ExperimentalContracts must be accepted either by annotating that usage with the OptIn annotation, e.g. @OptIn(ExperimentalContracts::class), or by using the compiler argument -opt-in=kotlin.contracts.ExperimentalContracts.