ExperimentalExtendedContracts

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

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

Since Kotlin

2.2