Mads Ager
26 lines
406 B
Kotlin
Vendored
26 lines
406 B
Kotlin
Vendored
// !OPT_IN: kotlin.contracts.ExperimentalContracts
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// WITH_STDLIB
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import kotlin.contracts.*
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fun runOnce(action: () -> Unit) {
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contract {
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callsInPlace(action, InvocationKind.EXACTLY_ONCE)
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}
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action()
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}
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fun ok(): String {
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val res: String
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when (val o = "OK") {
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else -> runOnce {
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res = o
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}
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}
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return res
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}
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fun box(): String {
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return ok()
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}
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