Dmitry Savvinov
37 lines
766 B
Kotlin
Vendored
37 lines
766 B
Kotlin
Vendored
// !LANGUAGE: +AllowContractsForCustomFunctions +UseReturnsEffect
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// !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
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// !DIAGNOSTICS: -INVISIBLE_REFERENCE -INVISIBLE_MEMBER
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// !WITH_NEW_INFERENCE
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import kotlin.contracts.*
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fun Any?.isNull(): Boolean {
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contract {
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returns(false) implies (this@isNull != null)
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}
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return this == null
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}
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fun smartcastOnReceiver(x: Int?) {
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if (x.isNull()) {
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x<!UNSAFE_CALL!>.<!>inc()
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}
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else {
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<!DEBUG_INFO_SMARTCAST!>x<!>.dec()
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}
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}
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class UnstableReceiver {
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var x: Int? = 42
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fun smartcastOnUnstableReceiver() {
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if (x.isNull()) {
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x<!UNSAFE_CALL!>.<!>inc()
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}
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else {
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<!SMARTCAST_IMPOSSIBLE!>x<!>.dec()
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}
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}
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}
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