Dmitry Jemerov
23 lines
473 B
Kotlin
23 lines
473 B
Kotlin
import java.util.ArrayList
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import java.util.Arrays
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interface A {
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fun foo(): Collection<String>
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}
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interface B : A {
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override fun foo(): MutableCollection<String>
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}
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class C : B {
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override fun foo(): MutableList<String> = ArrayList(Arrays.asList("C"))
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}
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fun box(): String {
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val c = C()
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var r = c.foo().iterator().next()
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r += (c : B).foo().iterator().next()
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r += (c : A).foo().iterator().next()
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return if (r == "CCC") "OK" else "Fail: $r"
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}
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