Merge "diagnostic with Java 8" tests with general diagnostic tests

compiler/testData/diagnostics/tests/targetedBuiltIns/backwardCompatibility/delegation.kt

@@ -0,0 +1,32 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -PLATFORM_CLASS_MAPPED_TO_KOTLIN
+
+
+// Default methods from Java interfaces are NOT overridden by delegation.
+// So, in the example below 'TestNoDelegationToDefaultMethods#replace' implicitly overrides a method from 'java.util.Map' (which is ok),
+// but not a method from 'WithDelegation' (would be an error).
+open class WithDelegation(val m: Map<String, String>) : Map<String, String> by m
+
+class TestNoDelegationToDefaultMethods(m: Map<String, String>): WithDelegation(m) {
+    fun <!VIRTUAL_MEMBER_HIDDEN!>containsKey<!>(key: String): Boolean = TODO()
+
+    fun getOrDefault(key: String, defaultValue: String): String = TODO()
+
+    fun replace(key: String, value: String): String? = TODO()
+}
+
+
+
+interface IBaseWithKotlinDeclaration : Map<String, String> {
+    fun replace(key: String, value: String): String?
+}
+
+abstract class WithDelegation2(val m: Map<String, String>) : Map<String, String> by m, IBaseWithKotlinDeclaration
+
+abstract class TestNoDelegationToDefaultMethods2(m: Map<String, String>): WithDelegation2(m) {
+    fun <!VIRTUAL_MEMBER_HIDDEN!>containsKey<!>(key: String): Boolean = TODO()
+
+    fun getOrDefault(key: String, defaultValue: String): String = TODO()
+
+    // VIRTUAL_MEMBER_HIDDEN: hides member declaration inherited from a Kotlin interface
+    fun <!VIRTUAL_MEMBER_HIDDEN!>replace<!>(key: String, value: String): String? = TODO()
+}