KT-4107 Data objects

compiler/testData/diagnostics/tests/dataObjects/overrideEqualsAndHashCode.kt

@@ -0,0 +1,44 @@
+// FIR_IDENTICAL
+// LANGUAGE: +DataObjects
+
+data object Override {
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun equals(other: Any?): Boolean {
+        return true
+    }
+
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun hashCode(): Int {
+        return 1
+    }
+}
+
+open class Base {
+    open fun hashCode(x: Int) = x
+}
+
+data object NoOverride: Base() {
+    fun equals(other: Any?, tag: Int): Boolean {
+        return true
+    }
+
+    fun hashCode(param: String): Int {
+        return 1
+    }
+
+    override fun hashCode(x: Int) = x + 1
+}
+
+open class Super {
+    override fun equals(other: Any?): Boolean {
+        return super.equals(other)
+    }
+
+    override fun hashCode(): Int {
+        return 1
+    }
+}
+
+data object OverridenInSuper: Super() {
+    <!DATA_OBJECT_CUSTOM_EQUALS_OR_HASH_CODE!>override<!> fun equals(other: Any?): Boolean {
+        return super.equals(other)
+    }
+}