KT-4107 Data objects

compiler/testData/diagnostics/testsWithJvmBackend/dataObjects/customReadResolve.kt

@@ -0,0 +1,16 @@
+// !LANGUAGE: +DataObjects
+// TARGET_BACKEND: JVM_IR
+
+import java.io.Serializable
+
+data <!CONFLICTING_JVM_DECLARATIONS!>object A<!> : Serializable {
+    <!CONFLICTING_JVM_DECLARATIONS!>private fun readResolve(): Any<!> = this
+}
+
+data object B : Serializable {
+    private fun readResolve(): B = this
+}
+
+data object C {
+    private fun readResolve(): Any = this
+}

compiler/testData/diagnostics/testsWithJvmBackend/dataObjects/customReadResolve.txt

@@ -0,0 +1,26 @@
+package
+
+public data object A : java.io.Serializable {
+    private constructor A()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    private final fun readResolve(): kotlin.Any
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object B : java.io.Serializable {
+    private constructor B()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    private final fun readResolve(): B
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+
+public data object C {
+    private constructor C()
+    public open override /*1*/ /*synthesized*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*synthesized*/ fun hashCode(): kotlin.Int
+    private final fun readResolve(): kotlin.Any
+    public open override /*1*/ /*synthesized*/ fun toString(): kotlin.String
+}
+