Deprecations: data class should now have at least one primary constructor parameter, parameters should be val / var and not vararg.

compiler/testData/diagnostics/tests/secondaryConstructors/dataClasses.kt

@@ -3,10 +3,10 @@ data class A1(val x: String) {
     constructor(): this("")
 }
 
-data class A2() {
-    constructor(x: String): this()
+data class A2(val y: String, val z: Int) {
+    constructor(x: String): this(x, 0)
 }
 
-data class <!PRIMARY_CONSTRUCTOR_REQUIRED_FOR_DATA_CLASS!>A3<!> {
+data class <!PRIMARY_CONSTRUCTOR_REQUIRED_FOR_DATA_CLASS, DATA_CLASS_WITHOUT_PARAMETERS!>A3<!> {
     constructor()
 }