toString() method for data classes and fake implementation for hashCode/equals

compiler/testData/codegen/dataClasses/tostring/arrayParams.kt

@@ -0,0 +1,14 @@
+data class A(val x: Array<Int>?, val y: IntArray?)
+
+fun box(): String {
+    var ts = A(Array<Int>(2, {it}), IntArray(3)).toString()
+    if(ts != "A{x=[0, 1], y=[0, 0, 0]}") return ts
+
+    ts = A(null, IntArray(3)).toString()
+    if(ts != "A{x=null, y=[0, 0, 0]}") return ts
+
+    ts = A(null, null).toString()
+    if(ts != "A{x=null, y=null}") return ts
+
+    return "OK"
+}

compiler/testData/codegen/dataClasses/tostring/changingVarParam.kt

@@ -0,0 +1,11 @@
+data class A(var string: String)
+
+fun box(): String {
+    val a = A("Fail")
+    if(a.toString() != "A{string=Fail}") return "fail"
+
+    a.string = "OK"
+    if("$a" != "A{string=OK}") return a.toString()
+
+    return "OK"
+}

compiler/testData/codegen/dataClasses/tostring/genericParam.kt

@@ -0,0 +1,11 @@
+data class A<T>(val x: T)
+
+fun box(): String {
+    val a = A(42)
+    if ("$a" != "A{x=42}") return "$a"
+    
+    val b = A(239.toLong())
+    if ("$b" != "A{x=239}") return "$b"
+    
+    return "OK"
+}

compiler/testData/codegen/dataClasses/tostring/mixedParams.kt

@@ -0,0 +1,7 @@
+data class A(var x: Int, y: Int, val z: Int?)
+
+fun box(): String {
+    val a = A(1, 2, null)
+    if("$a" != "A{x=1, z=null}") return "$a"
+    return "OK"
+}

compiler/testData/codegen/dataClasses/tostring/overriddenProperty.kt

@@ -0,0 +1,11 @@
+open data class A(open val x: String)
+
+class B : A("OK") {
+    override val x: String = "Fail"
+}
+
+fun foo(a: A) = a
+
+fun box(): String {
+    return if ("${foo(B())}" == "A{x=OK}") "OK" else "fail"
+}

compiler/testData/codegen/dataClasses/tostring/unitComponent.kt

@@ -0,0 +1,6 @@
+data class A(val x: Unit)
+
+fun box(): String {
+    val a = A(#())
+    return if ("$a" == "A{x=()}") "OK" else "$a"
+}