added test for KT-238

idea/testData/codegen/regressions/kt238.jet

@@ -0,0 +1,58 @@
+fun t1 () {
+    val a1 = Array<String?>(1)
+    a1[0] = "0" //ok
+    val s = a1[0] //ok
+}
+
+fun t2 () {
+    val a2 = Array<Int>(1)
+    a2[0] = 0 //ok
+    var i = a2[0] //ok
+}
+
+fun t3 () {
+    val a3 = Array<Int?>(1)
+    a3[0] = 0 //verify error
+    var j = a3[0] //ok
+    var k : Int = a3[0] ?: 5 //ok
+}
+
+fun t4 () {
+    val b1 = StrangeIntArray(10)
+    b1[4] = 5 //ok
+    var i = b1[1] //ok
+}
+
+fun t5 () {
+    val b2 = StrangeArray<Int>(10, 0)
+    b2.set(4, 5) //ok
+    b2[4] = 5 //verify error
+    var i = b2.get(2) //ok
+    i = b2[1] //verify error
+}
+
+fun t6() {
+    val b3 = StrangeArray<Int?>(10, 0)
+    b3.set(5, 6) //ok
+    b3[4] = 5 //verify error
+    val v = b3[1] //ok
+}
+
+fun box() : String {
+    return "OK"
+}
+
+class StrangeArray<T>(size: Int, private var defaultValue: T) {
+    fun get(index: Int): T = defaultValue
+    fun set(index: Int, v: T) {
+        defaultValue = v
+    }
+}
+
+class StrangeIntArray(size: Int) {
+    private var defaultValue = 0
+    fun get(index: Int): Int = defaultValue
+    fun set(index: Int, v: Int) {
+        defaultValue = v
+    }
+}