KT-1733 test for obsolete issue

compiler/testData/codegen/regressions/kt1733.kt

@@ -0,0 +1,12 @@
+fun box(args) : String {
+        val map = java.util.TreeMap<String, String>()
+        map["a"] = "1"
+        map["b"] = "2"
+
+        var list = arrayList<String>()
+        for (e in map) {
+            list += e.getKey()
+        }
+
+        return if(list.size==2) "OK" else "fail"
+}

compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java

@@ -344,4 +344,8 @@ public class StdlibTest extends CodegenTestCase {
     public void testUptoDownto() {
         blackBoxFile("uptoDownto.kt");
     }
+
+    public void test1733() {
+        blackBoxFile("regressions/kt1733.kt");
+    }
 }