KT-274 stdlib part and commented test. Still require frontend test

compiler/testData/codegen/regressions/kt274.kt

@@ -0,0 +1,14 @@
+import std.*
+
+fun box() : String {
+    val vector = java.util.Vector<Int>()
+    vector.add(1)
+    vector.add(2)
+    vector.add(3)
+
+    var sum = 0
+    for(e in vector.elements()) {
+        sum += e
+    }
+    return if(sum == 6) "OK" else "fail"
+}

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

@@ -80,4 +80,8 @@ public class StdlibTest extends CodegenTestCase {
     public void testKt864 () {
         blackBoxFile("regressions/kt864.jet");
     }
+
+    public void testKt274 () {
+//        blackBoxFile("regressions/kt274.kt");
+    }
 }

stdlib/ktSrc/Standard.kt

@@ -7,6 +7,26 @@ import java.util.HashSet
 import java.util.LinkedHashSet
 import java.util.TreeSet
 
+/*
+Helper to make jet.Iterator usable in for
+*/
+inline fun <T> jet.Iterator<T>.iterator() = this
+
+/*
+Helper to make java.util.Iterator usable in for
+*/
+inline fun <T> java.util.Iterator<T>.iterator() = this
+
+/*
+Helper to make java.util.Enumeration usable in for
+*/
+inline fun <T> java.util.Enumeration<T>.iterator() = object: Iterator<T> {
+  override val hasNext: Boolean
+    get() = hasMoreElements()
+
+  override fun next() = nextElement()
+}
+
 /*
  * Extension functions on the standard Kotlin types to behave like the java.lang.* and java.util.* collections
  */