KT-1519: Error calling native extension function from user defined extension function.

js/js.translator/testFiles/native/cases/KT-1519.kt

@@ -0,0 +1,19 @@
+package foo
+
+native
+class Wow() {
+    val x : Int = js.noImpl
+    val y : Int = js.noImpl
+}
+
+native
+fun Wow.sum() : Int = js.noImpl
+
+fun Wow.dblSum() : Int {
+    return 2 * sum()
+}
+
+
+fun box() : Boolean {
+    return (Wow().dblSum() == 6)
+}

js/js.translator/testFiles/native/native/KT-1519.js

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+function Wow() {
+    this.x = 1;
+    this.y = 2;
+}
+
+Wow.prototype.sum = function() {
+    return this.x + this.y;
+};