Test for KT-2388: if function passed as setTimeout callback, all "this" references will be point to HTML window instead of real object.

#KT-2388 fixed

js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java

@@ -75,4 +75,8 @@ public final class NativeInteropTest extends SingleFileTranslationTest {
     public void testKt2209() throws Exception {
         fooBoxTest();
     }
+
+    public void testKt2388() throws Exception {
+        fooBoxTest();
+    }
 }

js/js.translator/testFiles/native/cases/Kt2388.kt

@@ -0,0 +1,20 @@
+package foo
+
+native
+fun _setTimeout(callback:()->Unit):Unit = noImpl
+
+var done = false
+
+object foo {
+    var timeoutId: Long = 1
+
+    val callbackWrapper = {
+        timeoutId = -1 as Long
+        done = true
+    }
+}
+
+fun box(): Boolean {
+    _setTimeout(foo.callbackWrapper)
+    return foo.timeoutId == -1 as Long
+}

js/js.translator/testFiles/native/native/Kt2388.js

@@ -0,0 +1,3 @@
+function _setTimeout(callback) {
+    callback.call({});
+}