Added support for returning value from safe qualified expression.

translator/src/org/jetbrains/k2js/translate/ExpressionVisitor.java

@@ -379,10 +379,11 @@ public final class ExpressionVisitor extends TranslatorVisitor<JsNode> {
     public JsNode visitSafeQualifiedExpression(@NotNull JetSafeQualifiedExpression expression,
                                                @NotNull TranslationContext context) {
         JsExpression receiver = translateReceiver(expression, context);
+        JsNullLiteral nullLiteral = context.program().getNullLiteral();
         JsBinaryOperation nullCheck = new JsBinaryOperation
-                (JsBinaryOperator.NEQ, receiver, context.program().getNullLiteral());
+                (JsBinaryOperator.NEQ, receiver, nullLiteral);
-        JsStatement thenStatement = AstUtil.convertToStatement(translateQualifiedExpression(expression, context));
+        JsExpression thenExpression = AstUtil.convertToExpression(translateQualifiedExpression(expression, context));
-        return new JsIf(nullCheck, thenStatement, null);
+        return new JsConditional(nullCheck, thenExpression, nullLiteral);
     }
 
 

translator/test/org/jetbrains/k2js/test/PropertyAccessorTest.java

@@ -44,6 +44,11 @@ public final class PropertyAccessorTest extends AbstractClassTest {
         testFooBoxIsTrue("safeCall.kt");
     }
 
+    @Test
+    public void safeCallReturnsNullIfFails() throws Exception {
+        testFooBoxIsTrue("safeCallReturnsNullIfFails.kt");
+    }
+
     //TODO test
 //    @Test
 //    public void namespaceCustomAccessors() throws Exception {

translator/testFiles/propertyAccess/cases/safeCallReturnsNullIfFails.kt

@@ -0,0 +1,10 @@
+namespace foo
+
+class A() {
+  val x = 4
+}
+
+fun box() : Boolean {
+    var a : A? = null;
+    return (a?.x == null);
+}