Fix issue 6403: do not crash if super indexed load does not exist (return 'no-such-method call' ins…

tests/language/super_operator_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Dart test for testing super operator calls
 
 
 class A {
   String val = "";
   List things;
 
@@ skipping 29 matching lines @@
   }
 
   operator []= (i, val) {
     // Make sure the index expression is only evaluated
     // once in the presence of a compound assignment.
     return super[i++] += val;
   }
 
 }
 
+
+class Autobianchi {
+  g() => super[0];
+}
+
+
+testRegression6403() {
+  // Do not crash, throw exception instead
+  new Autobianchi().g();
+}
+
+
 main () {
   var a = new A();
   a = a + "William";  // operator + of class A.
   Expect.equals("William", a.val);
   Expect.equals("r", a[2]);  // operator [] of class A.
 
   a = new B();
   a += "Tell";   // operator + of class B.
   Expect.equals("TellTell", a.val);
   Expect.equals("rr", a[2]);  // operator [] of class B.
 
   a[4] = 1;  // operator []= of class B.
   Expect.equals(43, a.things[4]);
   Expect.equals(86, a[4]);
 
+  Expect.throws(testRegression6403);
 }