Make sure to register +/- when we're using ++/--.

lib/compiler/implementation/resolver.dart

 // Copyright (c) 2012, 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.
 
 interface TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   Type getType(TypeAnnotation annotation);
 }
 
@@ skipping 1290 matching lines @@
       getter = field.getter;
     }
 
     visit(node.argumentsNode);
 
     // TODO(ngeoffray): Check if the target can be assigned.
     // TODO(ngeoffray): Warn if target is null and the send is
     // unqualified.
 
     Selector selector = mapping.getSelector(node);
-    Identifier identifier = node.assignmentOperator;
-    bool isCompound = identifier.source.stringValue !== '=';
-    if (isCompound) {
+    String source = node.assignmentOperator.source.stringValue;
+    bool isComplex = source !== '=';
+    if (isComplex) {
       if (selector.isSetter()) {
         useElement(node.selector, getter);
         registerSend(new Selector.getterFrom(selector), getter);
       } else {
         // TODO(kasperl): If [getter] is resolved, it will actually
         // refer to the []= operator which isn't the one we want to
-        // register here. We should consider using some notation of
+        // register here. We should consider using some notion of
         // abstract indexable element that we can resolve to so we can
         // distinguish the two.
         assert(selector.isIndexSet());
         registerSend(new Selector.index(), null);
       }
+
+      // Make sure we include the + and - operators if we are using
+      // the ++ and -- ones.
+      void registerBinaryOperator(SourceString name) {
+        Selector binop = new Selector.binaryOperator(name);
+        world.registerDynamicInvocation(binop.name, binop);
+      }
+      if (source === '++') registerBinaryOperator(const SourceString('+'));
+      if (source === '--') registerBinaryOperator(const SourceString('-'));
     }
 
     registerSend(selector, setter);
     return useElement(node, setter);
   }
 
   void registerSend(Selector selector, Element target) {
     if (target === null || target.isInstanceMember()) {
       if (selector.isGetter()) {
         world.registerDynamicGetter(selector.name, selector);
@@ skipping 1094 matching lines @@
   TopScope(LibraryElement library) : super(null, library);
   Element lookup(SourceString name) {
     return library.find(name);
   }
 
   Element add(Element newElement) {
     throw "Cannot add an element in the top scope";
   }
   String toString() => '$element';
 }