Implement super.foo = expression.

dart/lib/compiler/implementation/ssa/builder.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.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 2403 matching lines @@
   visitSendSet(SendSet node) {
     Operator op = node.assignmentOperator;
     if (node.isSuperCall) {
       Element element = elements[node];
       if (element === null) return generateSuperNoSuchMethodSend(node);
       HInstruction target = new HStatic(element);
       HInstruction context = localsHandler.readThis();
       add(target);
       var inputs = <HInstruction>[target, context];
       addDynamicSendArgumentsToList(node, inputs);
-      push(new HInvokeSuper(inputs));
+      if (node.assignmentOperator.source.stringValue !== '=') {
+        compiler.unimplemented('complex super assignment',
+                               node: node.assignmentOperator);
+      }
+      push(new HInvokeSuper(inputs, isSetter: true));
     } else if (node.isIndex) {
       if (!methodInterceptionEnabled) {
         assert(op.source.stringValue === '=');
         visitDynamicSend(node);
       } else {
         HStatic target = new HStatic(
             interceptors.getIndexAssignmentInterceptor());
         add(target);
         visit(node.receiver);
         HInstruction receiver = pop();
@@ skipping 1186 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }