Support closures inside initializers.

lib/compiler/implementation/ssa/codegen.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.
 
 part of ssa;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 141 matching lines @@
       FunctionSignature params = functionElement.computeSignature(compiler);
       TreeElements elements =
           compiler.enqueuer.resolution.getCachedElements(element);
       params.orderedForEachParameter((Element element) {
         if (elements.isParameterChecked(element)) {
           Element checkResultElement =
               closureData.parametersWithSentinel[element];
           addBackendParameter(checkResultElement, parameters, parameterNames);
         }
       });
+      // Put the box parameter.

[ahe, 2012/11/06 15:14:22]

What does this comment mean?

+      ClosureScope scopeData = closureData.capturingScopes[node];
+      if (scopeData != null) {
+        addBackendParameter(scopeData.boxElement, parameters, parameterNames);
+      }
     }
   }
 
   CodeBuffer generateBailoutMethod(WorkItem work, HGraph graph) {
     return measure(() {
       compiler.tracer.traceGraph("codegen-bailout", graph);
 
       Map<Element, String> parameterNames = getParameterNames(work);
       List<js.Parameter> parameters = <js.Parameter>[];
       parameterNames.forEach((element, name) {
@@ skipping 2859 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }