Support closures inside initializers.

lib/compiler/implementation/closure.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.
 
 library closureToClassMapper;
 
 import "elements/elements.dart";
 import "dart2jslib.dart";
 import "tree/tree.dart";
 import "util/util.dart";
@@ skipping 27 matching lines @@
       }
       assert(closureMappingCache[node] != null);
       return closureMappingCache[node];
     });
   }
 
   ClosureClassMap getMappingForNestedFunction(FunctionExpression node) {
     return measure(() {
       ClosureClassMap nestedClosureData = closureMappingCache[node];
       if (nestedClosureData == null) {
-        // TODO(floitsch): we can only assume that the reason for not having a
-        // closure data here is, because the function is inside an initializer.
-        compiler.unimplemented("Closures inside initializers", node: node);
+        compiler.internalError("No closure cache", node: node);
       }
       return nestedClosureData;
     });
   }
 }
 
 class ClosureFieldElement extends Element {
   ClosureFieldElement(SourceString name, ClassElement enclosing)
       : super(name, ElementKind.FIELD, enclosing);
 
@@ skipping 542 matching lines @@
     if (element.isParameter()) {
       // TODO(ahe): This is a hack. This method should *not* call
       // visitChildren.
       return node.name.accept(this);
     }
 
     visitInvokable(element, node, () {
       // TODO(ahe): This is problematic. The backend should not repeat
       // the work of the resolver. It is the resolver's job to create
       // parameters, etc. Other phases should only visit statements.
-      // TODO(floitsch): we avoid visiting the initializers on purpose so that
-      // we get an error-message later in the builder.
       if (node.parameters != null) node.parameters.accept(this);
+      if (node.initializers != null) node.initializers.accept(this);
       if (node.body != null) node.body.accept(this);
     });
   }
 
   visitFunctionDeclaration(FunctionDeclaration node) {
     node.visitChildren(this);
     declareLocal(elements[node]);
   }
 
   visitTryStatement(TryStatement node) {
     // TODO(ngeoffray): implement finer grain state.
     bool oldInTryStatement = inTryStatement;
     inTryStatement = true;
     node.visitChildren(this);
     inTryStatement = oldInTryStatement;
   }
 }