Dart2js option to dump info about compilation

sdk/lib/_internal/compiler/implementation/closure.dart

Index: sdk/lib/_internal/compiler/implementation/closure.dart
diff --git a/sdk/lib/_internal/compiler/implementation/closure.dart b/sdk/lib/_internal/compiler/implementation/closure.dart
index 2b0849402d20b22f767e7bcf383771021a762cb3..71ce0cb1f3a4868fd2677740641389ff683d4b2a 100644
--- a/sdk/lib/_internal/compiler/implementation/closure.dart
+++ b/sdk/lib/_internal/compiler/implementation/closure.dart
@@ -75,6 +75,8 @@ class ClosureFieldElement extends ElementX implements VariableElement {
   /// The source variable this element refers to.
   final Element variableElement;
 
+  List<FunctionElement> nestedClosures = new List<FunctionElement>();

[ngeoffray, 2013/12/05 09:29:28]

What is this for a ClosureFieldElement? Please add a comment.

[sigurdm, 2013/12/05 11:35:03]

Actually nothing - I had misunderstood what a ClosureFieldElement is.

I added a class FieldElement subclass of VariableElement - so only fields and
functions have nestedClosures.

+
   ClosureFieldElement(String name,
                       this.variableElement,
                       ClassElement enclosing)
@@ -700,6 +702,8 @@ class ClosureTranslator extends Visitor {
         new FunctionElementX.from(Compiler.CALL_OPERATOR_NAME,
                                   element,
                                   globalizedElement);
+    ClosureContainer enclosing = element.enclosingElement;
+    enclosing.nestedClosures.add(callElement);
     globalizedElement.addMember(callElement, compiler);
     // The nested function's 'this' is the same as the one for the outer
     // function. It could be [null] if we are inside a static method.