Support default constructors in analyzer2dart.

pkg/analyzer2dart/lib/src/cps_generator.dart

Index: pkg/analyzer2dart/lib/src/cps_generator.dart
diff --git a/pkg/analyzer2dart/lib/src/cps_generator.dart b/pkg/analyzer2dart/lib/src/cps_generator.dart
index 7a4499ac9434b2753abecc7fc76a2d4b8fe2fb8c..0d73e9169ab9bca97f31d30d26930122fa11f83c 100644
--- a/pkg/analyzer2dart/lib/src/cps_generator.dart
+++ b/pkg/analyzer2dart/lib/src/cps_generator.dart
@@ -56,16 +56,15 @@ class CpsElementVisitor extends analyzer.SimpleElementVisitor<ir.Node> {
   @override
   ir.ExecutableDefinition visitConstructorElement(
       analyzer.ConstructorElement element) {
+    if (element.isSynthetic) {
+      // Don't generate CPS for synthetic (default) constructors.

[sigurdm, 2015/02/10 09:37:56]

For the js-case it makes sense to represent these explicitly.
Also we ideally want a check in the dart2dart emitter that excludes any
constructor that is identical to the default one.

[Johnni Winther, 2015/02/10 13:51:57]

Reverted.

+      return null;
+    }
     CpsGeneratingVisitor visitor = new CpsGeneratingVisitor(converter, element);
     if (!element.isFactory) {
       ConstructorDeclaration constructorDeclaration = node;
-      FunctionBody body;
-      if (constructorDeclaration != null) {
-        body = constructorDeclaration.body;
-      } else {
-        assert(element.isSynthetic);
-      }
-      return visitor.handleConstructorDeclaration(element, body);
+      return visitor.handleConstructorDeclaration(element,
+          constructorDeclaration.body);
     }
     // TODO(johnniwinther): Support factory constructors.
     return null;