diff --git a/modules/angular2/src/core/annotations_impl/di.ts b/modules/angular2/src/core/annotations_impl/di.ts
index 9ed4933d4d..8d297ac1d3 100644
--- a/modules/angular2/src/core/annotations_impl/di.ts
+++ b/modules/angular2/src/core/annotations_impl/di.ts
@@ -1,4 +1,4 @@
-import {CONST} from 'angular2/src/facade/lang';
+import {CONST, stringify} from 'angular2/src/facade/lang';
 import {DependencyAnnotation} from 'angular2/src/di/annotations_impl';
 
 /**
@@ -41,6 +41,7 @@ export class Attribute extends DependencyAnnotation {
     // account.
     return this;
   }
+  toString() { return `@Attribute(${stringify(this.attributeName)})`; }
 }
 
 /**
@@ -53,4 +54,5 @@ export class Attribute extends DependencyAnnotation {
 @CONST()
 export class Query extends DependencyAnnotation {
   constructor(public directive: any) { super(); }
+  toString() { return `@Query(${stringify(this.directive)})`; }
 }
diff --git a/modules/angular2/src/core/annotations_impl/visibility.ts b/modules/angular2/src/core/annotations_impl/visibility.ts
index 324f27edf1..a8daedaaaf 100644
--- a/modules/angular2/src/core/annotations_impl/visibility.ts
+++ b/modules/angular2/src/core/annotations_impl/visibility.ts
@@ -9,6 +9,9 @@ export class Visibility extends DependencyAnnotation {
   }
 
   get includeSelf(): boolean { return isBlank(this._includeSelf) ? false : this._includeSelf; }
+  toString() {
+    return `@Visibility(depth: ${this.depth}, crossComponentBoundaries: ${this.crossComponentBoundaries}, includeSelf: ${this.includeSelf}})`;
+  }
 }
 
 /**
@@ -51,6 +54,7 @@ export class Visibility extends DependencyAnnotation {
 @CONST()
 export class Self extends Visibility {
   constructor() { super(0, false, true); }
+  toString() { return `@Self()`; }
 }
 
 // make constants after switching to ts2dart
@@ -102,6 +106,7 @@ export var self = new Self();
 @CONST()
 export class Parent extends Visibility {
   constructor({self}: {self?: boolean} = {}) { super(1, false, self); }
+  toString() { return `@Parent(self: ${this.includeSelf}})`; }
 }
 
 /**
@@ -164,6 +169,7 @@ export class Parent extends Visibility {
 @CONST()
 export class Ancestor extends Visibility {
   constructor({self}: {self?: boolean} = {}) { super(999999, false, self); }
+  toString() { return `@Ancestor(self: ${this.includeSelf}})`; }
 }
 
 /**
@@ -203,4 +209,5 @@ export class Ancestor extends Visibility {
 @CONST()
 export class Unbounded extends Visibility {
   constructor({self}: {self?: boolean} = {}) { super(999999, true, self); }
+  toString() { return `@Unbounded(self: ${this.includeSelf}})`; }
 }
diff --git a/modules/angular2/src/di/annotations_impl.ts b/modules/angular2/src/di/annotations_impl.ts
index 44aaf6ff96..566e94a27f 100644
--- a/modules/angular2/src/di/annotations_impl.ts
+++ b/modules/angular2/src/di/annotations_impl.ts
@@ -1,4 +1,4 @@
-import {CONST} from "angular2/src/facade/lang";
+import {CONST, stringify} from "angular2/src/facade/lang";
 
 /**
  * A parameter annotation that specifies a dependency.
@@ -15,6 +15,7 @@ import {CONST} from "angular2/src/facade/lang";
 @CONST()
 export class Inject {
   constructor(public token) {}
+  toString() { return `@Inject(${stringify(this.token)})`; }
 }
 
 /**
@@ -33,6 +34,7 @@ export class Inject {
 @CONST()
 export class InjectPromise {
   constructor(public token) {}
+  toString() { return `@InjectPromise(${stringify(this.token)})`; }
 }
 
 /**
@@ -51,6 +53,7 @@ export class InjectPromise {
 @CONST()
 export class InjectLazy {
   constructor(public token) {}
+  toString() { return `@InjectLazy(${stringify(this.token)})`; }
 }
 
 /**
@@ -69,6 +72,7 @@ export class InjectLazy {
  */
 @CONST()
 export class Optional {
+  toString() { return `@Optional()`; }
 }
 
 /**
diff --git a/modules/angular2/src/di/binding.ts b/modules/angular2/src/di/binding.ts
index 32f5d5376e..2d5e7db41e 100644
--- a/modules/angular2/src/di/binding.ts
+++ b/modules/angular2/src/di/binding.ts
@@ -437,22 +437,27 @@ export class BindingBuilder {
   }
 }
 
-function _constructDependencies(factoryFunction: Function, dependencies: List<any>) {
-  return isBlank(dependencies) ?
-             _dependenciesFor(factoryFunction) :
-             ListWrapper.map(dependencies, (t) => _extractToken(factoryFunction, t));
+function _constructDependencies(factoryFunction: Function,
+                                dependencies: List<any>): List<Dependency> {
+  if (isBlank(dependencies)) {
+    return _dependenciesFor(factoryFunction);
+  } else {
+    var params: List<List<any>> = ListWrapper.map(dependencies, (t) => [t]);
+    return ListWrapper.map(dependencies, (t) => _extractToken(factoryFunction, t, params));
+  }
 }
 
-function _dependenciesFor(typeOrFunc): List<any> {
+function _dependenciesFor(typeOrFunc): List<Dependency> {
   var params = reflector.parameters(typeOrFunc);
   if (isBlank(params)) return [];
   if (ListWrapper.any(params, (p) => isBlank(p))) {
-    throw new NoAnnotationError(typeOrFunc);
+    throw new NoAnnotationError(typeOrFunc, params);
   }
-  return ListWrapper.map(params, (p) => _extractToken(typeOrFunc, p));
+  return ListWrapper.map(params, (p: List<any>) => _extractToken(typeOrFunc, p, params));
 }
 
-function _extractToken(typeOrFunc, annotations) {
+function _extractToken(typeOrFunc, annotations /*List<any> | any*/,
+                       params: List<List<any>>): Dependency {
   var depProps = [];
   var token = null;
   var optional = false;
@@ -496,7 +501,7 @@ function _extractToken(typeOrFunc, annotations) {
   if (isPresent(token)) {
     return _createDependency(token, asPromise, lazy, optional, depProps);
   } else {
-    throw new NoAnnotationError(typeOrFunc);
+    throw new NoAnnotationError(typeOrFunc, params);
   }
 }
 
diff --git a/modules/angular2/src/di/exceptions.ts b/modules/angular2/src/di/exceptions.ts
index d6ed807651..5b2098eb3e 100644
--- a/modules/angular2/src/di/exceptions.ts
+++ b/modules/angular2/src/di/exceptions.ts
@@ -1,5 +1,5 @@
 import {ListWrapper, List} from 'angular2/src/facade/collection';
-import {stringify, BaseException} from 'angular2/src/facade/lang';
+import {stringify, BaseException, isBlank} from 'angular2/src/facade/lang';
 
 function findFirstClosedCycle(keys: List<any>): List<any> {
   var res = [];
@@ -179,9 +179,19 @@ export class InvalidBindingError extends BaseException {
 export class NoAnnotationError extends BaseException {
   name: string;
   message: string;
-  constructor(typeOrFunc) {
+  constructor(typeOrFunc, params: List<List<any>>) {
     super();
-    this.message = "Cannot resolve all parameters for " + stringify(typeOrFunc) + ". " +
+    var signature = ListWrapper.create();
+    for (var i = 0, ii = params.length; i < ii; i++) {
+      var parameter = params[i];
+      if (isBlank(parameter) || parameter.length == 0) {
+        ListWrapper.push(signature, '?');
+      } else {
+        ListWrapper.push(signature, ListWrapper.map(parameter, stringify).join(' '));
+      }
+    }
+    this.message = "Cannot resolve all parameters for " + stringify(typeOrFunc) + "(" +
+                   signature.join(', ') + "). " +
                    'Make sure they all have valid type or annotations.';
   }
 
diff --git a/modules/angular2/src/di/forward_ref.ts b/modules/angular2/src/di/forward_ref.ts
index 9e103d4899..b94faa1c91 100644
--- a/modules/angular2/src/di/forward_ref.ts
+++ b/modules/angular2/src/di/forward_ref.ts
@@ -1,4 +1,4 @@
-import {Type} from 'angular2/src/facade/lang';
+import {Type, stringify} from 'angular2/src/facade/lang';
 
 export interface ForwardRefFn { (): any; }
 
@@ -30,6 +30,7 @@ export interface ForwardRefFn { (): any; }
  */
 export function forwardRef(forwardRefFn: ForwardRefFn): Type {
   (<any>forwardRefFn).__forward_ref__ = forwardRef;
+  (<any>forwardRefFn).toString = function() { return stringify(this()); };
   return (<Type><any>forwardRefFn);
 }
 
diff --git a/modules/angular2/src/di/type_info.dart b/modules/angular2/src/di/type_info.dart
new file mode 100644
index 0000000000..10d02c4a23
--- /dev/null
+++ b/modules/angular2/src/di/type_info.dart
@@ -0,0 +1,4 @@
+library angular2.di.type_info;
+
+// In dart always return empty, as we can get the co
+argsLength(Type type) => 0;
diff --git a/modules/angular2/src/di/type_info.ts b/modules/angular2/src/di/type_info.ts
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/modules/angular2/src/reflection/platform_reflection_capabilities.ts b/modules/angular2/src/reflection/platform_reflection_capabilities.ts
new file mode 100644
index 0000000000..58830d5d8b
--- /dev/null
+++ b/modules/angular2/src/reflection/platform_reflection_capabilities.ts
@@ -0,0 +1,13 @@
+import {Type} from 'angular2/src/facade/lang';
+import {GetterFn, SetterFn, MethodFn} from './types';
+import {List} from 'angular2/src/facade/collection';
+
+export interface PlatformReflectionCapabilities {
+  factory(type: Type): Function;
+  interfaces(type: Type): List<any>;
+  parameters(type: Type): List<List<any>>;
+  annotations(type: Type): List<any>;
+  getter(name: string): GetterFn;
+  setter(name: string): SetterFn;
+  method(name: string): MethodFn;
+}
diff --git a/modules/angular2/src/reflection/reflection.dart b/modules/angular2/src/reflection/reflection.dart
index 8c81ee3671..8c8849b34e 100644
--- a/modules/angular2/src/reflection/reflection.dart
+++ b/modules/angular2/src/reflection/reflection.dart
@@ -3,13 +3,18 @@ library reflection.reflection;
 import 'reflector.dart';
 import 'types.dart';
 export 'reflector.dart';
+import 'platform_reflection_capabilities.dart';
 import 'package:angular2/src/facade/lang.dart';
 
-class NoReflectionCapabilities implements IReflectionCapabilities {
+class NoReflectionCapabilities implements PlatformReflectionCapabilities {
   Function factory(Type type) {
     throw "Cannot find reflection information on ${stringify(type)}";
   }
 
+  List interfaces(Type type) {
+    throw "Cannot find reflection information on ${stringify(type)}";
+  }
+
   List parameters(Type type) {
     throw "Cannot find reflection information on ${stringify(type)}";
   }
diff --git a/modules/angular2/src/reflection/reflection_capabilities.dart b/modules/angular2/src/reflection/reflection_capabilities.dart
index 7e28114042..14a51da509 100644
--- a/modules/angular2/src/reflection/reflection_capabilities.dart
+++ b/modules/angular2/src/reflection/reflection_capabilities.dart
@@ -3,8 +3,9 @@ library reflection.reflection_capabilities;
 import 'package:angular2/src/facade/lang.dart';
 import 'types.dart';
 import 'dart:mirrors';
+import 'platform_reflection_capabilities.dart';
 
-class ReflectionCapabilities implements IReflectionCapabilities {
+class ReflectionCapabilities implements PlatformReflectionCapabilities {
   ReflectionCapabilities([metadataReader]) {}
 
   Function factory(Type type) {
diff --git a/modules/angular2/src/reflection/reflection_capabilities.ts b/modules/angular2/src/reflection/reflection_capabilities.ts
index ecbe2cf69d..25f7abf84a 100644
--- a/modules/angular2/src/reflection/reflection_capabilities.ts
+++ b/modules/angular2/src/reflection/reflection_capabilities.ts
@@ -1,8 +1,9 @@
 import {Type, isPresent, global, stringify, BaseException} from 'angular2/src/facade/lang';
 import {List, ListWrapper} from 'angular2/src/facade/collection';
-import {GetterFn, SetterFn, MethodFn, IReflectionCapabilities} from './types';
+import {GetterFn, SetterFn, MethodFn} from './types';
+import {PlatformReflectionCapabilities} from 'platform_reflection_capabilities';
 
-export class ReflectionCapabilities implements IReflectionCapabilities {
+export class ReflectionCapabilities implements PlatformReflectionCapabilities {
   private _reflect: any;
 
   constructor(reflect?: any) { this._reflect = isPresent(reflect) ? reflect : global.Reflect; }
diff --git a/modules/angular2/src/reflection/reflector.ts b/modules/angular2/src/reflection/reflector.ts
index 05c2fe6c9f..5582ece148 100644
--- a/modules/angular2/src/reflection/reflector.ts
+++ b/modules/angular2/src/reflection/reflector.ts
@@ -7,17 +7,19 @@ import {
   StringMap,
   StringMapWrapper
 } from 'angular2/src/facade/collection';
-import {SetterFn, GetterFn, MethodFn, IReflectionCapabilities} from './types';
-export {SetterFn, GetterFn, MethodFn, IReflectionCapabilities} from './types';
+import {SetterFn, GetterFn, MethodFn} from './types';
+import {PlatformReflectionCapabilities} from './platform_reflection_capabilities';
+export {SetterFn, GetterFn, MethodFn} from './types';
+export {PlatformReflectionCapabilities} from './platform_reflection_capabilities';
 
 export class Reflector {
   _typeInfo: Map<Type, any>;
   _getters: Map<string, GetterFn>;
   _setters: Map<string, SetterFn>;
   _methods: Map<string, MethodFn>;
-  reflectionCapabilities: IReflectionCapabilities;
+  reflectionCapabilities: PlatformReflectionCapabilities;
 
-  constructor(reflectionCapabilities: IReflectionCapabilities) {
+  constructor(reflectionCapabilities: PlatformReflectionCapabilities) {
     this._typeInfo = MapWrapper.create();
     this._getters = MapWrapper.create();
     this._setters = MapWrapper.create();
diff --git a/modules/angular2/src/reflection/types.dart b/modules/angular2/src/reflection/types.dart
index 1e0b46b765..d1bc7fc9a6 100644
--- a/modules/angular2/src/reflection/types.dart
+++ b/modules/angular2/src/reflection/types.dart
@@ -3,13 +3,3 @@ library reflection.types;
 typedef SetterFn(Object obj, value);
 typedef GetterFn(Object obj);
 typedef MethodFn(Object obj, List args);
-
-abstract class IReflectionCapabilities {
-  Function factory(Type type);
-  List<List<Type>> parameters(Type type);
-  List<Type> interfaces(Type type);
-  List annotations(Type type);
-  GetterFn getter(String name);
-  SetterFn setter(String name);
-  MethodFn method(String name);
-}
diff --git a/modules/angular2/src/reflection/types.ts b/modules/angular2/src/reflection/types.ts
index 88c0fde461..f416eda1b3 100644
--- a/modules/angular2/src/reflection/types.ts
+++ b/modules/angular2/src/reflection/types.ts
@@ -1,21 +1,13 @@
 import {Type} from 'angular2/src/facade/lang';
 import {List} from 'angular2/src/facade/collection';
 
-// HACK: workaround for Traceur behavior.
-// It expects all transpiled modules to contain this marker.
-// TODO: remove this when we no longer use traceur
-export var __esModule = true;
+export {Function as GetterFn};
+export {Function as SetterFn};
+export {Function as MethodFn};
 
+// TODO replace once dgeni is fixed
+/**
 export type SetterFn = (obj: any, value: any) => void;
 export type GetterFn = (obj: any) => any;
 export type MethodFn = (obj: any, args: List<any>) => any;
-
-export interface IReflectionCapabilities {
-  factory(type: Type): Function;
-  parameters(type: Type): List<List<any>>;
-  interfaces(type: Type): List<any>;
-  annotations(type: Type): List<any>;
-  getter(name: string): GetterFn;
-  setter(name: string): SetterFn;
-  method(name: string): MethodFn;
-}
+**/
diff --git a/modules/angular2/test/di/injector_spec.ts b/modules/angular2/test/di/injector_spec.ts
index 2b6574a866..b1de28cf3f 100644
--- a/modules/angular2/test/di/injector_spec.ts
+++ b/modules/angular2/test/di/injector_spec.ts
@@ -106,7 +106,7 @@ export function main() {
 
     it('should throw when no type and not @Inject', () => {
       expect(() => Injector.resolveAndCreate([NoAnnotations]))
-          .toThrowError('Cannot resolve all parameters for NoAnnotations. ' +
+          .toThrowError('Cannot resolve all parameters for NoAnnotations(?). ' +
                         'Make sure they all have valid type or annotations.');
     });