Don't hide interceptors in mirrors.

sdk/lib/_internal/compiler/implementation/js_backend/backend.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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 540 matching lines @@
 
     jsIndexingBehaviorInterface =
         compiler.findHelper('JavaScriptIndexingBehavior');
 
     specialOperatorEqClasses
         ..add(compiler.objectClass)
         ..add(jsInterceptorClass)
         ..add(jsNullClass);
 
     validateInterceptorImplementsAllObjectMethods(jsInterceptorClass);
+    // The null-interceptor must also implement *all* methods.
+    validateInterceptorImplementsAllObjectMethods(jsNullClass);
 
     typeVariableClass = compiler.findHelper('TypeVariable');
 
     indexablePrimitiveType = new TypeMask.nonNullSubtype(jsIndexableClass);
     readableArrayType = new TypeMask.nonNullSubclass(jsArrayClass);
     mutableArrayType = new TypeMask.nonNullSubclass(jsMutableArrayClass);
     fixedArrayType = new TypeMask.nonNullExact(jsFixedArrayClass);
     extendableArrayType = new TypeMask.nonNullExact(jsExtendableArrayClass);
     nonNullType = compiler.typesTask.dynamicType.nonNullable();
 
     noSideEffectsClass = compiler.findHelper('NoSideEffects');
     noThrowsClass = compiler.findHelper('NoThrows');
     noInlineClass = compiler.findHelper('NoInline');
     irRepresentationClass = compiler.findHelper('IrRepresentation');
   }
 
   void validateInterceptorImplementsAllObjectMethods(
       ClassElement interceptorClass) {
     if (interceptorClass == null) return;
     interceptorClass.ensureResolved(compiler);
     compiler.objectClass.forEachMember((_, Element member) {
       if (member.isGenerativeConstructor()) return;
       Element interceptorMember = interceptorClass.lookupMember(member.name);
       // Interceptors must override all Object methods due to calling convention
       // differences.
-      assert(interceptorMember.getEnclosingClass() != compiler.objectClass);
+      assert(interceptorMember.getEnclosingClass() == interceptorClass);
     });
   }
 
   void addInterceptorsForNativeClassMembers(
       ClassElement cls, Enqueuer enqueuer) {
     if (enqueuer.isResolutionQueue) {
       cls.ensureResolved(compiler);
       cls.forEachMember((ClassElement classElement, Element member) {
         if (member.name == Compiler.CALL_OPERATOR_NAME) {
           compiler.reportError(
@@ skipping 506 matching lines @@
 
   bool classNeedsRti(ClassElement cls) {
     return rti.classesNeedingRti.contains(cls.declaration) ||
         compiler.enabledRuntimeType;
   }
 
   bool isDefaultNoSuchMethodImplementation(Element element) {
     assert(element.name == Compiler.NO_SUCH_METHOD);
     ClassElement classElement = element.getEnclosingClass();
     return classElement == compiler.objectClass
-        || classElement == jsInterceptorClass;
+        || classElement == jsInterceptorClass
+        || classElement == jsNullClass;
   }
 
   bool isDefaultEqualityImplementation(Element element) {
     assert(element.name == '==');
     ClassElement classElement = element.getEnclosingClass();
     return classElement == compiler.objectClass
         || classElement == jsInterceptorClass
         || classElement == jsNullClass;
   }
 
@@ skipping 133 matching lines @@
 
   Element getDartClass(Element element) {
     for (ClassElement dartClass in implementationClasses.keys) {
       if (element == implementationClasses[dartClass]) {
         return dartClass;
       }
     }
     return element;
   }
 
-  Element getImplementationClass(Element element) {
-    for (ClassElement dartClass in implementationClasses.keys) {
-      if (element == dartClass) {
-        return implementationClasses[dartClass];
-      }
-    }
-    return element;
-  }
-
   /**
    * Returns the checked mode helper that will be needed to do a type check/type
    * cast on [type] at runtime. Note that this method is being called both by
    * the resolver with interface types (int, String, ...), and by the SSA
    * backend with implementation types (JSInt, JSString, ...).
    */
   CheckedModeHelper getCheckedModeHelper(DartType type, {bool typeCast}) {
     return getCheckedModeHelperInternal(
         type, typeCast: typeCast, nativeCheckOnly: false);
   }
@@ skipping 628 matching lines @@
   }
 }
 
 /// Records that [constant] is used by [user.element].
 class Dependency {
   final Constant constant;
   final TreeElements user;
 
   const Dependency(this.constant, this.user);
 }