Add dependencies to type variables used in the super type declaration, but do

pkg/compiler/lib/src/deferred_load.dart

 // Copyright (c) 2014, 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 deferred_load;
 
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
 import 'constants/expressions.dart' show ConstantExpression;
@@ skipping 301 matching lines @@
           collectTypeDependencies(argumentType);
         }
         for (ResolutionDartType argumentType in type.namedParameterTypes) {
           collectTypeDependencies(argumentType);
         }
         collectTypeDependencies(type.returnType);
       } else if (type is ResolutionTypedefType) {
         elements.add(type.element);
         collectTypeDependencies(type.unaliased);
       } else if (type is ResolutionInterfaceType) {
-        if (elements.add(type.element)) {
-          collectTypeDependencies(type.element.supertype);
-        }
+        elements.add(type.element);
       }
     }
 
     /// Collects all direct dependencies of [element].
     ///
     /// The collected dependent elements and constants are are added to
     /// [elements] and [constants] respectively.
     void collectDependencies(Element element) {
       // TODO(johnniwinther): Remove this when [AbstractFieldElement] has been
       // removed.
@@ skipping 116 matching lines @@
         MemberElement element = _element;
         if (!compiler.resolutionWorldBuilder.isMemberUsed(element)) return;
         if (!isMirrorUsage && !element.isInstanceMember) return;
         elements.add(element);
         collectDependencies(element);
       }
 
       ClassElement cls = element.declaration;
       cls.implementation.forEachMember(addLiveInstanceMember);
       for (ResolutionInterfaceType type in cls.implementation.allSupertypes) {
-        elements.add(type.element.implementation);
+        collectTypeDependencies(type);
       }
       elements.add(cls.implementation);
     } else if (Elements.isStaticOrTopLevel(element) || element.isConstructor) {
       elements.add(element);
       collectDependencies(element);
     }
     if (element.isGenerativeConstructor) {
       // When instantiating a class, we record a reference to the
       // constructor, not the class itself.  We must add all the
       // instance members of the constructor's class.
@@ skipping 652 matching lines @@
 
   bool operator ==(other) {
     if (other is! _DeclaredDeferredImport) return false;
     return declaration == other.declaration;
   }
 
   int get hashCode => declaration.hashCode * 17;
 
   String toString() => '$declaration';
 }