Handle symbol literals in closed_world2_test

pkg/compiler/lib/src/resolution/resolution_strategy.dart

 // Copyright (c) 2017, 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 dart2js.resolution_strategy;
 
 import '../common.dart';
 import '../common_elements.dart';
 import '../common/backend_api.dart';
 import '../common/names.dart';
@@ skipping 335 matching lines @@
     }
     return member?.declaration;
   }
 
   @override
   ClassElement lookupClass(LibraryElement library, String name,
       {bool required: false}) {
     ClassElement cls = library.implementation.findLocal(name);
     if (cls == null && required) {
       throw new SpannableAssertionFailure(
-          cls,
+          library,
           "The library '${library.libraryName}' does not "
           "contain required class: '$name'.");
     }
     return cls?.declaration;
   }
 
   @override
   void forEachClass(LibraryElement library, void f(ClassElement cls)) {
     library.implementation.forEachLocalMember((member) {
       if (member.isClass) {
         f(member);
       }
     });
   }
 
   @override
   LibraryElement lookupLibrary(Uri uri, {bool required: false}) {
     LibraryElement library = _libraryProvider.lookupLibrary(uri);
     // If the script of the library is synthesized, the library does not exist
     // and we do not try to load the helpers.
     //
     // This could for example happen if dart:async is disabled, then loading it
     // should not try to find the given element.
     if (library != null && library.isSynthesized) {
       return null;
     }
     if (library == null && required) {
       throw new SpannableAssertionFailure(
-          library, "The library '${uri}' was not found.");
+          NO_LOCATION_SPANNABLE, "The library '${uri}' was not found.");
     }
     return library;
   }
 
   @override
   CallStructure getCallStructure(MethodElement method) {
     ResolutionFunctionType type = method.computeType(_resolution);
     return new CallStructure(
         type.parameterTypes.length +
             type.optionalParameterTypes.length +
@@ skipping 60 matching lines @@
     library.forEachLocalMember((Element element) {
       if (element.isClass) {
         ClassElement cls = element;
         if (checkJsInteropAnnotation(element)) {
           nativeBasicDataBuilder.markAsJsInteropClass(cls);
         }
       }
     });
   }
 }