Switch statement cleanups.

pkg/analyzer/lib/src/summary/resynthesize.dart

 // Copyright (c) 2015, 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 summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 932 matching lines @@
       case ReferenceKind.function:
       case ReferenceKind.propertyAccessor:
       case ReferenceKind.method:
       case ReferenceKind.prefix:
       case ReferenceKind.unresolved:
       case ReferenceKind.variable:
         // Should never happen.  Exported names never refer to import prefixes,
         // and they always refer to defined top-level entities.
         throw new StateError('Unexpected export name kind: ${exportName.kind}');
     }
+    return null;
   }
 
   /**
    * Build the export namespace for the library by aggregating together its
    * [publicNamespace] and [exportNames].
    */
   Namespace buildExportNamespace(
       Namespace publicNamespace, List<LinkedExportName> exportNames) {
     HashMap<String, Element> definedNames = new HashMap<String, Element>();
     // Start by populating all the public names from [publicNamespace].
@@ skipping 873 matching lines @@
   static String _getElementIdentifier(String name, ReferenceKind kind) {
     if (kind == ReferenceKind.topLevelPropertyAccessor ||
         kind == ReferenceKind.propertyAccessor) {
       if (!name.endsWith('=')) {
         return name + '?';
       }
     }
     return name;
   }
 }