Switch statement cleanups.

pkg/analyzer/lib/src/dart/element/element.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 analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 2246 matching lines @@
         RedirectingConstructorInvocation initializer =
             AstFactory.redirectingConstructorInvocation2(
                 name.isNotEmpty ? name : null, arguments);
         ConstructorElement element = name.isEmpty
             ? enclosingElement.unnamedConstructor
             : enclosingElement.getNamedConstructor(name);
         initializer.staticElement = element;
         initializer.constructorName?.staticElement = element;
         return initializer;
     }
+    return null;
   }
 }
 
 /**
  * A [TopLevelVariableElement] for a top-level 'const' variable that has an
  * initializer.
  */
 class ConstTopLevelVariableElementImpl extends TopLevelVariableElementImpl
     with ConstVariableElement {
   /**
@@ skipping 6164 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }