Replace ${name} with $name where possible.

pkg/analyzer/test/generated/element_test.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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.element_test;
 
 import 'package:analyzer/src/generated/java_core.dart';
@@ skipping 3347 matching lines @@
 
   void test_isSubtypeOf_subtypeOfSomeElement() {
     // Subtypes of elements are sub types
     JUnitTestCase.assertTrue(_typeB.isSubtypeOf(_uA));
   }
 
   void test_nestedUnionsCollapse() {
     UnionType u = UnionTypeImpl.union([_uAB, _typeA]) as UnionType;
     for (DartType t in u.elements) {
       if (t is UnionType) {
-        JUnitTestCase.fail("Expected only non-union types but found ${t}!");
+        JUnitTestCase.fail("Expected only non-union types but found $t!");
       }
     }
   }
 
   void test_noLossage() {
     UnionType u = UnionTypeImpl.union([_typeA, _typeB, _typeB, _typeA, _typeB, _typeB]) as UnionType;
     Set<DartType> elements = u.elements;
     JUnitTestCase.assertTrue(elements.contains(_typeA));
     JUnitTestCase.assertTrue(elements.contains(_typeB));
     JUnitTestCase.assertTrue(elements.length == 2);
@@ skipping 101 matching lines @@
   runReflectiveTests(UnionTypeImplTest);
   runReflectiveTests(VoidTypeImplTest);
   runReflectiveTests(ClassElementImplTest);
   runReflectiveTests(CompilationUnitElementImplTest);
   runReflectiveTests(ElementLocationImplTest);
   runReflectiveTests(ElementImplTest);
   runReflectiveTests(HtmlElementImplTest);
   runReflectiveTests(LibraryElementImplTest);
   runReflectiveTests(MultiplyDefinedElementImplTest);
 }