Migrate test block 113 to Dart 2.0.

tests/language_2/generalized_void_syntax_test.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.
 
 // Testing that the reserved word `void` is allowed to occur as a type, not
 // just as a return type.
 
 class A<T> {
   final T t;
   const A(this.t);
@@ skipping 50 matching lines @@
   A<void> get g4 => new A<void>(null);
   void set s3(void x) => null;
   void set s4(A<void> x) => null;
   void m5(void x, [void y]) => null;
   void m6(void x, {void y}) => null;
   A<void> m7(A<void> x, [A<void> y]) => null;
   A<void> m8(A<void> x, {A<void> y}) => null;
 
   // Ensure that all members are used, and use `void` in expressions.
   void run() {
-    var ignore = [
+    List<dynamic> ignore = [
       x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, //
       g1, g2, g3, g4,
     ];
     
     s1 = null;
     s2 = new A<void>(null);
     s3 = null;
     s4 = new A<void>(null);
     m1(null, null);
     m2(null, y: null);
     m3(null, new A<void>(null));
     m4(null, y: new A<void>(null));
     m5(null, null);
     m6(null, y: null);
     m7(null, new A<void>(null));
     m8(null, y: new A<void>(null));
 
     void pretendToUse(dynamic x) => null;
     pretendToUse(<void>[]);
     pretendToUse(<void, void>{});
     pretendToUse(<A<void>>[]);
     pretendToUse(<A<void>, A<void>>{});
   }
 }
 
 // Testing syntax, just enforce compilation.
 main() {
-  var ignore = [x1, x2, x3, x4, x5, x6, x7, x8, g1, g2];
+  List<dynamic> ignore = [x1, x2, x3, x4, x5, x6, x7, x8, g1, g2];
 
   s1 = null;
   s2 = new A<void>(null);
   m1(null, null);
   m2(null, y: null);
   m3(null, null);
   m4(null, y: null);
   new C().run();
 }