Migrate test block 113 to Dart 2.0.

tests/language/generic_creation_test.dart

-// Copyright (c) 2012, 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.
-
-import "package:expect/expect.dart";
-
-class A<X, Y, Z> {
-  shift() => new A<Z, X, Y>();
-  swap() => new A<Z, Y, X>();
-  first() => new A<X, X, X>();
-  last() => new A<Z, Z, Z>();
-  wrap() => new A<A<X, X, X>, A<Y, Y, Y>, A<Z, Z, Z>>();
-}
-
-class B extends A<U, V, W> {}
-
-class C<T> extends A<U, T, W> {}
-
-class D<X, Y, Z> extends A<Y, Z, X> {}
-
-class U {}
-
-class V {}
-
-class W {}
-
-sameType(a, b) => Expect.equals(a.runtimeType, b.runtimeType);
-
-main() {
-  A a = new A<U, V, W>();
-  sameType(new A<W, U, V>(), a.shift());
-  sameType(new A<W, V, U>(), a.swap());
-  sameType(new A<U, U, U>(), a.first());
-  sameType(new A<W, W, W>(), a.last());
-  sameType(new A<A<U, U, U>, A<V, V, V>, A<W, W, W>>(), a.wrap());
-  B b = new B();
-  sameType(new A<A<U, U, U>, A<V, V, V>, A<W, W, W>>(), b.wrap());
-  C c = new C<V>();
-  sameType(new A<A<U, U, U>, A<V, V, V>, A<W, W, W>>(), c.wrap());
-  D d = new D<U, V, W>();
-  sameType(new A<A<V, V, V>, A<W, W, W>, A<U, U, U>>(), d.wrap());
-}