Migrate test block 113 to Dart 2.0.

tests/language/generic_closure_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.
-// Dart test program for constructors and initializers.
-
-// Check that generic closures are properly instantiated.
-
-import 'package:expect/expect.dart';
-
-typedef T F<T>(T x);
-typedef R G<T, R>(T x);
-
-class C<T> {
-  get f => (T x) => 2 * x;
-  T g(T x) => 3 * x;
-}
-
-main() {
-  var c = new C<int>();
-  var f = c.f;
-  var g = c.g;
-  Expect.equals(42, f(21));
-  Expect.equals(42, g(14));
-  Expect.isTrue(f is Function);
-  Expect.isTrue(g is Function);
-  Expect.isTrue(f is F);
-  Expect.isTrue(g is F);
-  Expect.isTrue(f is F<int>);
-  Expect.isTrue(g is F<int>);
-  Expect.isTrue(f is! F<bool>);
-  Expect.isTrue(g is! F<bool>);
-  Expect.isTrue(f is G<int, int>);
-  Expect.isTrue(g is G<int, int>);
-  Expect.isTrue(f is G<int, bool>);
-  Expect.isTrue(g is! G<int, bool>);
-  Expect.equals("(int) => dynamic", f.runtimeType.toString());
-  Expect.equals("(int) => int", g.runtimeType.toString());
-
-  c = new C<bool>();
-  f = c.f;
-  g = c.g;
-  Expect.isTrue(f is F);
-  Expect.isTrue(g is F);
-  Expect.isTrue(f is! F<int>);
-  Expect.isTrue(g is! F<int>);
-  Expect.isTrue(f is F<bool>);
-  Expect.isTrue(g is F<bool>);
-  Expect.equals("(bool) => dynamic", f.runtimeType.toString());
-  Expect.equals("(bool) => bool", g.runtimeType.toString());
-
-  c = new C();
-  f = c.f;
-  g = c.g;
-  Expect.isTrue(f is F);
-  Expect.isTrue(g is F);
-  Expect.isTrue(f is F<int>);
-  Expect.isTrue(g is F<int>);
-  Expect.isTrue(f is F<bool>);
-  Expect.isTrue(g is F<bool>);
-  Expect.equals("(dynamic) => dynamic", f.runtimeType.toString());
-  Expect.equals("(dynamic) => dynamic", g.runtimeType.toString());
-}