Migrating another batch of tests to dart 2.

tests/language/closures_with_complex_params_test.dart

-// Copyright (c) 2011, 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";
-
-// Tests for parsing closures with complex parameter types.
-
-main() {
-  test1();
-  test2();
-  test3();
-}
-
-class Pair<A, B> {
-  final A fst;
-  final B snd;
-  Pair(A this.fst, B this.snd);
-}
-
-test1() {
-  // Closures with nested parameterized types.
-  var cdar1 = (Pair<int, Pair<int, int>> pr) => pr.snd.fst;
-  var cdar2 = (Pair<int, Pair<int, int>> pr) => pr.snd.fst;
-
-  var e = new Pair<int, Pair<int, int>>(100, new Pair<int, int>(200, 300));
-
-  Expect.equals(200, cdar1(e));
-  Expect.equals(200, cdar2(e));
-}
-
-test2() {
-  // Closures with nested parameterized types in optional position
-  var cdar1 = ([Pair<int, Pair<int, int>> pr = null]) => pr.snd.fst;
-  var cdar2 = ([Pair<int, Pair<int, int>> pr = null]) => pr.snd.fst;
-
-  var e = new Pair<int, Pair<int, int>>(100, new Pair<int, int>(200, 300));
-
-  Expect.equals(200, cdar1(e));
-  Expect.equals(200, cdar2(e));
-}
-
-test3() {
-  // Closures with nested parameterized types.
-  var f1 = (Pair<int, Pair<int, int>> pr) => pr.snd.fst + 1;
-  var f2 = (Pair<int, Pair<int, int>> pr) => pr.snd.fst + 2;
-
-  // Closures with function type with nested parameterized types.
-  var ap1 = (f(Pair<int, Pair<int, int>> pr1), Pair<int, Pair<int, int>> pr) =>
-      f(pr) * 10;
-  var ap2 = (f(Pair<int, Pair<int, int>> pr1), Pair<int, Pair<int, int>> pr) =>
-      f(pr) * 100;
-
-  var e = new Pair<int, Pair<int, int>>(100, new Pair<int, int>(200, 300));
-
-  Expect.equals(2010, ap1(f1, e));
-  Expect.equals(2020, ap1(f2, e));
-  Expect.equals(20100, ap2(f1, e));
-  Expect.equals(20200, ap2(f2, e));
-}