Merge kernel closure conversion into the Dart SDK

pkg/kernel/testcases/closures/type_variables.dart

+// Copyright (c) 2016, 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.md file.
+
+class C<T, S> {
+  foo(S s) => (T x) {
+    T y = x;
+    Object z = y;
+    C<T, S> self = this;
+    return z as T;
+  };
+
+  bar() {
+    C<T, S> self = this;
+  }
+
+  baz() {
+    return () => () => new C<T, S>();
+  }
+
+  factory C() {
+    local() {
+      C<T, S> self = new C<T, S>.internal();
+      return self;
+    }
+    return local();
+  }
+  C.internal();
+}
+
+main(arguments) {
+  print(new C<String, String>().foo(null)(arguments.first));
+  dynamic c = new C<int, int>().baz()()();
+  if (c is! C<int, int>) throw "$c fails type test 'is C<int, int>'";
+  if (c is C<String, String>) {
+    throw "$c passes type test 'is C<String, String>'";
+  }
+  print(c);
+}