Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/closures_test.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 file.
+
+import 'expect.dart';
+
+class Base {
+  int constant1000() => 1000;
+}
+
+class Foo extends Base {
+  final int base;
+  Foo(this.base);
+
+  nestedAdderFunction(a, b, c, d, e) {
+    var result = a + b;
+    return () {
+      var result2 = c + d;
+      return () {
+        return base + result + result2 + e;
+      };
+    };
+  }
+
+  nestedAdderFunction2(a, b, c, d, e) {
+    var result = a + b;
+    return () {
+      var base = super.constant1000;
+      var result2 = c + d;
+      return () {
+        return base() + result + result2 + e;
+      };
+    };
+  }
+}
+
+nestedAdderFunction(a, b, c, d, e) {
+  var result = a + b;
+  return () {
+    var result2 = c + d;
+    return () {
+      return result + result2 + e;
+    };
+  };
+}
+
+main() {
+  Expect.isTrue(nestedAdderFunction(1, 2, 3, 4, 5)()() == 15);
+
+  var foo = new Foo(100);
+  Expect.isTrue(foo.nestedAdderFunction(1, 2, 3, 4, 5)()() == 115);
+  Expect.isTrue(foo.nestedAdderFunction2(1, 2, 3, 4, 5)()() == 1015);
+
+  var funs = [];
+  for (int i = 0; i < 3; i++) {
+    funs.add(() => i);
+  }
+  Expect.isTrue((funs[0]() + funs[1]() + funs[2]()) == 3);
+
+  var funs2 = [];
+  for (var i in [0, 1, 2]) {
+    funs2.add(() => i);
+  }
+  Expect.isTrue((funs2[0]() + funs2[1]() + funs2[2]()) == 3);
+}