Migrated test block 28 to Dart 2.0.

tests/corelib_2/string_replace_static_test.dart

+// Copyright (c) 2017, 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";
+
+void main() {
+  // Test object startIndex
+  "hello".replaceFirst("h", "X", new Object()); /*@compile-error=unspecified*/
+
+  // Test object startIndex
+  "hello".replaceFirstMapped(
+      "h", (_) => "X", new Object()); /*@compile-error=unspecified*/
+
+  "foo-bar".replaceFirstMapped("bar", (v) {
+    return 42;
+  }); /*@compile-error=unspecified*/
+
+  "hello".replaceRange(0, 0, 42); /*@compile-error=unspecified*/
+  "hello".replaceRange(0, 0, ["x"]); /*@compile-error=unspecified*/
+}
+
+// Fails to return a String on toString, throws if converted by "$naughty".
+class Naughty {
+  toString() => this; /*@compile-error=unspecified*/
+}