Fix issue 24043: do not trust the pattern. Enable a 'hidden' test.

tests/language/string_split_test.dart

Index: tests/language/string_split_test.dart
diff --git a/tests/language/string_split_test.dart b/tests/language/string_split_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..657d74ed5902b0bed37c7c8f7704ff41e972b164
--- /dev/null
+++ b/tests/language/string_split_test.dart
@@ -0,0 +1,29 @@
+// Copyright (c) 2012, 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.
+// Issue 24043.
+
+import "package:expect/expect.dart";
+
+class EvilMatch implements Match {
+  int get start => 100000000;
+  int get end => 3;
+}
+
+class EvilIterator implements Iterator {
+  bool moveNext() => true;
+  EvilMatch get current => new EvilMatch();
+}
+
+class EvilIterable extends Iterable {
+  Iterator get iterator => new EvilIterator();
+}
+
+class EvilPattern {
+  Iterable allMatches(String s) => new EvilIterable();
+}
+
+void main() {
+  Expect.throws(() => "foo".split(new EvilPattern())[0].length,
+      (e) => e is RangeError);
+}