Fix wrong limit on list index in double.parse.

tests/corelib/double_parse_test.dart

 // Copyright (c) 2014 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 "dart:math" show pow;
 import "package:expect/expect.dart";
 
 const whiteSpace = const [
   "",
   "\x09",
@@ skipping 252 matching lines @@
             "000000000000000000000000000000000000000000000000000"
             "000000000000000000000000000000000000000000000000000"
             "000000000000000000000000000000000000000000000000000"
             "000000000000000000000000000000000000000000000000000"
             "00022250738585072012", 2.2250738585072014e-308);
 
   testParse("0.49999999999999994", 0.49999999999999994);
   testParse("0.49999999999999997219", 0.49999999999999994);
   testParse("0.49999999999999999", 0.5);
 
+  // Edge cases of algorithm (e+-22/23).
+  testParse("1e22", 1e22);
+  testParse("1e23", 1e23);
+  testParse("1e-22", 1e-22);
+  testParse("1e-23", 1e-23);
+
   testParseWhitespace("1", 1.0);
   testParseWhitespace("1.0", 1.0);
   testParseWhitespace("1e1", 10.0);
   testParseWhitespace(".1e1", 1.0);
   testParseWhitespace("1.e1", 10.0);
   testParseWhitespace("1e+1", 10.0);
   testParseWhitespace("1e-1", 0.1);
 
   // Negative tests - things not to allow.
 
@@ skipping 30 matching lines @@
   testFail("INFINITY");
   testFail("1.#INF");
   testFail("inf");
   testFail("nan");
   testFail("NAN");
   testFail("1.#IND");
   testFail("indef");
   testFail("qnan");
   testFail("snan");
 }