Change Expect.identical(NaN, x) to not assume NaNs are identical.

tests/corelib/num_parse_test.dart

 // Copyright (c) 2013 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";
 
 const whiteSpace = const [
   "",
   "\x09",
   "\x0a",
@@ skipping 16 matching lines @@
   "\u2009",
   "\u200a",
   "\u2028",
   "\u2029",
   "\u202f",
   "\u205f",
   "\u3000",
   "\uFEFF"
 ];
 
+void expectNumEquals(num expect, num actual, String message) {
+  if (expect is double && expect.isNaN) {
+    Expect.isTrue(actual is double && actual.isNaN, "isNaN: $message");
+  } else {
+    Expect.identical(expect, actual, message);
+  }
+}
+
 void testParse(String source, num result) {
   for (String ws1 in whiteSpace) {
     for (String ws2 in whiteSpace) {
       String padded = "$ws1$source$ws2";
       // Use Expect.identical because it also handles NaN and 0.0/-0.0.
       // Except on dart2js: http://dartbug.com/11551
-      Expect.identical(result, num.parse(padded), "parse '$padded'");
+      expectNumEquals(result, num.parse(padded), "parse '$padded'");
       padded = "$ws1$ws2$source";
-      Expect.identical(result, num.parse(padded), "parse '$padded'");
+      expectNumEquals(result, num.parse(padded), "parse '$padded'");
       padded = "$source$ws1$ws2";
-      Expect.identical(result, num.parse(padded), "parse '$padded'");
+      expectNumEquals(result, num.parse(padded), "parse '$padded'");
     }
   }
 }
 
 void testInt(int value) {
   testParse("$value", value);
   testParse("+$value", value);
   testParse("-$value", -value);
   var hex = "0x${value.toRadixString(16)}";
   var lchex = hex.toLowerCase();
@@ skipping 128 matching lines @@
   testFail("-e-1");
   // Incorrect ways to write NaN/Infinity.
   testFail("infinity");
   testFail("INFINITY");
   testFail("inf");
   testFail("nan");
   testFail("NAN");
   testFail("qnan");
   testFail("snan");
 }