diff -r d17f37522154 -r 7c537f4298fb src/share/classes/com/sun/tools/javac/parser/Scanner.java
--- a/src/share/classes/com/sun/tools/javac/parser/Scanner.java	Mon Jan 10 14:57:59 2011 -0800
+++ b/src/share/classes/com/sun/tools/javac/parser/Scanner.java	Mon Jan 10 15:08:31 2011 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -445,7 +445,7 @@
      */
     private void scanHexFractionAndSuffix(boolean seendigit) {
         this.radix = 16;
-        assert ch == '.';
+        Assert.check(ch == '.');
         putChar(ch);
         scanChar();
         skipIllegalUnderscores();