WTF::notFound looks too much like a local variable.

Source/wtf/HashTraits.h

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 189 matching lines @@
     struct HashTraits<std::pair<First, Second> > : public PairHashTraits<HashTraits<First>, HashTraits<Second> > { };
 
     template<typename KeyTypeArg, typename ValueTypeArg>
     struct KeyValuePair {
         typedef KeyTypeArg KeyType;
 
         KeyValuePair()
         {
         }
 
-        KeyValuePair(const KeyTypeArg& key, const ValueTypeArg& value)
-            : key(key)
-            , value(value)
+        KeyValuePair(const KeyTypeArg& _key, const ValueTypeArg& _value)
+            : key(_key)
+            , value(_value)
         {
         }
 
         template <typename OtherKeyType, typename OtherValueType>
         KeyValuePair(const KeyValuePair<OtherKeyType, OtherValueType>& other)
             : key(other.key)
             , value(other.value)
         {
         }
 
@@ skipping 29 matching lines @@
     };
 
 } // namespace WTF
 
 using WTF::HashTraits;
 using WTF::PairHashTraits;
 using WTF::NullableHashTraits;
 using WTF::SimpleClassHashTraits;
 
 #endif // WTF_HashTraits_h