--- a/langtools/src/share/classes/com/sun/tools/javac/code/Types.java	Thu Jul 24 10:35:38 2008 +0100
+++ b/langtools/src/share/classes/com/sun/tools/javac/code/Types.java	Thu Jul 24 11:12:41 2008 +0100
@@ -835,7 +835,7 @@
         };
 
     public boolean isCaptureOf(Type s, WildcardType t) {
-        if (s.tag != TYPEVAR || !(s instanceof CapturedType))
+        if (s.tag != TYPEVAR || !((TypeVar)s).isCaptured())
             return false;
         return isSameWildcard(t, ((CapturedType)s).wildcard);
     }