diff -r 6e9a43815df7 -r f7e64b33d5a4 src/share/classes/com/sun/tools/javac/comp/Check.java
--- a/src/share/classes/com/sun/tools/javac/comp/Check.java	Fri May 30 10:42:43 2008 +0100
+++ b/src/share/classes/com/sun/tools/javac/comp/Check.java	Fri May 30 11:08:40 2008 +0100
@@ -1486,6 +1486,8 @@
 
     private void checkNonCyclic1(DiagnosticPosition pos, Type t, Set<TypeVar> seen) {
         final TypeVar tv;
+        if  (t.tag == TYPEVAR && (t.tsym.flags() & UNATTRIBUTED) != 0)
+            return;
         if (seen.contains(t)) {
             tv = (TypeVar)t;
             tv.bound = new ErrorType();