diff -r f4fdd53f8b3e -r 7ac9242d2ca6 src/share/classes/com/sun/tools/javac/code/Types.java
--- a/src/share/classes/com/sun/tools/javac/code/Types.java	Thu Feb 21 15:23:48 2013 +0000
+++ b/src/share/classes/com/sun/tools/javac/code/Types.java	Thu Feb 21 15:25:03 2013 +0000
@@ -580,7 +580,17 @@
             for (Type t : formalInterface.getTypeArguments()) {
                 if (actualTypeargs.head.hasTag(WILDCARD)) {
                     WildcardType wt = (WildcardType)actualTypeargs.head;
-                    typeargs.append(wt.type);
+                    Type bound;
+                    switch (wt.kind) {
+                        case UNBOUND:
+                            //use declared bound if it doesn't depend on formal type-args
+                            bound = wt.bound.bound.containsAny(formalInterface.getTypeArguments()) ?
+                                    syms.objectType : wt.bound.bound;
+                            break;
+                        default:
+                            bound = wt.type;
+                    }
+                    typeargs.append(bound);
                 } else {
                     typeargs.append(actualTypeargs.head);
                 }