Wildcard capture reported incompatible with wildcard use

FULL PRODUCT VERSION :
java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b12)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b12, mixed mode, sharing)

java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux [machine name] 2.6.8.1-12mdk #1 Fri Oct 1 12:53:41 CEST 2004 i686 AMD Athlon(tm) XP 2400+ unknown GNU/Linux


A DESCRIPTION OF THE PROBLEM :
The error seems to say that wildcard use is incompatible with an identically-declared method result.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No error

ACTUAL -
Final1.java:5: incompatible types
found : Agg<J,K,capture of ? extends Pair<J,K>>
required: Agg<J,K,? extends Pair<J,K>>
                Agg<J,K, ? extends Pair<J,K>> aggs = haver.getAgg();
                                                                 ^
1 error


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Collection;

abstract class Test<J, K> {
void have(Haver<J,K> haver) {
Agg<J,K, ? extends Pair<J,K>> aggs = haver.getAgg();
Collection<? extends Pair<J,K>> pairs = aggs.getPairs();
for(final Pair<J,K> pair : pairs)
System.out.println(pair);
}
}

interface Pair<A,B> {
A getA(); B getB();
}

interface Agg<C,D, E extends Pair<C,D>> {
Collection<E> getPairs();
}

interface Haver<F,G> {
Agg<F,G, ? extends Pair<F,G>> getAgg();
}

---------- END SOURCE ----------

Note that code is processed without error on a colleague's Eclipse, Nov. 10 integrated build Windows 2000
###@###.### 2004-12-13 23:18:01 GMT