Problem with extension methods

[Howard Lovatt]

Hi,

I am trying out extension methods:

public interface NewList<T> extends List<T> {
  extension void sort( final Comparator<? super T> c ) default Collections.sort;
}

public class MinimalIntegerList extends AbstractList<Integer>
implements NewList<Integer> {
  [snip] // no sort method
}

21:    final MinimalIntegerList il = new MinimalIntegerList();
22:    out.println( il );
23:    il.sort( #( i1, i2 ) { i1 - i2 } );
24:    out.println( il );

I get:

[10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
Exception in thread "main" java.lang.AbstractMethodError:
lambdas.MinimalIntegerList.sort(Ljava/util/Comparator;)V
	at lambdas.Main.extensionMethods(Main.java:23)
	at lambdas.Main.main(Main.java:16)

Any idea what's wrong?

-- 
  -- Howard.