Issue with compiler recognising a functional interface?

[David Holmes]

On 8/11/2012 8:42 PM, Paul Sandoz wrote:
> Hi,
>
> I am running into an issue with the compiler with latest code.

Is this the bug Mike referred to here:

http://mail.openjdk.java.net/pipermail/lambda-dev/2012-November/006485.html

David
-----

> See end of email for all relevant interfaces.
>
> The compiler fails for:
>
>    IntInfiniteIterator iterator = () ->  t;
>
>      [javac] /Users/sandoz/Projects/jdk8/lambda/jdk/src/share/classes/java/util/streams/primitives/Primitives.java:282: error: incompatible types: the target type must be a functional interface
>      [javac]             IntInfiniteIterator iterator = () ->  t;
>
> But works for:
>
>    InfiniteIterator<T>  iterator = () ->  t;
>
> I would of expected the former to work since there is just one non-default method.
>
> Paul.
>
> interface Iterator<E>  {
>      boolean hasNext();
>
>      E next();
>
>      default void remove() {
>          throw new UnsupportedOperationException("remove");
>      }
>
>      default void forEach(Block<? super E>  block) {
>          while (hasNext())
>              block.apply(next());
>      }
> }
>
> interface InfiniteIterator<T>  extends Iterator<T>  {
>      @Override
>      public default boolean hasNext() {
>          return true;
>      }
> }
>
> interface IntIterator extends Iterator<Integer>  {
>
>      // Iterator<Integer>
>
>      @Override
>      default Integer next() {
>          Logger.getLogger(getClass().getName()).log(Level.WARNING, "{0} using boxed int", getClass().getName());
>          return nextInt();
>      }
>
>
>      @Override
>      default void forEach(Block<? super Integer>  sink) {
>          if (sink instanceof IntBlock) {
>              forEach((IntBlock) sink);
>          }
>          else {
>              Iterator.super.forEach(sink);
>          }
>      }
>
>      //
>
>      int nextInt();
>
>      default void forEach(IntBlock sink) {
>          while (hasNext()) {
>              sink.applyInt(nextInt());
>          }
>      }
> }
>
> interface IntInfiniteIterator extends IntIterator {
>      @Override
>      default boolean hasNext() {
>          return true;
>      }
> }
>
>