/**
   * Returns a new builder, expecting the specified number of entries to be added.
   *
   * <p>If {@code expectedSize} is exactly the number of entries added to the builder before {@link
   * Builder#build} is called, the builder is likely to perform better than an unsized {@link
   * #builder()} would have.
   *
   * <p>It is not specified if any performance benefits apply if {@code expectedSize} is close to,

var SkipAll error = fs.SkipAll

// WalkFunc is the type of the function called by [Walk] to visit each
// file or directory.
//
// The path argument contains the argument to Walk as a prefix.
// That is, if Walk is called with root argument "dir" and finds a file
// named "a" in that directory, the walk function will be called with
// argument "dir/a".
//

     * {@link #nextElements} if {@code next()} was called more recently then {@code previous},
     * {@link #previousElements} if the reverse is true, or -- overriding both of these -- {@code
     * null} if {@code remove()} or {@code add()} has been called more recently than either. We use
     * this to determine which stack to pop from on a call to {@code remove()} (or to pop from and
     * push to on a call to {@code set()}).
     */

//
// A benchmark ends when its Benchmark function returns or calls any of the methods
// FailNow, Fatal, Fatalf, SkipNow, Skip, or Skipf. Those methods must be called
// only from the goroutine running the Benchmark function.
// The other reporting methods, such as the variations of Log and Error,
// may be called simultaneously from multiple goroutines.
//

type node[K, V comparable] struct {
	isEntry bool
}

func (n *node[K, V]) entry() *entry[K, V] {
	if !n.isEntry {
		panic("called entry on non-entry node")
	}
	return (*entry[K, V])(unsafe.Pointer(n))
}

func (n *node[K, V]) indirect() *indirect[K, V] {
	if n.isEntry {
		panic("called indirect on entry node")
	}
	return (*indirect[K, V])(unsafe.Pointer(n))

   * doesn't satisfy the predicate, the multiset's {@code add()} and {@code addAll()} methods throw
   * an {@link IllegalArgumentException}. When methods such as {@code removeAll()} and {@code
   * clear()} are called on the filtered multiset, only elements that satisfy the filter will be
   * removed from the underlying multiset.
   *
   * <p>The returned multiset isn't threadsafe or serializable, even if {@code unfiltered} is.
   *

    throw new AssertionError("should never be called");
  }

  @Override
  public ImmutableCollection<V> values() {
    return (ImmutableCollection<V>) super.values();
  }

  @Override
  abstract ImmutableCollection<V> createValues();

  @Override
  final Iterator<V> valuesIterator() {
    throw new AssertionError("should never be called");
  }

  /**
   * {@inheritDoc}
   *

func (s1 *_TypeSet) subsetOf(s2 *_TypeSet) bool { return s1.terms.subsetOf(s2.terms) }

// TODO(gri) TypeSet.is and TypeSet.underIs should probably also go into termlist.go

// is calls f with the specific type terms of s and reports whether
// all calls to f returned true. If there are no specific terms, is
// returns the result of f(nil).
func (s *_TypeSet) is(f func(*term) bool) bool {
	if !s.hasTerms() {
		return f(nil)
	}

	io.Writer
}

func (responseWriterJustWriter) Header() Header  { panic("should not be called") }
func (responseWriterJustWriter) WriteHeader(int) { panic("should not be called") }

// delayedEOFReader never returns (n > 0, io.EOF), instead putting
// off the io.EOF until a subsequent Read call.
type delayedEOFReader struct {
	r io.Reader
}

}

// Event represents a config or registry event that results in a push.
type Event struct {
	// pushRequest PushRequest to use for the push.
	pushRequest *model.PushRequest

	// function to call once a push is finished. This must be called or future changes may be blocked.
	done func()
}

func newConnection(peerAddr string, stream DiscoveryStream) *Connection {
	return &Connection{