public <T extends @Nullable Object> T[] toArray(T[] array) {
    return snapshot().toArray(array);
  }

  /*
   * We'd love to use 'new ArrayList(this)' or 'list.addAll(this)', but
   * either of these would recurse back to us again!
   */
  private List<E> snapshot() {
    List<E> list = newArrayListWithExpectedSize(size());
    for (Multiset.Entry<E> entry : entrySet()) {
      E element = entry.getElement();

        throws IOException {
      Set<File> currentPath = new HashSet<>();
      currentPath.add(directory.getCanonicalFile());
      scanDirectory(directory, "", currentPath, builder);
    }

    /**
     * Recursively scan the given directory, adding resources for each file encountered. Symlinks
     * which have already been traversed in the current tree path will be skipped to eliminate
     * cycles; otherwise symlinks are traversed.

        return minChildIndex;
      }
      return crossOverUp(index, x);
    }

    /**
     * Fills the hole at {@code index} by moving in the least of its grandchildren to this position,
     * then recursively filling the new hole created.
     *
     * @return the position of the new hole (where the lowest grandchild moved from, that had no
     *     grandchild to replace it)
     */
    int fillHoleAt(int index) {

                                                 TF_Buffer* value_buf,
                                                 TF_Status* status);

// Delete configuration key-value. If `key` is a directory, recursively clean up
// all key-values under the path specified by `key`.
TF_CAPI_EXPORT extern void TFE_DeleteConfigKeyValue(TFE_Context* ctx,
                                                    const char* key,

109B8..109BB  ; disallowed                             # NA   <reserved-109B8>..<reserved-109BB>
109BC..109BD  ; valid                  ;      ; NV8    # 8.0  MEROITIC CURSIVE FRACTION ELEVEN TWELFTHS..MEROITIC CURSIVE FRACTION ONE HALF
109BE..109BF  ; valid                                  # 6.1  MEROITIC CURSIVE LOGOGRAM RMT..MEROITIC CURSIVE LOGOGRAM IMN

         */

        if( log.level >= 3 )
            log.println( "delete: " + fileName );

        if(( attributes & ATTR_DIRECTORY ) != 0 ) {

            /* Recursively delete directory contents
             */

            try {
                SmbFile[] l = listFiles( "*", ATTR_DIRECTORY | ATTR_HIDDEN | ATTR_SYSTEM, null, null );

	Close()  // illegal: signatures of Reader.Close and Close are different
}
</pre>

<p>
An interface type <code>T</code> may not embed itself
or any interface type that embeds <code>T</code>, recursively.
</p>

<pre>
// illegal: Bad cannot embed itself
type Bad interface {
	Bad
}

// illegal: Bad1 cannot embed itself using Bad2
type Bad1 interface {
	Bad2
}