* {@link Optional#absent} is returned.
   *
   * <p><b>Comparison to {@code java.util.Optional}:</b> this method is similar to Java 8's {@code
   * Optional.map}, except when {@code function} returns {@code null}. In this case this method
   * throws an exception, whereas the Java 8+ method returns {@code Optional.absent()}.
   *
   * @throws NullPointerException if the function returns {@code null}
   * @since 12.0
   */

	s.scan()
	for ; len(s.token) >= min; s.scan() {
		end = s.end
	}
	return end
}

// Parse parses the given BCP 47 string and returns a valid Tag. If parsing
// failed it returns an error and any part of the tag that could be parsed.
// If parsing succeeded but an unknown value was found, it returns
// ValueError. The Tag returned in this case is just stripped of the unknown

  /** Returns {@code true} if this range has an upper endpoint. */
  public boolean hasUpperBound() {
    return upperBound != Cut.aboveAll();
  }

  /**
   * Returns the upper endpoint of this range.
   *
   * @throws IllegalStateException if this range is unbounded above (that is, {@link
   *     #hasUpperBound()} returns {@code false})
   */
  public C upperEndpoint() {
    return upperBound.endpoint();
  }

std::string GetDeviceAliasForHostOfLogicalCore(int core_index);

// Returns true if cluster contains model parallelism based on
// `num_cores_per_replica_attribute`. Otherwise returns false.
bool HasModelParallelism(mlir::tf_device::ClusterOp cluster);

// Returns true if the devices list contain any TPU devices
bool HasTPUDevice(const mlir::TF::RuntimeDevices& devices);

// Returns the host device used for outside compilation in generic pipeline.

    implements Serializable {

  /**
   * Returns an empty multimap.
   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   */
  public static <K, V> ImmutableMultimap<K, V> of() {
    return ImmutableListMultimap.of();
  }

  /** Returns an immutable multimap containing a single entry. */
  public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1) {
    return ImmutableListMultimap.of(k1, v1);
  }

There is also a set of binary comparison operators defined as
functions:

	eq
		Returns the boolean truth of arg1 == arg2
	ne
		Returns the boolean truth of arg1 != arg2
	lt
		Returns the boolean truth of arg1 < arg2
	le
		Returns the boolean truth of arg1 <= arg2
	gt
		Returns the boolean truth of arg1 > arg2
	ge
		Returns the boolean truth of arg1 >= arg2

	case int64:
		return types.Int(v), IntType, nil
	case string:
		return types.String(v), StringType, nil
	case uint64:
		return types.Uint(v), UintType, nil
	case time.Duration:
		return types.Duration{Duration: v}, DurationType, nil
	case time.Time:
		return types.Timestamp{Time: v}, TimestampType, nil
	case types.Null:
		return v, NullType, nil
	case *ListValue:
		return v, ListType, nil
	case *MapValue:

	if q.d.Dec != nil {
		return q.d.AsCanonicalBytes(out)
	}
	return q.i.AsCanonicalBytes(out)
}

// IsZero returns true if the quantity is equal to zero.
func (q *Quantity) IsZero() bool {
	if q.d.Dec != nil {
		return q.d.Dec.Sign() == 0
	}
	return q.i.value == 0
}

// Sign returns 0 if the quantity is zero, -1 if the quantity is less than zero, or 1 if the

  }

  /** Returns true if the element is package-private. */
  public final boolean isPackagePrivate() {
    return !isPrivate() && !isPublic() && !isProtected();
  }

  /** Returns true if the element is private. */
  public final boolean isPrivate() {
    return Modifier.isPrivate(getModifiers());
  }

  /** Returns true if the element is static. */
  public final boolean isStatic() {

  }

  /** Returns a hash function implementing the SHA-512 algorithm (512 hash bits). */
  public static HashFunction sha512() {
    return Sha512Holder.SHA_512;
  }

  private static class Sha512Holder {
    static final HashFunction SHA_512 =
        new MessageDigestHashFunction("SHA-512", "Hashing.sha512()");
  }

  /**