* <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated. Instead,
   * use the {@code HashSet} constructor directly, taking advantage of <a
   * href="https://docs.oracle.com/javase/tutorial/java/generics/genTypeInference.html#type-inference-instantiation">"diamond"
   * syntax</a>.
   */
  @SuppressWarnings("NonApiType") // acts as a direct substitute for a constructor call

      Class<X> exceptionType, ClosingFunction<? super X, ? extends V> fallback, Executor executor) {
    return catchingMoreGeneric(exceptionType, fallback, executor);
  }

  // Avoids generic type capture inconsistency problems where |? extends V| is incompatible with V.
  private <X extends Throwable, W extends V> ClosingFuture<V> catchingMoreGeneric(

				"application/mikey",
				"application/moss-keys",
				"application/moss-signature",
				"application/mosskey-data",
				"application/mosskey-request",
				"application/mp4",
				"application/mpeg4-generic",
				"application/mpeg4-iod",
				"application/mpeg4-iod-xmt",
				"application/msword",
				"application/msword2",
				"application/msword5",
				"application/mxf",
				"application/nasdata",

   * instance, this method returns {@code CacheBuilder<K1, V1>}. From this point on, either the
   * original reference or the returned reference may be used to complete configuration and build
   * the cache, but only the "generic" one is type-safe. That is, it will properly prevent you from
   * building caches whose key or value types are incompatible with the types accepted by the

   * instance, this method returns {@code CacheBuilder<K1, V1>}. From this point on, either the
   * original reference or the returned reference may be used to complete configuration and build
   * the cache, but only the "generic" one is type-safe. That is, it will properly prevent you from
   * building caches whose key or value types are incompatible with the types accepted by the

        return new TypeToken<SubBar<T>>() {};
      }
    }

    Field delegateField = SubBar.class.getDeclaredField("delegate");
    // barType is Bar<T>, a ParameterizedType with no generic arguments specified
    TypeToken<?> barType = TypeToken.of(delegateField.getGenericType());
    assertThat(barType.getSubtype(SubBar.class)).isEqualTo(new SubBar<Void>().fieldTypeAsSubBar());
  }

    }

    /**
     * Returns {@code this} up-casted to the specific {@link Segment} implementation type {@code S}.
     *
     * <p>This method exists so that the {@link Segment} code can be generic in terms of {@code S},
     * the type of the concrete implementation.
     */
    abstract S self();

    /** Drains the reference queues used by this segment, if any. */
    @GuardedBy("this")