requireNonNull(seq); // safe as long as we call this only after checkOpen
    return seq.length() - pos;
  }

  /*
   * To avoid the need to call requireNonNull so much, we could consider more clever approaches,
   * such as:
   *
   * - Make checkOpen return the non-null `seq`. Then callers can assign that to a local variable or
   *   even back to `this.seq`. However, that may suggest that we're defending against concurrent

    }

    /**
     * JDBCドライバを登録します。
     *
     * @param driver
     *            登録するJDBCドライバ。{@literal null}であってはいけません
     */
    public static void registerDriver(final Driver driver) {
        assertArgumentNotNull("driver", driver);

        try {
            DriverManager.registerDriver(driver);
        } catch (final SQLException e) {
            throw new SQLRuntimeException(e);
        }

  }

  @GwtIncompatible // GWT reflection includes less data
  public void testLenientFormat_badArgumentToString() {
    assertThat(Strings.lenientFormat("boiler %s plate", new ThrowsOnToString()))
        .matches(
            // J2kt nested class name does not use "$"
            "boiler <com\\.google\\.common\\.base\\.StringsTest[.$]ThrowsOnToString@[0-9a-f]+ "
                + "threw java\\.lang\\.UnsupportedOperationException> plate");
  }

  }

  @GwtIncompatible // GWT reflection includes less data
  public void testLenientFormat_badArgumentToString() {
    assertThat(Strings.lenientFormat("boiler %s plate", new ThrowsOnToString()))
        .matches(
            // J2kt nested class name does not use "$"
            "boiler <com\\.google\\.common\\.base\\.StringsTest[.$]ThrowsOnToString@[0-9a-f]+ "
                + "threw java\\.lang\\.UnsupportedOperationException> plate");
  }

        do {
            if ( ( readn(this.in, this.sbuf, 0, 4) ) < 4 ) {
                return null;
            }
        }
        while ( this.sbuf[ 0 ] == (byte) 0x85 ); /* Dodge NetBIOS keep-alive */
        /* read smb header */
        if ( ( readn(this.in, this.sbuf, 4, SmbConstants.SMB1_HEADER_LENGTH) ) < SmbConstants.SMB1_HEADER_LENGTH ) {
            return null;
        }

      collection = ImmutableList.copyOf(futures);
    }
    return (ListenableFuture<? extends T>[]) collection.toArray(new ListenableFuture<?>[0]);
  }

  // This can't be a TrustedFuture, because TrustedFuture has clever optimizations that
  // mean cancel won't be called if this Future is passed into setFuture, and then
  // cancelled.
  private static final class InCompletionOrderFuture<T extends @Nullable Object>

            this.treeHandle.ensureDFSResolved();
            if ( this.transportContext.getConfig().isStrictResourceLifecycle() ) {
                // one extra share to keep the tree alive
                return this.treeHandle.acquire();
            }
            return this.treeHandle;
        }
        return this.treeHandle.acquire();
    }


    /**
     * @param context