* @param callback the LineProcessor to use to handle the lines
   * @return the output of processing the lines
   * @throws IOException if an I/O error occurs
   */
  @CanIgnoreReturnValue // some processors won't return a useful result
  @ParametricNullness
  public static <T extends @Nullable Object> T readLines(
      URL url, Charset charset, LineProcessor<T> callback) throws IOException {

    assertTrue(temp.delete());
  }

  public void testReadLines_withLineProcessor() throws IOException {
    File temp = createTempFile();
    LineProcessor<List<String>> collect =
        new LineProcessor<List<String>>() {
          final List<String> collector = new ArrayList<>();

          @Override
          public boolean processLine(String line) {
            collector.add(line);

  }

  public void testReadLines_withLineProcessor() throws IOException {
    String text = "a\nb\nc";

    // Test a LineProcessor that always returns false.
    Reader r = new StringReader(text);
    LineProcessor<Integer> alwaysFalse =
        new LineProcessor<Integer>() {
          int seen;

          @Override
          public boolean processLine(String line) {
            seen++;

  }

  public void testReadLines_withLineProcessor() throws IOException {
    String text = "a\nb\nc";

    // Test a LineProcessor that always returns false.
    Reader r = new StringReader(text);
    LineProcessor<Integer> alwaysFalse =
        new LineProcessor<Integer>() {
          int seen;

          @Override
          public boolean processLine(String line) {
            seen++;

  }

  public void testReadLines_withProcessor() throws IOException {
    TestCharSource lines = new TestCharSource(LINES);
    List<String> list =
        lines.readLines(
            new LineProcessor<List<String>>() {
              final List<String> list = new ArrayList<>();

              @Override
              public boolean processLine(String line) throws IOException {
                list.add(line);

      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  /**
   * Reads lines of text from this source, processing each line as it is read using the given {@link
   * LineProcessor processor}. Stops when all lines have been processed or the processor returns
   * {@code false} and returns the result produced by the processor.
   *

      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  /**
   * Reads lines of text from this source, processing each line as it is read using the given {@link
   * LineProcessor processor}. Stops when all lines have been processed or the processor returns
   * {@code false} and returns the result produced by the processor.
   *

    }
  }

  public void testReadLines_withProcessor() throws IOException {
    List<String> list =
        source.readLines(
            new LineProcessor<List<String>>() {
              final List<String> list = new ArrayList<>();

              @Override
              public boolean processLine(String line) throws IOException {
                list.add(line);

  }

  public void testReadLines_withLineProcessor() throws IOException {
    URL resource = getClass().getResource("testdata/alice_in_wonderland.txt");
    LineProcessor<List<String>> collectAndLowercaseAndTrim =
        new LineProcessor<List<String>>() {
          final List<String> collector = new ArrayList<>();

          @Override
          public boolean processLine(String line) {

    assertTrue(temp.delete());
  }

  public void testReadLines_withLineProcessor() throws IOException {
    File temp = createTempFile();
    LineProcessor<List<String>> collect =
        new LineProcessor<List<String>>() {
          final List<String> collector = new ArrayList<>();

          @Override
          public boolean processLine(String line) {
            collector.add(line);