if err != nil {
		t.Fatal(err)
	}
	// Check the line numbers. Each line is an action containing a template, followed by text.
	// That's two nodes per line.
	nodes := tree.Root.Nodes
	for i := 0; i < len(nodes); i += 2 {
		line := 1 + i/2
		// Action first.
		action := nodes[i].(*ActionNode)
		if action.Line != line {
			t.Errorf("line %d: action is line %d", line, action.Line)
		}
		pipe := action.Pipe

		{"//line foo:x\n", "invalid line number: x", filename, 1, 12},
		{"//line foo:0\n", "invalid line number: 0", filename, 1, 12},
		{"//line foo:1 \n", "invalid line number: 1 ", filename, 1, 12},
		{"//line foo:-12\n", "invalid line number: -12", filename, 1, 12},
		{"//line C:foo:0\n", "invalid line number: 0", filename, 1, 14},

			stack = append(stack, callID{
				file: callees[j].File,
				line: callees[j].Line,
			})
		}
		file.lines[f.Line] = append(file.lines[f.Line], sourceInst{addr, stack})

		// Remember the first function name encountered per source line
		// and assume that that line belongs to that function.
		if _, ok := file.funcName[f.Line]; !ok {
			file.funcName[f.Line] = f.Func
		}
	}
}

	ended := false       // found non-blank, non-// line, so stopped accepting // +build lines
	inSlashStar := false // in /* */ comment

Lines:
	for len(p) > 0 {
		line := p
		if i := bytes.IndexByte(line, '\n'); i >= 0 {
			line, p = line[:i], p[i+1:]
		} else {
			p = p[len(p):]
		}
		line = bytes.TrimSpace(line)
		if len(line) == 0 && !ended { // Blank line
			// Remember position of most recent blank line.

Ian Lance Taylor <******@****.***> 1607728543 -0800

            try (Stream<String> lines = Files.lines(uniqueLockFile, CHARSET)) {
                lines.filter(empty.or(comment).negate())
                    .filter(line -> {
                        if (line.startsWith(EMPTY_RESOLUTIONS_ENTRY)) {
                            // This is a perf hack for handling the last line in the file in a special way
                            collectEmptyLockIds(line, emptyLockIds);

                           int a_write_fd)
      : file_(a_file), line_(a_line), index_(an_index),
        write_fd_(a_write_fd) {}

  ~InternalRunDeathTestFlag() {
    if (write_fd_ >= 0)
      posix::Close(write_fd_);
  }

  const std::string& file() const { return file_; }
  int line() const { return line_; }
  int index() const { return index_; }
  int write_fd() const { return write_fd_; }

Ian Lance Taylor <******@****.***> 1677882584 -0800

Ian Lance Taylor <******@****.***> 1607728543 -0800

		"",
	}

	if len(lines) > len(patterns) {
		t.Errorf("Expecting %d lines of output, but got %d", len(patterns), len(lines))

		for i := len(patterns); i < len(lines); i++ {
			t.Errorf("  Extra line of output: %s", lines[i])
		}
	}

	for i, pat := range patterns {
		t.Run(strconv.Itoa(i), func(t *testing.T) {
			match, _ := regexp.MatchString(pat, lines[i])
			if !match {