code: def CheckEmptyBlockBody(filename, clean_lines, linenum, error):
    
  
    # Search for loop keywords at the beginning of the line.  Because only
    # whitespaces are allowed before the keywords, this will also ignore most
    # do-while-loops, since those lines should start with closing brace.
    #
    # We also check "if" blocks here, since an empty conditional block
    # is likely an error.
    line = clean_lines.elided[linenum]
    matched = Match(r'\s*(for|while|if)\s*\(', line)
    if matched:
      # Find the end of the conditional expression
      (end_line, end_linenum, end_pos) = CloseExpression(
          clean_lines, linenum, line.find('('))
  
      # Output warning if what follows the condition expression is a semicolon.
      # No warning for all other cases, including whitespace or newline, since we
      # have a separate check for semicolons preceded by whitespace.
      if end_pos >= 0 and Match(r';', end_line[end_pos:]):
        if matched.group(1) == 'if':
          error(filename, end_linenum, 'whitespace/empty_conditional_body', 5,
                'Empty conditional bodies should use {}')
        else:
          error(filename, end_linenum, 'whitespace/empty_loop_body', 5,
                'Empty loop bodies should use {} or continue')
docs: Look for empty loop/conditional body with only a single semicolon.
  
    Args:
      filename: The name of the current file.
      clean_lines: A CleansedLines instance containing the file.
      linenum: The number of the line to check.
      error: The function to call with any errors found.