def FlagCxx14Features(filename, clean_lines, linenum, error):
line = clean_lines.elided[linenum]<EOL>include = Match(r'<STR_LIT>', line)<EOL>if include and include.group(<NUM_LIT:1>) in ('<STR_LIT>', '<STR_LIT>'):<EOL><INDENT>error(filename, linenum, '<STR_LIT>', <NUM_LIT:5>,<EOL>('<STR_LIT>') % include.group(<NUM_LIT:1>))<EOL><DEDENT>
Flag those C++14 features that we restrict.

    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.