code: def hacking_no_cr(physical_line):
      r
      pos = physical_line.find('\r')
      if pos != -1 and pos == (len(physical_line) - 2):
          return (pos, "H903: Windows style line endings not allowed in code")
docs: r"""Check that we only use newlines not carriage returns.
  
      Okay: import os\nimport sys
      # pep8 doesn't yet replace \r in strings, will work on an
      # upstream fix
      H903 import os\r\nimport sys