old_contents: # enable: W9401,W9402
  
  #A comment does not begin with a whitespace.
  
  a = 1 + 2  #  A comment begins with two whitespace.
  
  # a comment begins with a lowercase letter.
  
  # Good comment examples.
  
  # A sentence that spans multiple lines
  # doesn't need to have capitalization on second line.
  
  # Here's some code samples:
  #  x = x + 1
  
  # Make sure no error occur when checking an empty comment
  #
  
  # '\r\n\t' a comment can start with a new lines characters.
  
  var = 1 + 2  # \r\n same for inline comments.
  
new_contents: # enable: W9401,W9402
  
  #A comment does not begin with a whitespace.
  
  a = 1 + 2  #  A comment begins with two whitespace.
  
  # a comment begins with a lowercase letter.
  
  # Good comment examples.
  
  # A sentence that spans multiple lines
  # doesn't need to have capitalization on second line.
  
  # Here's some code samples:
  #  x = x + 1
  
  # Make sure no error occur when checking an empty comment
  #
  
  # '\r\n\t' a comment can start with a new lines characters.
  
  var = 1 + 2  # \r\n same for inline comments.
  
  # `literal` is fine at the start.
  
subject: Add example with back ticks.