code: def compute_diff_handle(filename, old_line, code):
          
          key = "{filename}:{old_line}:{code}".format(
              filename=filename, old_line=old_line, code=code
          )
          return BaseParser.compute_handle_from_key(key)
docs: Uses the absolute line and ignores the callable/character offsets.
          Used only in determining whether new issues are old issues.