parameters: (func_code)
return_statement: return func_code, first_line
docstring: Extract the first line information from the function code
          text if available.
docstring_summary: Extract the first line information from the function code
          text if available.
docstring_tokens: Extract the first line information from the function code text if available .
function: def extract_first_line(func_code):
      """ Extract the first line information from the function code
          text if available.
      """
      if func_code.startswith(FIRST_LINE_TEXT):
          func_code = func_code.split('\n')
          first_line = int(func_code[0][len(FIRST_LINE_TEXT):])
          func_code = '\n'.join(func_code[1:])
      else:
          first_line = -1
      return func_code, first_line
function_tokens: def extract_first_line ( func_code ) : if func_code . startswith ( FIRST_LINE_TEXT ) : func_code = func_code . split ( '\n' ) first_line = int ( func_code [ 0 ] [ len ( FIRST_LINE_TEXT ) : ] ) func_code = '\n' . join ( func_code [ 1 : ] ) else : first_line = - 1 return func_code , first_line