def make_tweet_fn(text, time, lat, lon):
    """An alternate implementation of make_tweet: a tweet is a function.

    >>> t = make_tweet_fn("just ate lunch", datetime(2012, 9, 24, 13), 38, 74)
    >>> tweet_text_fn(t)
    'just ate lunch'
    >>> tweet_time_fn(t)
    datetime.datetime(2012, 9, 24, 13, 0)
    >>> latitude(tweet_location_fn(t))
    38
    """
    def tweet(string):
        if string == 'text':
            return text
        elif string == 'time':
            return time
        elif string == 'lat':
            return lat
        elif string == 'lon':
            return lon
        
    return tweet
    
    # Please don't call make_tweet in your solution