一段RUBY代码，既不报错，但是不输出结果，帮忙看下
class Song
def initialize(name,artist,duration)
@name = name
@artist = artist
@duration = duration
end

def to_s
"Song: #{@name}--#{@artist} (#{@duration})"
end
end

song = Song.new("zl","123",36);
song.inspect

song调用inspect不是得打印一些东西吗

[解决办法]
少了puts