Ruby on Rails

In this lesson, I am learning optional block.
class Library
attr_accessor :games

def initialize(games)
@games = games
end

def list
games.each do |game|
if block_given?
puts yield game
else
puts game.name

end
end
end

When I summit code, it shows syntax error, unexpected end_of_file. :(
I can't solve this problem, please help!!!!!!

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