?> def hoge >> yield 1 >> end => nil >> ?> def bar >> yield 2 >> end => nil >> ?> total = 0 => 0 >> ?> hoge {|e| total+=e; bar{|e| total+=e}} => 3 >> total => 3>> def hoge >> p = Proc.new{p "world"} >> yield p >> end => nil >> hoge{|e| p "…