Matz himself weighs in here: https://www.ruby-forum.com/topic/155673#685906

I read from somewhere that now Ruby can't dynamically create local variable. Is it true or just a bug? The local variables are created in compile time, so that local variables that are defined in eval() cannot be accessed outside of eval. In 1.8, irb and tryruby does line by line compilation so that local variables are spilled from eval(), but in 1.9, it's strictly prohibited even under line-by-line compilation.

可以用 Struct 和 OpenStruct

array = ["a","b","c"]
array.each do |value|
  instance_variable_set("@#{value}", "what you want")
end

没看元编程的书？

#4 楼 @mystery 还没有来得及看这本书。