From: Todd Benson <caduceass@...>
Date: 2012-10-24T00:42:50+09:00
Subject: Name/symbol/object type clash? What is happening here?

It's nonsense code, but I'm curious as to what is going on behind the scenes...

irb(main):001:0> S = Struct.new(:num)
=> S
irb(main):002:0> class S; def change_to n; @num = n; end; end
=> nil
irb(main):003:0> s = S.new(3)
#<struct S num=3>
irb(main):004:0> s.num = 4
=> 4
irb(main):005:0> s.num
=> 4
irb(main):006:0> s.change_to(5)
=> 5
irb(main):007:0> s.num
=> 4
irb(main):008:0> s.instance_variables
=> [:@num]
irb(main):009:0> s.instance_variable_set(:@num, 5)
=> 5
irb(main):010:0> s.num
=> 4

Same thing happens if I don't define class S, but just define a method
on the instance... def s.change_to n; @num = n; end