From: "tadf (tadayoshi funaba)" <redmine@...>
Date: 2012-06-03T19:29:41+09:00
Subject: [ruby-core:45403] [ruby-trunk - Bug #6538] Mutability of Rational and Complex


Issue #6538 has been updated by tadf (tadayoshi funaba).

Assignee set to tadf (tadayoshi funaba)

class IM
  def initialize(s) @s = s end
  attr :s
end

i = IM.new(1)
i.s #=> 1
i.instance_eval{@s = 100}
i.s #=> 100

is this a mutable?

----------------------------------------
Bug #6538: Mutability of Rational and Complex
https://bugs.ruby-lang.org/issues/6538#change-26990

Author: marcandre (Marc-Andre Lafortune)
Status: Open
Priority: Low
Assignee: tadf (tadayoshi funaba)
Category: core
Target version: 
ruby -v: r35875


I hesitated to report this, but there is a "hole" in the immutability of Rational & Complex:

    r = Rational(0) # Rationals are immutable
    r.freeze        # but let's be certain and freeze it!
    magic_trick(r)  # r is now changed:
    r               # => (1/42)

The same thing occurs with Complex. I've left out the definition of `magic_trick` for anyone who wants to try and figure it out, but it's here: http://pastie.org/4016117

Is this worth fixing?



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