From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2012-06-03T23:19:31+09:00
Subject: [ruby-core:45404] [ruby-trunk - Bug #6538] Mutability of Rational and Complex


Issue #6538 has been updated by nobu (Nobuyoshi Nakada).


Marshal compatibilities for Complex and Rational are already broken,
since the time they were built in.

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Bug #6538: Mutability of Rational and Complex
https://bugs.ruby-lang.org/issues/6538#change-26993

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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