From: Roger Pack <redmine@...>
Date: 2008-12-14T09:17:09+09:00
Subject: [ruby-core:20539] [Bug #869] hashed hashes don't work in 1.8.6

Issue #869 has been updated by Roger Pack.


Ahh--I see.  Different hashes with the same key/values don't necessarily have the same order, hence not necessarily the same #hash value, so the fact that it works in 1.8.7/1.9:

$ irb
>> RUBY_VERSION
=> "1.8.7"
>> a = {}
=> {}
>> a[{:a => 3, :b => 4}] = 5
=> 5
>>  a[{:a => 3, :b => 4}]
=> 5
>> exit

$ ruby_1_9_svn_installed/bin/irb
>>  a = {}
=> {}
>>  a[{:a => 3, :b => 4}] = 5
=> 5
>>  a[{:a => 3, :b => 4}]
=> 5

Is most likely a freak thing [except in 1.9, since order matters, it should hash the same if they're created the same way [?]].
http://blog.playlouder.com/2008/05/07/an-interesting-ruby-hash-semantics-gotcha/ Explains it better.
Thank you.
-=R
----------------------------------------
http://redmine.ruby-lang.org/issues/show/869

----------------------------------------
http://redmine.ruby-lang.org