From: Yukihiro Matsumoto <matz@...>
Date: 2010-02-16T23:33:52+09:00
Subject: [ruby-core:28190] Re: [Bug #1535] Hash#merge! Inside Iterator Can Cause RuntimeError

Hi,

In message "Re: [ruby-core:28189] [Bug #1535] Hash#merge! Inside Iterator Can Cause RuntimeError"
    on Tue, 16 Feb 2010 22:13:51 +0900, Yusuke Endoh <redmine@ruby-lang.org> writes:

|So, I propose to permit only updating value of existing key,
|and to always prohibit adding a new key:
|
|  hash = { 1=>2, 3=>4, 5=>6 }
|  hash.each {|k, v| hash[k] = func(v) }  #=> OK
|  hash.each {|k, v| hash[k.to_s] = v }   #=> always exception
|
|This does not cause compatibility problem because this just 
|raises exception that has already been occurred indeterminately.
|I'll commit the following patch to trunk unless anyone says an
|objection.

I think it's a good idea.  Go ahead.

							matz.