From: "nobu (Nobuyoshi Nakada)" <nobu@...>
Date: 2014-01-08T15:38:57+09:00
Subject: [ruby-core:59639] [ruby-trunk - Bug #9381][Assigned] 2.1.0	Regression. Hash lookup with #hash and #eql?


Issue #9381 has been updated by nobu (Nobuyoshi Nakada).

Description updated
Status changed from Open to Assigned
Assignee set to nobu (Nobuyoshi Nakada)
Target version set to current: 2.2.0
Backport changed from 1.9.3: UNKNOWN, 2.0.0: UNKNOWN, 2.1: UNKNOWN to 1.9.3: DONTNEED, 2.0.0: DONTNEED, 2.1: REQUIRED


----------------------------------------
Bug #9381: 2.1.0 Regression. Hash lookup with #hash and #eql?
https://bugs.ruby-lang.org/issues/9381#change-44167

Author: nick78 (Nick S)
Status: Assigned
Priority: Normal
Assignee: nobu (Nobuyoshi Nakada)
Category: core
Target version: current: 2.2.0
ruby -v: ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-linux]
Backport: 1.9.3: DONTNEED, 2.0.0: DONTNEED, 2.1: REQUIRED


=begin
Ruby 2.1.0 won't fetch objects when the lookup key overrides (({#hash})) and (({#eql?})).
This is a regression as it works as expected in ruby 1.8, 1.9 and 2.0.

 class Wrapper
   def initialize(obj)
     @obj = obj
   end

   def method_missing(symbol, *args, &block)
     @obj.__send__(symbol, *args, &block)
   end

   def hash
     @obj.hash
   end

   def eql?(other)
     @obj.eql?(other)
   end
 end

 hash = { 5 => "LOOKUP SUCCEEDED" }

 # Prints "LOOKUP SUCCEEDED" on RUBY < 2.1.0. Fails on RUBY 2.1.0.
 p hash[Wrapper.new(5)]
=end



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