From: Robert Klemme <bob.news@...>
Date: 2004-02-28T07:29:46+09:00
Subject: UnboundMethod#hash apparently broken in 1.8.1


Hi all,

one can't use UnboundMethod as a hash key:

irb(main):001:0> class Foo; def bar;end; end
=> nil
irb(main):002:0> Foo.instance_method( :bar )
=> #<UnboundMethod: Foo#bar>
irb(main):003:0> a = Foo.instance_method( :bar )
=> #<UnboundMethod: Foo#bar>
irb(main):004:0> b = Foo.instance_method( :bar )
=> #<UnboundMethod: Foo#bar>
irb(main):005:0> a == b
=> true
irb(main):006:0> b == a
=> true
irb(main):007:0> a.hash == b.hash
=> false
irb(main):008:0> a.id
=> 135052720
irb(main):009:0> a.hash
=> 135052720
irb(main):010:0> b.id
=> 135044800
irb(main):011:0> b.hash
=> 135044800

UnboundMethod#hash is broken in 
$ ruby --version
ruby 1.8.1 (2003-12-25) [i386-cygwin]

Is that fixed in a later version?

Kind regards

    robert