mri1.9.2

Charles-Remess-MacBook-Pro:~ cremes$ ruby -v 
ruby 1.9.2p136 (2010-12-25 revision 30365) [x86_64-darwin10.6.0]
Charles-Remess-MacBook-Pro:~ cremes$ ruby -S gem install classy_struct
Successfully installed classy_struct-0.3.2
1 gem installed
Installing ri documentation for classy_struct-0.3.2...
Installing RDoc documentation for classy_struct-0.3.2...
Charles-Remess-MacBook-Pro:~ cremes$ irb
ruby-1.9.2-p136 :001 > require 'classy_struct'
 => true 
ruby-1.9.2-p136 :002 > A = ClassyStruct.new
 => A 
ruby-1.9.2-p136 :003 > a = A.new :a => 'b'
 => {:a=>"b"} 
ruby-1.9.2-p136 :004 > class B < A
ruby-1.9.2-p136 :005?>   end
 => nil 
ruby-1.9.2-p136 :006 > b = B.new :b => 3
NoMethodError: undefined method `<<' for nil:NilClass
	from /Users/cremes/.rvm/gems/ruby-1.9.2-p136/gems/classy_struct-0.3.2/lib/classy_struct.rb:82:in `method_missing'
	from /Users/cremes/.rvm/gems/ruby-1.9.2-p136/gems/classy_struct-0.3.2/lib/classy_struct.rb:21:in `block in initialize'
	from /Users/cremes/.rvm/gems/ruby-1.9.2-p136/gems/classy_struct-0.3.2/lib/classy_struct.rb:12:in `each_pair'
	from /Users/cremes/.rvm/gems/ruby-1.9.2-p136/gems/classy_struct-0.3.2/lib/classy_struct.rb:12:in `initialize'
	from (irb):6:in `new'
	from (irb):6
	from /Users/cremes/.rvm/rubies/ruby-1.9.2-p136/bin/irb:16:in `<main>'

rbx1.2.4

Charles-Remess-MacBook-Pro:~ cremes$ ruby -S gem install classy_struct
Fetching: classy_struct-0.3.2.gem (100%)
Successfully installed classy_struct-0.3.2
1 gem installed
Installing ri documentation for classy_struct-0.3.2...
Installing RDoc documentation for classy_struct-0.3.2...
Charles-Remess-MacBook-Pro:~ cremes$ irb
irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'classy_struct'
=> true
irb(main):003:0> A = ClassyStruct.new
=> A
irb(main):004:0> a = A.new :woo => 'woot'
=> {:woo=>"woot"}
irb(main):005:0> class B < A
irb(main):006:1> end
=> nil
irb(main):007:0> b = B.new :really => 'yes'
NoMethodError: undefined method `<<' on nil:NilClass.
   from Kernel(NilClass)#<< (method_missing) at kernel/delta/kernel.rb:79
   from ClassyStruct::ClassyStructClass(B)#really= (method_missing) at /Volumes/spiff/cremes/dev/ruby/rubinius.master/gems/1.8/gems/classy_struct-0.3.2/lib/classy_struct.rb:82
   from { } in ClassyStruct::ClassyStructClass(B)#initialize at /Volumes/spiff/cremes/dev/ruby/rubinius.master/gems/1.8/gems/classy_struct-0.3.2/lib/classy_struct.rb:21
   from { } in Hash#each_pair at kernel/common/hash.rb:348
   from Hash#each_entry at kernel/common/hash.rb:309
   from Hash#each_pair at kernel/common/hash.rb:347
   from ClassyStruct::ClassyStructClass(B)#initialize at /Volumes/spiff/cremes/dev/ruby/rubinius.master/gems/1.8/gems/classy_struct-0.3.2/lib/classy_struct.rb:12
   from { } in Object#irb_binding at (irb):7
   from Rubinius::BlockEnvironment#call_on_instance at kernel/common/block_environment.rb:72