require 'rubygems'
require 'mash'
m = Mash.new
m.dup
SystemStackError: stack level too deep
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:50:in `initialize'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:100:in `new'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:100:in `dup'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:215:in `stringify_keys'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:133:in `deep_update'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:50:in `initialize'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:100:in `new'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:100:in `dup'
from /Users/djsun/.gem/ruby/1.8/gems/mash-0.0.3/lib/mash.rb:215:in `stringify_keys'
# and so on ... ad infinitum
