On the preexistence of Struct::Group and Struct::Passwd in Rails

require 'etc'

class Group
  def foo
    "hello"
  end
end

class WTF < Struct.new(:var)
  def foo
    puts Group.new.foo
  end
end

puts Group.new.foo
WTF.new.foo

### OUTPUT ###
# NoMethodError: undefined method ‘foo’ for #<struct Struct::Group name=nil, passwd=nil, gid=nil, mem=nil>
# 
# So... when you require 'etc' you get a Struct::Group and Struct::Passwd
#
# For Rails apps, the offender is in rails/railties/lib/rails/mongrel_server
# ... which requires 'etc'
# http://www.ruby-doc.org/stdlib/libdoc/etc/rdoc/classes/Etc.html
#
# Awesome!