# File lib/puppet/network/rights.rb, line 216
216:         def restrict_environment(env)
217:             env = Puppet::Node::Environment.new(env)
218:             if @environment.include?(env)
219:                 raise ArgumentError, "'%s' is already in the '%s' ACL" % [env, name]
220:             end
221: 
222:             @environment << env
223:         end