module DSLKit::InstanceExec

def instance_exec(*args, &block)

the block.
executes _block_ in the context of this object while parsing *args into
This is a pure ruby implementation of Ruby 1.9's instance_exec method. It 
def instance_exec(*args, &block)
  instance = self
  id = instance_exec_fetch_symbol
  InstanceExec.module_eval do
    begin
      define_method id, block
      instance.__send__ id, *args
    ensure
      remove_method id if method_defined?(id)
    end
  end
ensure
  InstanceExec.pool << id
end