span> <span class='id identifier rubyid_block_given?'>block_given?</span>
  <span class='id identifier rubyid_base_config'>base_config</span> <span class='op'>=</span> <span class='id identifier rubyid_provide_defaults'>provide_defaults</span> <span class='op'>?</span> <span class='id identifier rubyid_default_config'>default_config</span> <span class='op'>:</span> <span class='lbrace'>{</span><span class='rbrace'>}</span>
  <span class='kw'>return</span> <span class='id identifier rubyid_base_config'>base_