class Rspec::Core::Configuration

def alias_example_to(new_name, extra_options={})

crazy_slow as an example variant that has the crazy_slow speed option
E.g. alias_example_to :crazy_slow, :speed => 'crazy_slow' defines 
def alias_example_to(new_name, extra_options={})
  Rspec::Core::ExampleGroup.alias_example_to(new_name, extra_options)
end