class RSpec::Core::Configuration

def include(mod, *filters)

Other tags:
    See: #prepend -
    See: #extend -
    See: #include_context -

Other tags:
    Note: - Filtered module inclusions can also be applied to 
def include(mod, *filters)
  define_mixed_in_module(mod, filters, @include_modules, :include) do |group|
    safe_include(mod, group)
  end
end