class RSpec::Core::SharedExampleGroup::Registry

def add(context, name, *metadata_args, &block)
  ensure_block_has_source_location(block) { CallerFilter.first_non_rspec_line }
  if valid_name?(name)
    warn_if_key_taken context, name, block
    shared_example_groups[context][name] = block
  else
    metadata_args.unshift name
  end
  return if metadata_args.empty?
  RSpec.configuration.include SharedExampleGroupModule.new(name, block), *metadata_args
end