module RSpec::Mocks

def setup(host=nil)
  host_is_from_rspec_core = defined?(::RSpec::Core::ExampleGroup) && host.is_a?(::RSpec::Core::ExampleGroup)
  if host
    unless host_is_from_rspec_core
      RSpec.deprecate(
        "The host argument to `RSpec::Mocks.setup`",
        :replacement => "`include RSpec::Mocks::ExampleMethods` in #{host.inspect}"
      )
    end
    (class << host; self; end).class_eval do
      include RSpec::Mocks::ExampleMethods
    end
  end
  space.outside_example = false
end