module RSpec::Expectations::Syntax

def enable_expect(syntax_host=::RSpec::Matchers)
  return if expect_enabled?(syntax_host)
  syntax_host.module_exec do
    def expect(value=::RSpec::Expectations::ExpectationTarget::UndefinedValue, &block)
      ::RSpec::Expectations::ExpectationTarget.for(value, block)
    end
  end
end