class RSpec::Matchers::DSL::Matcher

def for_expected(*expected)
  @expected = expected
  dup.instance_eval do
    instance_variables.map {|ivar| ivar.intern}.each do |ivar|
      instance_variable_set(ivar, nil) unless (PERSISTENT_INSTANCE_VARIABLES + [:@expected]).include?(ivar)
    end
    @messages = {}
    @deprecated_methods = Set.new
    @block_method_differentiator = DifferentiateBlockMethodTypes.new(*@expected, &@declarations)
    making_declared_methods_public do
      instance_eval_with_args(*@expected, &@declarations)
    end
    @define_block_executed = true
    self
  end
end