class RSpec::Matchers::DifferentiateBlockMethodTypes

def capture_added_methods(object, method_list)
  object.__send__(:define_method, :singleton_method_added) do |method_name|
    method_list << method_name
  end
  method_list.delete(:singleton_method_added)
end

def ignore_macro_methods
  def singleton_class.method_missing(*); self; end
end

def initialize(*block_args, &block)
  @block_args = block_args
  @block = block
  ignore_macro_methods
  capture_added_methods(singletons_singleton_class, singleton_methods)
  capture_added_methods(singleton_class, instance_methods)
  singleton_class.class_exec(*block_args, &block)
end

def instance_methods
  @instance_methods ||= []
end

def singleton_class
  class << self; self; end
end

def singleton_methods
  @singleton_methods ||= []
end

def singletons_singleton_class
  class << singleton_class; self; end
end