class RSpec::Core::MemoizedHelpers::AllHookMemoizedHash

def self.isolate_for_all_hook(example_group_instance)
  hash_type = self
  example_group_instance.instance_eval do
    @__memoized = hash_type.new(example_group_instance)
    begin
      yield
    ensure
      @__memoized.preserve_accessed_lets
      @__memoized = nil
    end
  end
end

def []=(key, value)
  @hash[key] = value
end

def fetch(key, &block)
  description = if key == :subject
    "subject"
  else
    "let declaration `#{key}`"
  end
  ::RSpec.warn_deprecation <<-EOS
ION: #{description} accessed in #{article} #{hook_expression} hook at:
erFilter.first_non_rspec_line}
d `subject` declarations are not intended to be called
icle} #{hook_expression} hook, as they exist to define state that
 between each example, while #{hook_expression} exists to
ntention}.
deprecated behavior that will not be supported in RSpec 3.
  @hash.fetch(key, &block)
end

def initialize(example_group_instance)
  @example_group_instance = example_group_instance
  @hash = {}
end

def preserve_accessed_lets
  hash = @hash
  @example_group_instance.class.class_eval do
    hash.each do |key, value|
      undef_method(key) if method_defined?(key)
      define_method(key) { value }
    end
  end
end