Rails 4 - Scope

In rails 4, scopes should take a proc object or a block. Take an example this User model

Class User < ActiveRecord::Base
  attr_accessor :name,:age,:status

  def initialize(name, age)
    @name = name
    @age = age
  end
end

I would like to make default scope based on status 'user' and admin scope based on status 'admin'. In rails 3, I can make scope like this

#Rails 3
scope :admin, where(status: 'admin')
default_scope where(status: 'user')

Rails 4, I can make scope this way

#Rails 4
default_scope { where(status: 'user') } #  block
#default_scope ->{ where(status: 'admin) } #Proc valid
scope :admin, ->{ where(status: 'admin') }

If we try to use scope without(see rails3 examples) passing proc or block in Rails 4, it triggers DEPRECATION WARNING message.