```ruby
module SinatraMore
  module WardenHelpers
    # Returns the current authenticated user
    def current_user
      warden_handler.user
    end

    # Login the user through the specified warden strategy
    def authenticate_user!
      warden_handler.authenticate!
    end

    # Signs out the user
    def logout_user!
      warden_handler.logout
    end

    # Returns true if the user has authenticated
    def logged_in?
      warden_handler.authenticated?
    end

    # If a block is given, only yields the content if the user is authenticated
    # If no block is given, returns true if the user is logged in
    def authenticated?(&block)
      if block_given?
        authenticated_content = capture_haml(&block)
        logged_in? ? haml_concat(authenticated_content) : ''
      else
        return logged_in?
      end
    end

    # Forces a user to return to a fail path unless they are authorized
    # Used to require a user be authenticated before routing to an action
    def must_be_authorized!(failure_path=nil)
      redirect_to(failure_path ? failure_path : '/') unless authenticated?
    end

    # Returns the raw warden authentication handler
    def warden_handler
      request.env['warden']
    end
  end
end```

Fix authenticated? with block to only evaluate content when logged_in?
user
```ruby
module SinatraMore
  module WardenHelpers
    # Returns the current authenticated user
    def current_user
      warden_handler.user
    end

    # Login the user through the specified warden strategy
    def authenticate_user!
      warden_handler.authenticate!
    end

    # Signs out the user
    def logout_user!
      warden_handler.logout
    end

    # Returns true if the user has authenticated
    def logged_in?
      warden_handler.authenticated?
    end

    # If a block is given, only yields the content if the user is authenticated
    # If no block is given, returns true if the user is logged in
    def authenticated?(&block)
      if block_given?
        return '' unless logged_in?
        authenticated_content = capture_haml(&block)
        haml_concat(authenticated_content)
      else
        return logged_in?
      end
    end

    # Forces a user to return to a fail path unless they are authorized
    # Used to require a user be authenticated before routing to an action
    def must_be_authorized!(failure_path=nil)
      redirect_to(failure_path ? failure_path : '/') unless authenticated?
    end

    # Returns the raw warden authentication handler
    def warden_handler
      request.env['warden']
    end
  end
end```
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