deprecation.rb in activesupport-7.2.0.beta1

- old
+ new

@@ -1,9 +1,7 @@
 # frozen_string_literal: true
 
-require "singleton"
-
 module ActiveSupport
   # = Active Support \Deprecation
   #
   # \Deprecation specifies the API used by \Rails to deprecate methods, instance variables, objects, and constants. It's
   # also available for gems or applications.
@@ -39,34 +37,39 @@
     # defined by the time their files were loaded. Since some of them reopen
     # ActiveSupport::Deprecation its autoload would be triggered, resulting in
     # a circular require warning for active_support/deprecation.rb.
     #
     # So, we define the constant first, and load dependencies later.
-    require "active_support/deprecation/instance_delegator"
     require "active_support/deprecation/behaviors"
     require "active_support/deprecation/reporting"
     require "active_support/deprecation/disallowed"
     require "active_support/deprecation/constant_accessor"
     require "active_support/deprecation/method_wrappers"
     require "active_support/deprecation/proxy_wrappers"
     require "active_support/deprecation/deprecators"
     require "active_support/core_ext/module/deprecation"
     require "concurrent/atomic/thread_local_var"
 
-    include InstanceDelegator
     include Behavior
     include Reporting
     include Disallowed
     include MethodWrapper
 
+    MUTEX = Mutex.new # :nodoc:
+    private_constant :MUTEX
+
+    def self._instance # :nodoc:
+      @_instance ||= MUTEX.synchronize { @_instance ||= new }
+    end
+
     # The version number in which the deprecated behavior will be removed, by default.
     attr_accessor :deprecation_horizon
 
     # It accepts two parameters on initialization. The first is a version of library
     # and the second is a library name.
     #
     #   ActiveSupport::Deprecation.new('2.0', 'MyLibrary')
-    def initialize(deprecation_horizon = "7.2", gem_name = "Rails")
+    def initialize(deprecation_horizon = "7.3", gem_name = "Rails")
       self.gem_name = gem_name
       self.deprecation_horizon = deprecation_horizon
       # By default, warnings are not silenced and debugging is off.
       self.silenced = false
       self.debug = false