Allow to silent experimental warning

Author: pitr-ch

lib/concurrent/actress.rb

@@ -42,7 +42,9 @@ def on_message(message)
     # @param block for actress_class instantiation
     # @param args see {.spawn_optionify}
     def self.spawn(*args, &block)
-      warn '[EXPERIMENTAL] A full release of `Actress`, renamed `Actor`, is expected in the 0.7.0 release.'
+      experimental_acknowledged? or
+          warn '[EXPERIMENTAL] A full release of `Actress`, renamed `Actor`, is expected in the 0.7.0 release.'
+
       if Actress.current
         Core.new(spawn_optionify(*args).merge(parent: Actress.current), &block).reference
       else
@@ -52,7 +54,6 @@ def self.spawn(*args, &block)
 
     # as {.spawn} but it'll raise when Actor not initialized properly
     def self.spawn!(*args, &block)
-      warn '[EXPERIMENTAL] A full release of `Actress`, renamed `Actor`, is expected in the 0.7.0 release.'
       spawn(spawn_optionify(*args).merge(initialized: ivar = IVar.new), &block).tap { ivar.no_error! }
     end
 
@@ -71,5 +72,13 @@ def self.spawn_optionify(*args)
           args:  args[2..-1] }
       end
     end
+
+    def self.i_know_it_is_experimental!
+      @experimental_acknowledged = true
+    end
+
+    def self.experimental_acknowledged?
+      !!@experimental_acknowledged
+    end
   end
 end

spec/concurrent/actress_spec.rb

@@ -3,6 +3,7 @@
 
 module Concurrent
   module Actress
+    i_know_it_is_experimental!
     describe 'Concurrent::Actress' do
 
       class Ping