Require SafeTaskExecutor in Promise

arnvald · web-flow · commit 885d0d805827 · 2016-07-14T00:24:50.000+08:00
diff --git a/lib/concurrent/promise.rb b/lib/concurrent/promise.rb
@@ -2,6 +2,7 @@
 require 'concurrent/constants'
 require 'concurrent/errors'
 require 'concurrent/ivar'
+require 'concurrent/executor/safe_task_executor'
 
 require 'concurrent/options'
 
