From a213ac360f104d7ba6e9395cd9fdcb8e212a054e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafael=20Mendon=C3=A7a=20Fran=C3=A7a?=
 <rafaelmfranca@gmail.com>
Date: Fri, 18 May 2018 13:35:09 -0400
Subject: Raise a better exception when a invalid depreation behavior is set

Fixes #32928.
---
 activesupport/lib/active_support/deprecation/behaviors.rb | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'activesupport/lib/active_support/deprecation/behaviors.rb')

diff --git a/activesupport/lib/active_support/deprecation/behaviors.rb b/activesupport/lib/active_support/deprecation/behaviors.rb
index 66d6f3225a..3abd25aa85 100644
--- a/activesupport/lib/active_support/deprecation/behaviors.rb
+++ b/activesupport/lib/active_support/deprecation/behaviors.rb
@@ -94,6 +94,10 @@ module ActiveSupport
 
       private
         def arity_coerce(behavior)
+          unless behavior.respond_to?(:call)
+            raise ArgumentError, "#{behavior.inspect} is not a valid deprecation behavior."
+          end
+
           if behavior.arity == 4 || behavior.arity == -1
             behavior
           else
-- 
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