This code was needed to work around http://redmine.ruby-lang.org/issues/show/2494. Since that bug is now closed in Ruby, we can remove it.

activesupport/lib/active_support/whiny_nil.rb

@@ -43,10 +43,7 @@ class NilClass
 
   private
     def method_missing(method, *args, &block)
-      # Ruby 1.9.2: disallow explicit coercion via method_missing.
-      if method == :to_ary || method == :to_str
-        raise NoMethodError, "undefined method `#{method}' for nil:NilClass"
-      elsif klass = METHOD_CLASS_MAP[method]
+      if klass = METHOD_CLASS_MAP[method]
         raise_nil_warning_for klass, method, caller
       else
         super