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-rw-r--r--actionpack/lib/action_dispatch/routing/mapper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index ba4cfb482d..910dc8ed6c 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -1,4 +1,5 @@
require 'active_support/core_ext/hash/except'
+require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/enumerable'
require 'active_support/inflector'