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-rw-r--r--actionpack/lib/action_controller/metal/renderers.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/renderers.rb b/actionpack/lib/action_controller/metal/renderers.rb
index 23c21b0501..79314fa505 100644
--- a/actionpack/lib/action_controller/metal/renderers.rb
+++ b/actionpack/lib/action_controller/metal/renderers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "set"
module ActionController