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-rw-r--r--actionpack/lib/action_controller/metal/rendering.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index 67f207afc2..6d181e6456 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -1,4 +1,4 @@
-require "active_support/core_ext/string/filters"
+# frozen_string_literal: true
module ActionController
module Rendering
@@ -40,7 +40,7 @@ module ActionController
def render_to_string(*)
result = super
if result.respond_to?(:each)
- string = ""
+ string = "".dup
result.each { |r| string << r }
string
else