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-rw-r--r--actionpack/lib/action_controller/metal/rendering.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index d32eabf9ba..dcb48be80a 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -42,7 +42,7 @@ module ActionController
def render_to_string(*)
result = super
if result.respond_to?(:each)
- string = ""
+ string = "".dup
result.each { |r| string << r }
string
else