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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 6d181e6456..7d0a944381 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -40,7 +40,7 @@ module ActionController
def render_to_string(*)
result = super
if result.respond_to?(:each)
- string = "".dup
+ string = +""
result.each { |r| string << r }
string
else