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-rw-r--r--examples/middleware.ru1
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diff --git a/examples/middleware.ru b/examples/middleware.ru
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--- a/examples/middleware.ru
+++ b/examples/middleware.ru
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 # sample stand-alone rackup application for Raindrops::Middleware
 require 'rack/lobster'
 require 'raindrops'