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-rw-r--r--lib/rack/config.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/rack/config.rb b/lib/rack/config.rb
index dc255d27..41f6f7dd 100644
--- a/lib/rack/config.rb
+++ b/lib/rack/config.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Rack
   # Rack::Config modifies the environment using the block given during
   # initialization.