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-rw-r--r--activesupport/lib/active_support/concern.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/concern.rb b/activesupport/lib/active_support/concern.rb
index 0403eb70ca..f1dcda7dfa 100644
--- a/activesupport/lib/active_support/concern.rb
+++ b/activesupport/lib/active_support/concern.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module ActiveSupport
# A typical module looks like this:
#