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-rw-r--r--lib/optparse/date.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/optparse/date.rb b/lib/optparse/date.rb
index d680559f37..d6649c83f1 100644
--- a/lib/optparse/date.rb
+++ b/lib/optparse/date.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'optparse'
require 'date'