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-rw-r--r--test/optparse/test_acceptable.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/optparse/test_acceptable.rb b/test/optparse/test_acceptable.rb
index ee8479cc1e..0c7590bae3 100644
--- a/test/optparse/test_acceptable.rb
+++ b/test/optparse/test_acceptable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require_relative 'test_optparse'
class TestOptionParser::Acceptable < TestOptionParser