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-rw-r--r--test/test_mutex_m.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/test_mutex_m.rb b/test/test_mutex_m.rb
index a29f3f44b5..e31c086f01 100644
--- a/test/test_mutex_m.rb
+++ b/test/test_mutex_m.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'thread'
require 'mutex_m'