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-rw-r--r--test/test_mutex_m.rb1
1 files changed, 0 insertions, 1 deletions
diff --git a/test/test_mutex_m.rb b/test/test_mutex_m.rb
index 0365265b8c..30971dd352 100644
--- a/test/test_mutex_m.rb
+++ b/test/test_mutex_m.rb
@@ -1,6 +1,5 @@
# frozen_string_literal: false
require 'test/unit'
-require 'thread'
require 'mutex_m'
class TestMutexM < Test::Unit::TestCase