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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 ab8927dd0f..a29f3f44b5 100644
--- a/test/test_mutex_m.rb
+++ b/test/test_mutex_m.rb
@@ -5,6 +5,7 @@ require 'mutex_m'
class TestMutexM < Test::Unit::TestCase
def test_cv_wait
o = Object.new
+ o.instance_variable_set(:@foo, nil)
o.extend(Mutex_m)
c = ConditionVariable.new
t = Thread.start {