1 files changed, 4 insertions, 28 deletions
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp
index 246eb935c995..520c9730bdf7 100644
--- a/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp
+++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.fail.cpp
@@ -7,6 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+// UNSUPPORTED: libcpp-has-no-threads
+
 // <mutex>
 
 // template <class Mutex> class lock_guard;
@@ -14,35 +16,9 @@
 // explicit lock_guard(mutex_type& m);
 
 #include <mutex>
-#include <thread>
-#include <cstdlib>
-#include <cassert>
-
-std::mutex m;
-
-typedef std::chrono::system_clock Clock;
-typedef Clock::time_point time_point;
-typedef Clock::duration duration;
-typedef std::chrono::milliseconds ms;
-typedef std::chrono::nanoseconds ns;
-
-void f()
-{
-    time_point t0 = Clock::now();
-    time_point t1;
-    {
-    std::lock_guard<std::mutex> lg = m;
-    t1 = Clock::now();
-    }
-    ns d = t1 - t0 - ms(250);
-    assert(d < ns(2500000));  // within 2.5ms
-}
 
 int main()
 {
-    m.lock();
-    std::thread t(f);
-    std::this_thread::sleep_for(ms(250));
-    m.unlock();
-    t.join();
+    std::mutex m;
+    std::lock_guard<std::mutex> lg = m; // expected-error{{no viable conversion}}
 }