1 files changed, 25 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/30_threads/scoped_lock/cons/deduction.cc b/libstdc++-v3/testsuite/30_threads/scoped_lock/cons/deduction.cc
index 399de7a5ae6..7d4f5bfc386 100644
--- a/libstdc++-v3/testsuite/30_threads/scoped_lock/cons/deduction.cc
+++ b/libstdc++-v3/testsuite/30_threads/scoped_lock/cons/deduction.cc
@@ -51,3 +51,28 @@ test01()
   std::scoped_lock l2(m2, m3);
   check_type<std::scoped_lock<Lockable, std::mutex>>(l2);
 }
+
+void
+test02()
+{
+  std::scoped_lock l0(std::adopt_lock);
+  check_type<std::scoped_lock<>>(l0);
+
+  struct BasicLockable {
+    void lock() { }
+    void unlock() { }
+  } m1;
+
+  std::scoped_lock l1(std::adopt_lock, m1);
+  check_type<std::scoped_lock<BasicLockable>>(l1);
+
+  struct Lockable {
+    void lock() { }
+    void unlock() { }
+    bool try_lock() { return true; }
+  } m2;
+
+  std::mutex m3;
+  std::scoped_lock l2(std::adopt_lock, m2, m3);
+  check_type<std::scoped_lock<Lockable, std::mutex>>(l2);
+}