test: Suppress exception-required tests.

test/numerics/rand/rand.device/ctor.xfail.pass.cpp

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// class random_device;
+
+// explicit random_device(const string& token = "/dev/urandom");
+
+#include <random>
+#include <cassert>
+
+int main()
+{
+    try
+    {
+        std::random_device r("wrong file");
+        assert(false);
+    }
+    catch (const std::system_error& e)
+    {
+    }
+    {
+        std::random_device r;
+    }
+    {
+        std::random_device r("/dev/urandom");;
+    }
+    {
+        std::random_device r("/dev/random");;
+    }
+}