test: Mark 316 tests as XFAIL to rename to xfail.pass.cpp.

test/numerics/rand/rand.adapt/rand.adapt.disc/io.xfail.pass.cpp

@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// template<class Engine, size_t p, size_t r>
+// class discard_block_engine
+
+// template <class charT, class traits,
+//           class Engine, size_t p, size_t r>
+// basic_ostream<charT, traits>&
+// operator<<(basic_ostream<charT, traits>& os,
+//            const discard_block_engine<Engine, p, r>& x);
+//
+// template <class charT, class traits,
+//           class Engine, size_t p, size_t r>
+// basic_istream<charT, traits>&
+// operator>>(basic_istream<charT, traits>& is,
+//            discard_block_engine<Engine, p, r>& x);
+
+#include <random>
+#include <sstream>
+#include <cassert>
+
+void
+test1()
+{
+    typedef std::ranlux24 E;
+    E e1;
+    e1.discard(100);
+    std::ostringstream os;
+    os << e1;
+    std::istringstream is(os.str());
+    E e2;
+    is >> e2;
+    assert(e1 == e2);
+}
+
+void
+test2()
+{
+    typedef std::ranlux48 E;
+    E e1;
+    e1.discard(100);
+    std::ostringstream os;
+    os << e1;
+    std::istringstream is(os.str());
+    E e2;
+    is >> e2;
+    assert(e1 == e2);
+}
+
+int main()
+{
+    test1();
+    test2();
+}