Index: test/std/thread/futures/futures.overview/future_errc.pass.cpp
===================================================================
--- test/std/thread/futures/futures.overview/future_errc.pass.cpp
+++ test/std/thread/futures/futures.overview/future_errc.pass.cpp
@@ -13,18 +13,25 @@
 
 // enum class future_errc
 // {
-//     future_already_retrieved = 1,
-//     promise_already_satisfied,
-//     no_state
-//     broken_promise,
+//     broken_promise = implementation-defined,
+//     future_already_retrieved = implementation-defined,
+//     promise_already_satisfied = implementation-defined,
+//     no_state = implementation-defined
 // };
 
 #include <future>
 
 int main()
 {
-    static_assert(static_cast<int>(std::future_errc::future_already_retrieved) == 1, "");
-    static_assert(static_cast<int>(std::future_errc::promise_already_satisfied) == 2, "");
-    static_assert(static_cast<int>(std::future_errc::no_state) == 3, "");
-    static_assert(static_cast<int>(std::future_errc::broken_promise) == 4, "");
+    static_assert(std::future_errc::broken_promise != std::future_errc::future_already_retrieved, "");
+    static_assert(std::future_errc::broken_promise != std::future_errc::promise_already_satisfied, "");
+    static_assert(std::future_errc::broken_promise != std::future_errc::no_state, "");
+    static_assert(std::future_errc::future_already_retrieved != std::future_errc::promise_already_satisfied, "");
+    static_assert(std::future_errc::future_already_retrieved != std::future_errc::no_state, "");
+    static_assert(std::future_errc::promise_already_satisfied != std::future_errc::no_state, "");
+
+    static_assert(std::future_errc::broken_promise != static_cast<std::future_errc>(0), "");
+    static_assert(std::future_errc::future_already_retrieved != static_cast<std::future_errc>(0), "");
+    static_assert(std::future_errc::promise_already_satisfied != static_cast<std::future_errc>(0), "");
+    static_assert(std::future_errc::no_state != static_cast<std::future_errc>(0), "");
 }
Index: test/std/thread/futures/futures.overview/launch.pass.cpp
===================================================================
--- test/std/thread/futures/futures.overview/launch.pass.cpp
+++ test/std/thread/futures/futures.overview/launch.pass.cpp
@@ -32,7 +32,7 @@
     LIBCPP_STATIC_ASSERT(std::launch::any == (std::launch::async | std::launch::deferred), "");
     static_assert(std::launch(0) == (std::launch::async & std::launch::deferred), "");
     LIBCPP_STATIC_ASSERT(std::launch::any == (std::launch::async ^ std::launch::deferred), "");
-    static_assert(std::launch::deferred == ~std::launch::async, "");
+    LIBCPP_STATIC_ASSERT(std::launch::deferred == ~std::launch::async, "");
     std::launch x = std::launch::async;
     x &= std::launch::deferred;
     assert(x == std::launch(0));