Index: libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
===================================================================
--- libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
+++ libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
@@ -223,7 +223,7 @@
   assert(p == Expect);
   {
     // Signature test
-    ASSERT_NOEXCEPT(p = std::move(ss));
+    LIBCPP_ONLY(ASSERT_NOEXCEPT(p = std::move(ss)));
   }
 }