[libc++] Fix test failing on macOS with modules enabled

ldionne · ldionne · commit 3a44223711ec · 2023-10-03T13:54:04.000-04:00
diff --git a/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/pr40459.pass.cpp b/libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.weak/util.smartptr.weak.const/pr40459.pass.cpp
@@ -20,6 +20,7 @@
 #include <cassert>
 #include <cstring>
 #include <memory>
+#include <new>
 #include <utility>
 
 #include "test_macros.h"
