Index: src/experimental/memory_resource.cpp
===================================================================
--- src/experimental/memory_resource.cpp
+++ src/experimental/memory_resource.cpp
@@ -25,19 +25,20 @@
 class _LIBCPP_TYPE_VIS __new_delete_memory_resource_imp
     : public memory_resource
 {
-public:
-    ~__new_delete_memory_resource_imp() = default;
-
-protected:
-    virtual void* do_allocate(size_t __size, size_t __align)
-        { return _VSTD::__libcpp_allocate(__size, __align); /* FIXME */}
+    void *do_allocate(size_t size, size_t align) override {
+#ifdef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
+        if (__is_overaligned_for_new(align))
+            __throw_bad_alloc();
+#endif
+        return _VSTD::__libcpp_allocate(size, align);
+    }
 
-    virtual void do_deallocate(void* __p, size_t __n, size_t __align) {
-      _VSTD::__libcpp_deallocate(__p, __n, __align); /* FIXME */
+    void do_deallocate(void *p, size_t n, size_t align) override {
+      _VSTD::__libcpp_deallocate(p, n, align);
     }
 
-    virtual bool do_is_equal(memory_resource const & __other) const _NOEXCEPT
-        { return &__other == this; }
+    bool do_is_equal(memory_resource const & other) const _NOEXCEPT override
+        { return &other == this; }
 };
 
 // null_memory_resource()