</span>: We could
    reuse the <code class="code">Allocator</code> template parameter of containers
    by adding a sentinel wrapper <code class="code">debug&lt;&gt;</code> that
    signals the user's intention to use debugging, and pick up
    the <code class="code">debug&lt;&gt;</code> allocator wrapper in a partial
    specialization. However, this has two drawbacks: first, there is a
    conformance issue because the default allocator would not be the
    standard-specified <code class="code">std::allo