Message body.

    void deallocateNode()
    {
        assert(first !is null);
        import stdx.allocator.mallocator : Mallocator;

        Node* next = first.next;
        ubyte[] mem = (cast(ubyte*) first)[0 .. Node.sizeof + first.mem.length];
        version (debug_rollback_allocator)
            mem[] = 0;
        Mallocator.instance.deallocate(mem);
        first = next;
    }