There's no "nogc" containers in phobos, or allocators, or an idiomatic way to do safe manual memory management. It expects you to do it the C way. It's also impossible to implement some things because of how D does moving. There's a DIP in the works to change how moving works, but it's overly complicated and bound to introduce even more bugs. https://github.com/dlang/DIPs/blob/master/DIPs/DIP1040.md
