[Issue 13972] Make scoped, Unique, and RefCounted @nogc

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13972

--- Comment #5 from weaselcat <r9shackleford at gmail.com> ---
AFAICT The only thing blocking refcounted from being @nogc is the enforce in
the initialize now.

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