[gwbas1c]

You miss the point: I'm referring to cases where you pass pointers from one language into another. In that case, because GC is opt-in, it's the wrong approach for managing whatever you're passing into the non-Rust language.

In your case, do you need to get a pointer to a GC<T> and use it within Rust? I haven't worked with Rust at that level yet, so perhaps I'm ignorant of a more common use case.