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> I usually find myself wishing I could have some macro where I just write in C and have it exposed as an unsafe back in Rust.

There’s a macro for doing this with Assembly, I can imagine one could be made for C. But why wouldn’t you just write unsafe rust at that point?

Perhaps because you want to import something you don’t want to rewrite? There’s a lot of tested C code out there.

That's a good point.

Colocation, and avoiding the ceremony of standing up all the extern types (and integrating a separate C compiler, etc)