Compiler-enforced ownership semantics is now a part of Swift with non-copyable types. In all honesty I do not know enough of rust to know how on-par the features are, but there is something.

Not sure about using Swift in a kernel as I’m not low-level enough to know that either, but you can indeed use Swift on embedded systems[1].

[1] https://www.swift.org/get-started/embedded/