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What happens in the kernel has no effect on userspace apps. And Rust is only being used for drivers, not the kernel itself. If you want a Spotify TUI, take a look at this: https://github.com/Rigellute/spotify-tui
It's more likely that by the time the situation you describe comes to pass that gccrs will have matured and that rustc will not be a builddep for the generic kernel.
My understanding was the current preference was going to be rust_codegen_gcc which still uses the rustc front end, and leverages gcc's backend via libgccjit. Though to be clear the Linux-Rust people were "either will probably work for us on that long term thing, we will let them evolve before we decide on which" and "for now neither is close to ready enough, so we will require rustc/llvm stuff for a while yet".
Also checkout https://github.com/sm00th/bitlbee-discord if you like irc for everything :D