I am looking for a command to tell me whether a toolchain would have to be downloaded/installed without actually downloading or installing anything. Hypothetically: ```sh $ rustup <args> # exit code 0 => no installation necessary # exit code 1 => installation necessary ``` Does such a command exist today? Please note that I am aware of this issue and PR: - https://github.com/rust-lang/rustup/issues/3635 - https://github.com/rust-lang/rustup/pull/3985 If I understand correctly, the latter suggests that such a command may be available soon.