message: fix(bin) Remove a warning for unreachable code.
  The `panic!` statement is indeed unreachable for regular usages, but
  not for wrong feature configurations. Allowing `unreachable_code` to
  avoid a warning.
diff: @@ -947,7 +947,7 @@ fn interactive_shell(mut ctx: InteractiveShellContext) -> ShellExitOperation {
  }
  }
  -#[allow(unused_variables)]
  +#[allow(unused_variables, unreachable_code)]
  fn get_backend(backend: Backend, path: &PathBuf) -> Backend {
  // Update backend when a backend flag is `auto`.
  // Use the Singlepass backend if it's enabled and the file provided is larger
  