Function report_to_exit_code 

pub fn report_to_exit_code(report: &Report) -> ExitCode

Render report and map it to a process exit code.

Prints the diagnostic through the installed handler (matching what Termination for Result<(), Report> does) and honours a code attached via rtb_error::WithExitCode (default 1).

Exposed so a binary’s main can map a builder error — raised before Application::run_and_exit is reachable — to the same exit path.