fn emit_unknown_print_request_help(
early_dcx: &EarlyDiagCtxt,
req: &str,
is_nightly: bool,
allowed: &[PrintCategory],
) -> !fn emit_unknown_print_request_help(
early_dcx: &EarlyDiagCtxt,
req: &str,
is_nightly: bool,
allowed: &[PrintCategory],
) -> !