//! [`Monotonic`](super::Monotonic) implementations for the nRF series of MCUs.
// An nRF91 chip can be driven through either its secure (`-s`) or its non-secure
// (`-ns`) peripheral alias, but not both: each variant re-exports the same RTC and
// TIMER instances, so enabling both would be ambiguous. Catch that misconfiguration
// with a clear message instead of a cryptic duplicate-import error.
compile_error!;