//! Declare the `force_bits` cfg that the test workflow sets via
//! `RUSTFLAGS=--cfg force_bits=...` (16/32/64) so the matrix can exercise
//! the alternative `Word` widths. Without this declaration, stable Rust's
//! `unexpected_cfgs` lint (added by default in 1.80) fires on the three
//! `#[cfg(force_bits = "...")]` sites in `src/arch/mod.rs`.