I'm pretty sure all uses of RUSTC_BOOTSTRAP are to get around limitations in Rust's SIMD support.
The main users are encoding_rs which depends on packed_simd and qcms which needs NEON support.
So it's not like we're going around using all sorts of unstable features. It's very targeted and at least in qcms's case unlikely to change before stabilization.
The main users are encoding_rs which depends on packed_simd and qcms which needs NEON support.
So it's not like we're going around using all sorts of unstable features. It's very targeted and at least in qcms's case unlikely to change before stabilization.