//! # span_lang
//!
//! Source positions, spans, and byte-to-line/col mapping for language tooling.
//!
//! Scaffold release (v0.1.0). The public surface is being designed across the
//! 0.x series and frozen at v1.0. See `docs/API.md` and `dev/ROADMAP.md` for the
//! current phase scope.