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//! Compiles and runs the Rust code blocks of `README.md` and the book
//! (`book/src/**/*.md`) as doctests, so the prose examples cannot drift
//! from the API. Only built under `cfg(doctest)`; nothing here is part of
//! the library. A block tagged ```` ```rust,ignore ```` is skipped, one
//! tagged ```` ```rust,no_run ```` is compiled but not executed.
//!
//! One module per Markdown file; the module name is the file's path under
//! `book/src/` with `-`, `/` and `.` replaced by `_`, so a failing test is
//! reported as e.g. `doctests::guide_algebra (line 42)`. Every chapter that
//! contains a Rust block is listed; a chapter with only `text`/`sh`/`lean`
//! fences needs no entry.
// ── Getting started ──────────────────────────────────────────────────────
// ── User guide ───────────────────────────────────────────────────────────
// ── Cookbook ─────────────────────────────────────────────────────────────
// ── Reference ────────────────────────────────────────────────────────────
// ── What's new ───────────────────────────────────────────────────────────