From 4a1a88a4ffe60f356413633b4459efe72ce662e1 Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Fri, 21 Nov 2025 12:43:11 -0800
Subject: [PATCH] Prepare for mdbook 0.5 migration

This is the stable-branch version of https://github.com/rust-lang/rustup/pull/4612

Because the pull_request checks are building docs from main and stable,
the checks fail due to mdbook 0.5 changing and removing some fields.
This change should allow the books to work with both 0.4 and 0.5. In
particular:

- `multilingual` -- This was never used, is optional, and is ignored in
  0.4. This is rejected in 0.5.
- `curly-quotes` -- This was renamed to `smart-punctuation` a long while
  ago. Both 0.4 and 0.5 use `smart-punctuation`, and 0.5 has removed the
  old `curly-quotes`.
- `src` -- This isn't needed and is an artifact of an `mdbook init` bug.
---
 doc/dev-guide/book.toml  | 4 +---
 doc/user-guide/book.toml | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/doc/dev-guide/book.toml b/doc/dev-guide/book.toml
index ca6d28278a..891080bd26 100644
--- a/doc/dev-guide/book.toml
+++ b/doc/dev-guide/book.toml
@@ -1,12 +1,10 @@
 [book]
 authors = ["The Rust Project Developers"]
 language = "en"
-multilingual = false
-src = "src"
 title = "The Rustup developer guide"
 
 [output.html]
-curly-quotes = true
+smart-punctuation = true
 edit-url-template = "https://github.com/rust-lang/rustup/edit/master/doc/dev-guide/{path}"
 git-repository-url = "https://github.com/rust-lang/rustup/tree/master/doc/dev-guide"
 site-url = "https://rust-lang.github.io/rustup/dev-guide"
diff --git a/doc/user-guide/book.toml b/doc/user-guide/book.toml
index 06f3c0d2dd..9ac0171ea1 100644
--- a/doc/user-guide/book.toml
+++ b/doc/user-guide/book.toml
@@ -3,7 +3,7 @@ authors = ["The Rust Project Developers"]
 title = "The rustup book"
 
 [output.html]
-curly-quotes = true
+smart-punctuation = true
 edit-url-template = "https://github.com/rust-lang/rustup/edit/master/doc/user-guide/{path}"
 git-repository-url = "https://github.com/rust-lang/rustup/tree/master/doc/user-guide"
 site-url = "https://rust-lang.github.io/rustup/"