From 19b59a4a5e8a4ee68849eb316e79b951a05febe1 Mon Sep 17 00:00:00 2001
From: Hollow Man <hollowman@opensuse.org>
Date: Mon, 18 Aug 2025 19:46:18 +0300
Subject: [PATCH] Support building books using mdbook in main (v0.5.x)

- Missing preprocessors are now an error unless the `optional` field is set: https://github.com/rust-lang/mdBook/commit/d7892f56013ea2cab11c7c581f2c5f2c1d3cb2c6
- Fix: [ERROR] (mdbook_core::utils): Error: Failed to deserialize `{name}`. Caused By: unknown field `editor`, expected one of `editable`, `copyable`, `copy-js`, `line-numbers`, `runnable`

Signed-off-by: Hollow Man <hollowman@opensuse.org>
---
 book.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/book.toml b/book.toml
index 16a9d6f80b..65d8616b18 100644
--- a/book.toml
+++ b/book.toml
@@ -5,7 +5,6 @@ authors = ["The Rust Community"]
 
 [output.html.playpen]
 editable = true
-editor = "ace"
 line-numbers = true
 
 [output.html.fold]
@@ -27,4 +26,5 @@ edition = "2021"
 extra-watch-dirs = ["po"]
 
 [preprocessor.gettext]
+optional = true
 after = ["links"]