From b53100901bcbfce96d49455717f0fed128eb087d Mon Sep 17 00:00:00 2001
From: Mark Mansi <markm@cs.wisc.edu>
Date: Tue, 5 Nov 2019 13:35:47 -0600
Subject: [PATCH] fold subchapters

---
 src/doc/rustc-dev-guide/book.toml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/doc/rustc-dev-guide/book.toml b/src/doc/rustc-dev-guide/book.toml
index b5bced996d0b..82a6b59b03f8 100644
--- a/src/doc/rustc-dev-guide/book.toml
+++ b/src/doc/rustc-dev-guide/book.toml
@@ -8,7 +8,9 @@ create-missing = false
 
 [output.html]
 
-[output.html.search]
+[output.html.fold]
+enable = true
+level = 1
 
 [output.linkcheck]
 follow-web-links = true