From eaf891dfdabc824deda825ff068ea3cbf2c4afd8 Mon Sep 17 00:00:00 2001
From: Weihang Lo <weihanglo@users.noreply.github.com>
Date: Sat, 9 Nov 2019 03:14:53 +0000
Subject: [PATCH] Enable section-folding of table of content

The section-folding configuration has landed in mdBook. Enable this would make sidebar a little bit clear.
---
 book.toml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/book.toml b/book.toml
index 60770d4eee..45ae5fd944 100644
--- a/book.toml
+++ b/book.toml
@@ -6,3 +6,6 @@ author = "The Rust Community"
 [output.html.playpen]
 editable = true
 editor = "ace"
+
+[output.html.fold]
+enable = true