From 270d1d69ede6a67f607ab5dba56d0cc39a8cfe95 Mon Sep 17 00:00:00 2001
From: Mark Simulacrum <mark.simulacrum@gmail.com>
Date: Thu, 13 Jul 2017 22:37:33 -0600
Subject: [PATCH] Make the book default.

---
 src/bootstrap/doc.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index 3c3f4bf2be73..0030b46b32e1 100644
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -229,6 +229,7 @@ pub struct TheBook {
 
 impl Step for TheBook {
     type Output = ();
+    const DEFAULT: bool = true;
 
     fn should_run(_builder: &Builder, path: &Path) -> bool {
         path.ends_with("src/doc/book")