From 5b9e9d018f6edf55cb2f9b4f20547b57b468e61b Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Sat, 14 Nov 2020 17:37:02 -0800
Subject: [PATCH] Fix displaying errors when rustbook tests fail.

---
 Cargo.lock                     | 1 +
 src/tools/rustbook/Cargo.toml  | 1 +
 src/tools/rustbook/src/main.rs | 1 +
 3 files changed, 3 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index c72c7b8481b..15ba3a29bf3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3016,6 +3016,7 @@ name = "rustbook"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "env_logger 0.7.1",
  "mdbook",
 ]
 
diff --git a/src/tools/rustbook/Cargo.toml b/src/tools/rustbook/Cargo.toml
index f5e5c0867b4..99310157a64 100644
--- a/src/tools/rustbook/Cargo.toml
+++ b/src/tools/rustbook/Cargo.toml
@@ -7,6 +7,7 @@ edition = "2018"
 
 [dependencies]
 clap = "2.25.0"
+env_logger = "0.7.1"
 
 [dependencies.mdbook]
 version = "0.4.3"
diff --git a/src/tools/rustbook/src/main.rs b/src/tools/rustbook/src/main.rs
index c87c64540ad..63d84ae9732 100644
--- a/src/tools/rustbook/src/main.rs
+++ b/src/tools/rustbook/src/main.rs
@@ -9,6 +9,7 @@ use mdbook::errors::Result as Result3;
 use mdbook::MDBook;
 
 fn main() {
+    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("warn")).init();
     let d_message = "-d, --dest-dir=[dest-dir]
 'The output directory for your book{n}(Defaults to ./book when omitted)'";
     let dir_message = "[dir]