From 5b7fd9ad889e54d4d694d310b559c921d7df75cf Mon Sep 17 00:00:00 2001
From: Sven-Hendrik Haase <svenstaro@gmail.com>
Date: Thu, 16 Mar 2017 14:37:58 +0100
Subject: [PATCH] Print a stacktrace on CLI error (closes #2208)

---
 flask/cli.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/flask/cli.py b/flask/cli.py
index bde5a13b..8f8fac03 100644
--- a/flask/cli.py
+++ b/flask/cli.py
@@ -11,6 +11,7 @@
 
 import os
 import sys
+import traceback
 from threading import Lock, Thread
 from functools import update_wrapper
 
@@ -368,6 +369,9 @@ class FlaskGroup(AppGroup):
             # want the help page to break if the app does not exist.
             # If someone attempts to use the command we try to create
             # the app again and this will give us the error.
+            # However, we will not do so silently because that would confuse
+            # users.
+            traceback.print_exc()
             pass
         return sorted(rv)