From a4fa8960970a275013cc1ef68d153222c6c1a5fb Mon Sep 17 00:00:00 2001
From: Oliver Bestwalter <oliver.bestwalter@avira.com>
Date: Fri, 15 Sep 2017 10:47:27 +0200
Subject: [PATCH] fix oversight in fixing #595: inherit new exception from
 Error

---
 tox/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tox/__init__.py b/tox/__init__.py
index b3d38b851..4f2c0bdba 100644
--- a/tox/__init__.py
+++ b/tox/__init__.py
@@ -16,7 +16,7 @@ class Error(Exception):
         def __str__(self):
             return "%s: %s" % (self.__class__.__name__, self.args[0])
 
-    class MissingSubstitution(Exception):
+    class MissingSubstitution(Error):
         FLAG = 'TOX_MISSING_SUBSTITUTION'
         """placeholder for debugging configurations"""
         def __init__(self, name):