From caeb4d3ce5b14936a8dc56921929063af03f46f5 Mon Sep 17 00:00:00 2001
From: Ethan Peterson <ethan.peterson@mit.edu>
Date: Tue, 11 Feb 2020 16:49:38 -0500
Subject: [PATCH] removed empty dictionary definition

---
 openmc/surface.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/openmc/surface.py b/openmc/surface.py
index ca1501b887..5dc25103f3 100644
--- a/openmc/surface.py
+++ b/openmc/surface.py
@@ -25,8 +25,6 @@ _WARNING_KWARGS = """
 will not accept positional parameters for superclass arguments.\
 """
 
-_SURFACE_CLASSES = {}
-
 
 class Surface(IDManagerMixin, metaclass=ABCMeta):
     """An implicit surface with an associated boundary condition.