undo test

python/mpact/mpactbackend.py

diff --git a/python/mpact/mpactbackend.py b/python/mpact/mpactbackend.py
index 052be51..80b58df 100644
--- a/python/mpact/mpactbackend.py
+++ b/python/mpact/mpactbackend.py
@@ -17,7 +17,6 @@
     LinalgOnTensorsBackend,
 )
 
-a = [  ]
 
 def assert_arg_type_is_supported(ty):
     SUPPORTED = [