From cdff6602fdd79245259aa7101c7db8e582a3fb3e Mon Sep 17 00:00:00 2001
From: Thomas Gibson <gibsonthomas1120@hotmail.com>
Date: Wed, 21 Apr 2021 20:22:41 -0500
Subject: [PATCH] Fix memoize key

---
 grudge/op.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grudge/op.py b/grudge/op.py
index c62732d1..c1270df0 100644
--- a/grudge/op.py
+++ b/grudge/op.py
@@ -329,8 +329,8 @@ def _elwise_linear_loopy_prg(actx):
 def reference_mass_matrix(actx, out_element_group, in_element_group):
     @keyed_memoize_in(
         actx, reference_mass_matrix,
-        lambda (out_grp, in_grp): (out_grp.discretization_key(),
-                                   in_grp.discretization_key()))
+        lambda out_grp, in_grp: (out_grp.discretization_key(),
+                                 in_grp.discretization_key()))
     def get_ref_mass_mat(out_grp, in_grp):
         if out_grp == in_grp:
             from meshmode.discretization.poly_element import mass_matrix
-- 
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