Fixup fastdg

python/dune/perftool/sumfact/symbolic.py

@@ -361,19 +361,23 @@ class VectorizedSumfactKernel(SumfactKernelBase, ImmutableRecord, prim.Variable)
 
     @property
     def coeff_func(self):
-        return tuple(k.coeff_func for k in self.kernels)
+        assert len(set(k.coeff_func for k in self.kernels)) == 1
+        return self.kernels[0].coeff_func
 
     @property
     def element(self):
-        return tuple(k.element for k in self.kernels)
+        assert len(set(k.element for k in self.kernels)) == 1
+        return self.kernels[0].element
 
     @property
     def component(self):
-        return tuple(k.component for k in self.kernels)
+        assert len(set(k.component for k in self.kernels)) == 1
+        return self.kernels[0].component
 
     @property
     def accumvar(self):
-        return tuple(k.accumvar for k in self.kernels)
+        assert len(set(k.accumvar for k in self.kernels)) == 1
+        return self.kernels[0].accumvar
 
     #
     # Define some properties only needed for this one