[bugfix] Prevent double visit of sum/product children

python/dune/codegen/ufl/visitor.py

@@ -282,7 +282,7 @@ class UFL2LoopyVisitor(ModifiedTerminalTracker):
         ops = tuple(self.call(op) for op in o.ufl_operands)
         if all(isinstance(op, (int, float)) for op in ops):
             return ptproduct(ops)
-        return prim.flattened_product(tuple(self.call(op) for op in o.ufl_operands))
+        return prim.flattened_product(ops)
 
     def float_value(self, o):
         return o.value()
@@ -297,7 +297,7 @@ class UFL2LoopyVisitor(ModifiedTerminalTracker):
         ops = tuple(self.call(op) for op in o.ufl_operands)
         if all(isinstance(op, (int, float)) for op in ops):
             return sum(ops)
-        return prim.flattened_sum(tuple(self.call(op) for op in o.ufl_operands))
+        return prim.flattened_sum(ops)
 
     def zero(self, o):
         # UFL has Zeroes with shape. We ignore those indices.