add type check to CustomCodeNode.__eq__

pystencils/backends/cbackend.py

@@ -152,7 +152,7 @@ class CustomCodeNode(Node):
         return self._symbols_read - self._symbols_defined
 
     def __eq__(self, other):
-        return self._code == other._code
+        return type(self) == type(other) and self._code == other._code
 
     def __hash__(self):
         return hash(self._code)