Work around mypy AST incompatibilities

Author: andreas-zeller

notebooks/DynamicInvariants.ipynb

@@ -1440,7 +1440,7 @@
     "        return ast.copy_location(\n",
     "            ast.FunctionDef(node.name, new_arguments,\n",
     "                            node.body, node.decorator_list,\n",
-    "                            node.returns), node)"
+    "                            node.returns), node)  # type: ignore"
    ]
   },
   {