Fix typo in `__setitem__` error message

pytensor/tensor/variable.py

@@ -598,7 +598,7 @@ class _tensor_py_operators:
 
     def __setitem__(self, key, value):
         raise TypeError(
-            "TensorVariable does not support item assignment. Use the output of `set` or `add` instead."
+            "TensorVariable does not support item assignment. Use the output of `x[idx].set` or `x[idx].inc` instead."
         )
 
     def take(self, indices, axis=None, mode="raise"):

tests/tensor/test_variable.py

+import re
 from copy import copy
 
 import numpy as np
@@ -444,7 +445,7 @@ class TestTensorInstanceMethods:
     def test_set_item_error(self):
         x = matrix("x")
 
-        msg = "Use the output of `set` or `add` instead."
+        msg = re.escape("Use the output of `x[idx].set` or `x[idx].inc` instead.")
         with pytest.raises(TypeError, match=msg):
             x[0] = 5
         with pytest.raises(TypeError, match=msg):