Discard partials remaining after inference failure#20126
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ilevkivskyi merged 3 commits intopython:masterfrom Oct 28, 2025
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All primer hits are correct - empty list in sympy, |
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(cc @JukkaL - you recently authored |
ilevkivskyi
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Oct 27, 2025
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I think this is actually the correct fix (unless @JukkaL disagrees), I however have a suggestion on the fallback behavior.
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LG, couple more comments.
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Diff from mypy_primer, showing the effect of this PR on open source code: mongo-python-driver (https://github.com/mongodb/mongo-python-driver)
+ pymongo/synchronous/topology.py:114: error: Need type annotation for "_events" [var-annotated]
+ pymongo/synchronous/topology.py:129: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_opened" [union-attr]
+ pymongo/synchronous/topology.py:148: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/synchronous/topology.py:164: error: Item "None" of "_EventListeners | None" has no attribute "publish_server_opened" [union-attr]
+ pymongo/synchronous/topology.py:496: error: Item "None" of "_EventListeners | None" has no attribute "publish_server_description_changed" [union-attr]
+ pymongo/synchronous/topology.py:508: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/synchronous/topology.py:575: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/synchronous/topology.py:734: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/synchronous/topology.py:742: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_closed" [union-attr]
+ pymongo/asynchronous/topology.py:114: error: Need type annotation for "_events" [var-annotated]
+ pymongo/asynchronous/topology.py:129: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_opened" [union-attr]
+ pymongo/asynchronous/topology.py:148: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/asynchronous/topology.py:164: error: Item "None" of "_EventListeners | None" has no attribute "publish_server_opened" [union-attr]
+ pymongo/asynchronous/topology.py:496: error: Item "None" of "_EventListeners | None" has no attribute "publish_server_description_changed" [union-attr]
+ pymongo/asynchronous/topology.py:508: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/asynchronous/topology.py:575: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/asynchronous/topology.py:736: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_description_changed" [union-attr]
+ pymongo/asynchronous/topology.py:744: error: Item "None" of "_EventListeners | None" has no attribute "publish_topology_closed" [union-attr]
sympy (https://github.com/sympy/sympy)
+ sympy/core/add.py:218: error: Need type annotation for "rv" [var-annotated]
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Fixes #16573.
Fixes #3031.
When we infer something with Never as a replacement for a partial type, we cannot ignore that result entirely: if we do that, any use of that variable down the road will still refer to
partial<None>, causing reachability issues and unexpected partials leaks.