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Suneet Tipirneni ef8281b695
[ty] add support for mapped union and intersection subscript loads (#18846) 
## Summary

Note this modifies the diagnostics a bit. Previously performing
subscript access on something like `NotSubscriptable1 |
NotSubscriptable2` would report the full type as not being
subscriptable:

```
[non-subscriptable] "Cannot subscript object of type `NotSubscriptable1 | NotSubscriptable2` with no `__getitem__` method"
```

Now each erroneous constituent has a separate error:

```
[non-subscriptable] "Cannot subscript object of type `NotSubscriptable2` with no `__getitem__` method"
[non-subscriptable] "Cannot subscript object of type `NotSubscriptable1` with no `__getitem__` method"
```

Closes https://github.com/astral-sh/ty/issues/625

## Test Plan

 mdtest

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
2025-06-23 16:38:01 +00:00
..
corpus Move corpus tests to ty_python_semantic (#18609) 2025-06-11 08:55:30 +02:00
mdtest [ty] add support for mapped union and intersection subscript loads (#18846) 2025-06-23 16:38:01 +00:00
primer [ty] Update mypy_primer, add two new projects (#18891) 2025-06-23 13:08:11 +02:00
README.md

README.md

Markdown files within the mdtest/ subdirectory are tests of type inference and type checking; executed by the tests/mdtest.rs integration test.

See crates/ty_test/README.md for documentation of this test format.