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David Peter db3dcd8ad6
[ty] Eagerly simplify 'True' and 'False' constraints (#18998) 
## Summary

Simplifies literal `True` and `False` conditions to `ALWAYS_TRUE` /
`ALWAYS_FALSE` during semantic index building. This allows us to eagerly
evaluate more constraints, which should help with performance (looks
like there is a tiny 1% improvement in instrumented benchmarks), but
also allows us to eliminate definitely-unreachable branches in
control-flow merging. This can lead to better type inference in some
cases because it allows us to retain narrowing constraints without
solving https://github.com/astral-sh/ty/issues/690 first:
```py
def _(c: int | None):
    if c is None:
        assert False
    
    reveal_type(c)  # int, previously: int | None
```

closes https://github.com/astral-sh/ty/issues/713

## Test Plan

* Regression test for https://github.com/astral-sh/ty/issues/713
* Made sure that all ecosystem diffs trace back to removed false
positives
2025-06-30 13:11:52 +02:00
..
corpus Move corpus tests to ty_python_semantic (#18609) 2025-06-11 08:55:30 +02:00
mdtest [ty] Eagerly simplify 'True' and 'False' constraints (#18998) 2025-06-30 13:11:52 +02:00
primer [ty] Update mypy_primer, add two new projects (#18891) 2025-06-23 13:08:11 +02:00
README.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00

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.