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David Peter c6ce52c29e
[red-knot] Treat empty intersection as 'object', fix intersection simplification (#13880) 
## Summary

- Properly treat the empty intersection as being of type `object`.
- Consequently, change the simplification method to explicitly add
`Never` to the positive side of the intersection when collapsing a type
such as `int & str` to `Never`, as opposed to just clearing both the
positive and the negative side.
- Minor code improvement in `bindings_ty`: use `peekable()` to check
whether the iterator over constraints is empty, instead of handling
first and subsequent elements separately.

fixes #13870

## Test Plan

- New unit tests for `IntersectionBuilder` to make sure the empty
intersection represents `object`.
- Markdown-based regression test for the original issue in #13870
 		2024-10-22 21:02:46 +02:00
..
mdtest [red-knot] Treat empty intersection as 'object', fix intersection simplification (#13880) 2024-10-22 21:02:46 +02:00
README.md [red-knot] document test framework (#13695) 2024-10-10 12:02:01 -07:00

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/red_knot_test/README.md for documentation of this test format.