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Shaygan Hooshyari 557d583e32
Support typing.NoReturn and typing.Never (#14559) 
Fix #14558 
## Summary

- Add `typing.NoReturn` and `typing.Never` to known instances and infer
them as `Type::Never`
- Add `is_assignable_to` cases for `Type::Never`

I skipped emitting diagnostic for when a function is annotated as
`NoReturn` but it actually returns.

## Test Plan

Added tests from

https://github.com/python/typing/blob/main/conformance/tests/specialtypes_never.py
except from generics and checking if the return value of the function
and the annotations match.

---------

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Carl Meyer <carl@astral.sh>
2024-11-25 21:37:55 +00:00
..
mdtest Support typing.NoReturn and typing.Never (#14559) 2024-11-25 21:37:55 +00:00
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.