[red-knot] Ensure differently ordered unions are considered equivalent when they appear inside tuples inside top-level intersections #15743
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…t when they appear inside tuples inside top-level intersections
AlexWaygood
requested review from
carljm,
MichaReiser and
sharkdp
as code owners
dcreager
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Jan 27, 2025
* main: Run `cargo update` (#15769) [red-knot] Document public symbol type inferece (#15766) Update dawidd6/action-download-artifact action to v8 (#15760) Update NPM Development dependencies (#15758) Update pre-commit dependencies (#15756) Update dependency ruff to v0.9.3 (#15755) Update dependency mdformat-mkdocs to v4.1.2 (#15754) Update Rust crate uuid to v1.12.1 (#15753) Update Rust crate unicode-ident to v1.0.15 (#15752) Fix docstring in ruff_annotate_snippets (#15748) Update Rust crate insta to v1.42.1 (#15751) Update Rust crate clap to v4.5.27 (#15750) Add references to `trio.run_process` and `anyio.run_process` (#15761) [`ruff`] Do not emit diagnostic when all arguments to `zip()` are variadic (`RUF058`) (#15744) [red-knot] Ensure differently ordered unions are considered equivalent when they appear inside tuples inside top-level intersections (#15743) [red-knot] Ensure differently ordered unions and intersections are understood as equivalent even inside arbitrarily nested tuples (#15740) [red-knot] Promote the `all_type_pairs_are_assignable_to_their_union` property test to stable (#15739) [`pylint`] Do not trigger `PLR6201` on empty collections (#15732) Improve the file watching failure error message (#15728) Speed symbol state merging back up (#15731)
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Summary
Another oversight in type equivalence, that I spotted by re-reading some of the code in
types.rs. In this round of type-equivalence whackamole, we were not consideringtuple[P | Q] & Rto be equivalent totuple[Q | P] & R. This bug only manifested if a union was nested directly inside a tuple nested directly inside a top-level intersection.It sure would be easier to ensure we got all these cases right if unions only ever appeared in a canonical order 😉 I'm not yet pushing for us to reconsider the direction we went in #15516, but there is definitely a maintenance burden here.
Test Plan
main