[ty] allow T: Never as subtype of Never
#18687
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felixscherz
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carljm,
AlexWaygood,
sharkdp and
dcreager
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dcreager
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Jun 16, 2025
* main: (38 commits) [`pyupgrade`] Suppress `UP008` diagnostic if `super` symbol is not builtin (#18688) [pylint] Fix `PLW0128` to check assignment targets in square brackets and after asterisks (#18665) [`refurb`] Make the fix for `FURB163` unsafe for `log2`, `log10`, `*args`, and deleted comments (#18645) [ty] allow `T: Never` as subtype of `Never` (#18687) [ty] Use more parallelism when running corpus tests (#18711) [ty] Support `dataclasses.KW_ONLY` (#18677) [`ruff`] Check for non-context-manager use of `pytest.raises`, `pytest.warns`, and `pytest.deprecated_call` (`RUF061`) (#17368) Add syntax error when conversion flag does not immediately follow exclamation mark (#18706) [`flake8-pyi`] Fix `custom-typevar-for-self` with string annotations (`PYI019`) (#18311) Drop confusing second `*` from glob pattern example (#18709) [ty] Stabilize completions (#18650) [ty] Correctly label typeshed-sync PRs (#18702) Update Rust crate memchr to v2.7.5 (#18696) Update dependency react-resizable-panels to v3.0.3 (#18691) Update Rust crate clap to v4.5.40 (#18692) Update Rust crate libcst to v1.8.2 (#18695) Update Rust crate jiff to v0.2.15 (#18693) Update Rust crate libc to v0.2.173 (#18694) Update Rust crate syn to v2.0.103 (#18698) Update Rust crate toml to v0.8.23 (#18699) ...
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Hi, this is intended to resolve astral-sh/ty#638.
Summary
Check
Type::has_relation_tofor the upper bound of aTypeVarInstancewhen checking the relation toNever.Test Plan
Added markdown tests.