[ty] Add tests for generic implicit type aliases#21522
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sharkdp
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AlexWaygood,
carljm and
dcreager
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I guess one pathological case you could add would be something like from typing import TypeVar
T = TypeVar("T")
U = TypeVar("U")
S = TypeVar("S")
A = dict[T, U]
B = A[int, S]
def f(x: B[str]):
reveal_type(x) # revealed: dict[int, str] |
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Doesn't seem too pathological. I'll add something like this. |
dcreager
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Nov 19, 2025
* origin/main: [ty] Fix flaky tests on macos (#21524) [ty] Add tests for generic implicit type aliases (#21522) [ty] Semantic tokens: consistently add the `DEFINITION` modifier (#21521) Only render hyperlinks for terminals known to support them (#21519) [ty] Keep colorizing `mypy_primer` output (#21515) [ty] Exit with `2` if there's any IO error (#21508) [`ruff`] Fix false positive for complex conversion specifiers in `logging-eager-conversion` (`RUF065`) (#21464) [ty] tighten up handling of subscripts in type expressions (#21503)
dcreager
added a commit
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Nov 19, 2025
* origin/main: [ty] Fix flaky tests on macos (#21524) [ty] Add tests for generic implicit type aliases (#21522) [ty] Semantic tokens: consistently add the `DEFINITION` modifier (#21521) Only render hyperlinks for terminals known to support them (#21519) [ty] Keep colorizing `mypy_primer` output (#21515) [ty] Exit with `2` if there's any IO error (#21508) [`ruff`] Fix false positive for complex conversion specifiers in `logging-eager-conversion` (`RUF065`) (#21464) [ty] tighten up handling of subscripts in type expressions (#21503)
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Summary
Add a set of comprehensive tests for generic implicit type aliases to illustrate the current behavior with many flavors of
@Todotypes and false positive diagnostics.The tests are partially based on the typing conformance suite, and the expected behavior has been checked against other type checkers.