[ty] Improve diagnostic for failed assignment to a Callable type.#25308
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Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 91.94%. The percentage of expected errors that received a diagnostic held steady at 87.09%. The number of fully passing files held steady at 92/134. |
Memory usage reportMemory usage unchanged ✅ |
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Callable type.Callable type.
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Merging this PR will not alter performance
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carljm
approved these changes
May 29, 2026
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Summary
This improves the diagnostic we show when an assignment to a
Callabletype fails. That diagnostic now contains additional context that describes the inferred callable type that failed. The result is that the full explanation of the failed assignment is more coherent.Closes astral-sh/ty#866.
Test Plan
Please see updated tests.