[ty] Refactor TypeInferenceBuilder::infer_subscript_expression_types#19658
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AlexWaygood merged 2 commits intomainfrom Jul 31, 2025
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[ty] Refactor TypeInferenceBuilder::infer_subscript_expression_types#19658AlexWaygood merged 2 commits intomainfrom
TypeInferenceBuilder::infer_subscript_expression_types#19658AlexWaygood merged 2 commits intomainfrom
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* main: (39 commits) [ty] Initial test suite for `TypedDict` (#19686) [ty] Improve debuggability of protocol types (#19662) [ty] Simplify lifetime requirements for `PySlice` trait (#19687) [ty] Improve `isinstance()` truthiness analysis for generic types (#19668) [`refurb`] Make example error out-of-the-box (`FURB164`) (#19673) Fix link: unused_import.rs (#19648) [ty] Remove `Specialization::display` (full) (#19682) [ty] Remove `KnownModule::is_enum` (#19681) [ty] Support `__setitem__` and improve `__getitem__` related diagnostics (#19578) [ty] Sync vendored typeshed stubs (#19676) [`flake8-use-pathlib`] Expand `PTH201` to check all `PurePath` subclasses (#19440) [`refurb`] Make example error out-of-the-box (`FURB180`) (#19672) [`pyupgrade`] Prevent infinite loop with `I002` (`UP010`, `UP035`) (#19413) [ty] Improve the `Display` for generic `type[]` types (#19667) [ty] Refactor `TypeInferenceBuilder::infer_subscript_expression_types` (#19658) Fix tests on 32-bit architectures (#19652) [ty] Move `pandas-stubs` to bad.txt (#19659) [ty] Remove special casing for string-literal-in-tuple `__contains__` (#19642) Update pre-commit's `ruff` id (#19654) Update salsa (#19449) ...
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Summary
This PR refactors the generic fallback
matcharm inTypeInferenceBuilder::infer_subscript_expression_typesinto a closure that can be called from multiple places. This refactor has several advantages:.expect("Checked in branch arm")calls peppered across the function.slice_literal(db)at the top of the function; instead, we only do it in the branch arms forTypevariants that we know could plausibly represent asliceinstance typeTest Plan
All existing tests pass