[ty] Reduce the overwhelming complexity of TypeInferenceBuilder::infer_call_expression
#18943
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carljm
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Jun 25, 2025
dcreager
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Jun 26, 2025
* main: [ty] Add regression-benchmark for attribute-assignment hang (#18957) [ty] Format conflicting types as an enumeration (#18956) [ty] Prevent union builder construction for just one declaration (#18954) [ty] Infer nonlocal types as unions of all reachable bindings (#18750) [`pyflakes`] Mark `F504`/`F522`/`F523` autofix as unsafe if there's a call with side effect (#18839) [`playground`] Add ruff logo docs link to Header.tsx (#18947) [ty] Reduce the overwhelming complexity of `TypeInferenceBuilder::infer_call_expression` (#18943) [ty] Add subdiagnostic about empty bodies in more cases (#18942) [ty] Move search path resolution to `Options::to_program_settings` (#18937) [`flake8-errmsg`] Extend `EM101` to support byte strings (#18867) Move big rule implementations (#18931) [`pylint`] Allow fix with comments and document performance implications (`PLW3301`) (#18936)
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Summary
This function is huge, and hugely indented. This PR breaks most of it out into two helper functions:
KnownFunction::check_call()andKnownClass::check_call.My immediate motivation is that we need to add yet more special cases to this function in order to properly handle
tupleinstantiations and instantiations of tuple subclasses. But I really don't relish the thought of doing that with the function's current structure 😆Test Plan
Existing tests all pass. No new ones are added; this is a pure refactor that should have no functional change.