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[red-knot] De-duplicate symbol table query (#16515)

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## Summary

This PR does a small refactor to avoid double
`symbol_table(...).symbol(...)` call to check for `__slots__` and
`TYPE_CHECKING`. It merges them into a single call.

I noticed this while looking at
https://github.com/astral-sh/ruff/pull/16468.
This commit is contained in:
Dhruv Manilawala 2025-03-05 13:06:21 +05:30 • committed by GitHub
parent bb44926ca5
commit d94a78a134
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1 changed files with 5 additions and 3 deletions
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8
crates/red_knot_python_semantic/src/symbol.rs
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@ -458,12 +458,14 @@ fn symbol_by_id<'db>(
// a diagnostic if we see it being modified externally. In type inference, we
// can assign a "narrow" type to it even if it is not *declared*. This means, we
// do not have to call [`widen_type_for_undeclared_public_symbol`].
//
// `TYPE_CHECKING` is a special variable that should only be assigned `False`
// at runtime, but is always considered `True` in type checking.
// See mdtest/known_constants.md#user-defined-type_checking for details.
let is_considered_non_modifiable = symbol_table(db, scope).symbol(symbol_id).name()
== "__slots__"
|| symbol_table(db, scope).symbol(symbol_id).name() == "TYPE_CHECKING";
let is_considered_non_modifiable = matches!(
symbol_table(db, scope).symbol(symbol_id).name().as_str(),
"__slots__" | "TYPE_CHECKING"
);
widen_type_for_undeclared_public_symbol(db, inferred, is_considered_non_modifiable)
.into()