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[red-knot] Support typing.TYPE_CHECKING (#14952)

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## Summary

Add support for `typing.TYPE_CHECKING` and
`typing_extensions.TYPE_CHECKING`.

relates to: https://github.com/astral-sh/ruff/issues/14170

## Test Plan

New Markdown-based tests
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David Peter 2024-12-13 10:24:48 +01:00 • committed by GitHub
parent f52b1f4a4d
commit e96b13c027
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8
crates/red_knot_python_semantic/src/types.rs
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@ -120,6 +120,14 @@ fn symbol_by_id<'db>(db: &'db dyn Db, scope: ScopeId<'db>, symbol: ScopedSymbolI
/// Shorthand for `symbol_by_id` that takes a symbol name instead of an ID.
fn symbol<'db>(db: &'db dyn Db, scope: ScopeId<'db>, name: &str) -> Symbol<'db> {
// We don't need to check for `typing_extensions` here, because `typing_extensions.TYPE_CHECKING`
// is just a re-export of `typing.TYPE_CHECKING`.
if name == "TYPE_CHECKING"
&& file_to_module(db, scope.file(db)).is_some_and(|module| module.name() == "typing")
{
return Symbol::Type(Type::BooleanLiteral(true), Boundness::Bound);
}
let table = symbol_table(db, scope);
table
.symbol_id_by_name(name)