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Summary -- This PR extends semantic syntax error detection to red-knot. The main changes here are: 1. Adding `SemanticSyntaxChecker` and `Vec<SemanticSyntaxError>` fields to the `SemanticIndexBuilder` 2. Calling `SemanticSyntaxChecker::visit_stmt` and `visit_expr` in the `SemanticIndexBuilder`'s `visit_stmt` and `visit_expr` methods 3. Implementing `SemanticSyntaxContext` for `SemanticIndexBuilder` 4. Adding new mdtests to test the context implementation and show diagnostics (3) is definitely the trickiest and required (I think) a minor addition to the `SemanticIndexBuilder`. I tried to look around for existing code performing the necessary checks, but I definitely could have missed something or misused the existing code even when I found it. There's still one TODO around `global` statement handling. I don't think there's an existing way to look this up, but I'm happy to work on that here or in a separate PR. This currently only affects detection of one error (`LoadBeforeGlobalDeclaration` or [PLE0118](https://docs.astral.sh/ruff/rules/load-before-global-declaration/) in ruff), so it's not too big of a problem even if we leave the TODO. Test Plan -- New mdtests, as well as new errors for existing mdtests --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com> |
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