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Re: #17526 ## Summary Add integration tests for Python Semantic Syntax for `InvalidStarExpression`, `DuplicateMatchKey`, and `DuplicateMatchClassAttribute`. ## Note - Red knot integration tests for `DuplicateMatchKey` exist already in line 89-101. <!-- What's the purpose of the change? What does it do, and why? --> ## Test Plan This is a test. <!-- How was it tested? -->
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.