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Summary of Changes

Hello @xuhuanzy, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the type analysis capabilities within the emmylua_code_analysis crate. It introduces more flexible rules for type casting, specifically enabling parent-to-child conversions, and enhances generic type checking to handle any parameters more gracefully by focusing on base type compatibility. These changes aim to improve the accuracy and usability of the diagnostic checks for Lua code.

Highlights

  • Enhanced Type Casting: The type checker now explicitly allows casting from a parent type to a child type, improving flexibility in type conversions within the cast_type_check function.
  • Flexible Generic Type Matching: When a generic type parameter is any, the type checker will now only compare the base types, making generic type matching more robust and less restrictive in such scenarios.
  • New Test Case for Generic Types: A new test test_self_contain_tpl was added to validate the improved generic type checking logic, particularly for self-referential generic types with any parameters.
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Code Review

This pull request introduces fixes for type checking, specifically for type casting and generic types. The casting logic is relaxed to allow conversions between parent and child classes. The generic type checking is updated to correctly handle types with any as a generic parameter. A new test case is added to validate the generic type fix. My feedback includes a suggestion to refactor a nested match statement to use or_else for better code clarity and idiomatic Rust.

Comment on lines +201 to +207
match semantic_model.type_check_detail(target_type, origin_type) {
Ok(_) => Ok(()),
Err(_) => match semantic_model.type_check_detail(origin_type, target_type) {
Ok(_) => Ok(()),
Err(reason) => Err(reason),
},
}

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medium

This nested match can be simplified using Result::or_else. This would make the code more idiomatic, readable, and concise by chaining the two type check attempts.

            semantic_model.type_check_detail(target_type, origin_type)
                .or_else(|_| semantic_model.type_check_detail(origin_type, target_type))

@xuhuanzy xuhuanzy requested a review from CppCXY October 13, 2025 09:43
@CppCXY CppCXY merged commit a218090 into EmmyLuaLs:main Oct 13, 2025
22 checks passed
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2 participants