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Suggest Replacing Comma with Semicolon in Incorrect Repeat Expressions Fixes #80173 This PR detects typos in repeat expressions like `["_", 10]` and `vec![String::new(), 10]` and suggests replacing comma with semicolon. Also, improves code in other place by adding doc comments and making use of a helper function to check if a type implements `Clone`. References: 1. For `vec![T; N]`: https://doc.rust-lang.org/std/macro.vec.html 2. For `[T; N]`: https://doc.rust-lang.org/std/primitive.array.html