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Add a new `mismatched-lifetime-syntaxes` lint The lang-team [discussed this](https://hackmd.io/nf4ZUYd7Rp6rq-1svJZSaQ) and I attempted to [summarize](https://github.com/rust-lang/rust/pull/120808#issuecomment-2701863833) their decision. The summary-of-the-summary is: - Using two different kinds of syntax for elided lifetimes is confusing. In rare cases, it may even [lead to unsound code](https://github.com/rust-lang/rust/issues/48686)! Some examples: ```rust // Lint will warn about these fn(v: ContainsLifetime) -> ContainsLifetime<'_>; fn(&'static u8) -> &u8; ``` - Matching up references with no lifetime syntax, references with anonymous lifetime syntax, and paths with anonymous lifetime syntax is an exception to the simplest possible rule: ```rust // Lint will not warn about these fn(&u8) -> &'_ u8; fn(&'_ u8) -> &u8; fn(&u8) -> ContainsLifetime<'_>; ``` - Having a lint for consistent syntax of elided lifetimes will make the [future goal](https://github.com/rust-lang/rust/issues/91639) of warning-by-default for paths participating in elision much simpler. --- This new lint attempts to accomplish the goal of enforcing consistent syntax. In the process, it supersedes and replaces the existing `elided-named-lifetimes` lint, which means it starts out life as warn-by-default. |
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