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rustc: Remove `#[rustc_synthetic]` This function parameter attribute was introduced in https://github.com/rust-lang/rust/pull/44866 as an intermediate step in implementing `impl Trait`, it's not necessary or used anywhere by itself. Noticed while reviewing https://github.com/rust-lang/rust/pull/90947.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.