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Minor tweaks to `compare_impl_item.rs` 1. Stop using the `InstantiatedPredicates` struct for `hybrid_preds` in `compare_impl_item.rs`, since we never actually push anything into the `spans` part of it. 2. Remove redundant impl args and don't do useless identity substitution, prefer calling `instantiate_identity`.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.