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1c771fec33
Make NLL Type Relating Eager We previously instantiated bound regions in nll type relating lazily. Making this eager is more consistent with how we handle type relating in [`higher_ranked_sub`](https://github.com/rust-lang/rust/blob/0a3b557d528dd7c8a88ceca6f7dc0699b89a3ef4/compiler/rustc_infer/src/infer/higher_ranked/mod.rs#L28) and should allow us to short circuit in case there's structural equality.