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Remove separate indexing of early-bound regions ~Based on https://github.com/rust-lang/rust/pull/99728.~ This PR copies some modifications from https://github.com/rust-lang/rust/pull/97839 around object lifetime defaults. These modifications allow to stop counting generic parameters during lifetime resolution, and rely on the indexing given by `rustc_typeck::collect`.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.