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change `NormalizesTo` to fully structurally normalize notes in https://hackmd.io/wZ016dE4QKGIhrOnHLlThQ need to also update the dev-guide once this PR lands. in short, the setup is now as follows: `normalizes-to` internally implements one step normalization, applying that normalization to the `goal.predicate.term` causes the projected term to get recursively normalized. With this `normalizes-to` normalizes until the projected term is rigid, meaning that we normalize as many steps necessary, but at least 1. To handle rigid aliases, we add another candidate only if the 1 to inf step normalization failed. With this `normalizes-to` is now full structural normalization. We can now change `AliasRelate` to simply emit `normalizes-to` goals for the rhs and lhs. This avoids the concerns from https://github.com/rust-lang/trait-system-refactor-initiative/issues/103 and generally feels cleaner |
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