Rustup #14667
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Rustup #14667
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This allows us to better distinguish builtin and overloaded implicit dereferences.
It's a much better name, more consistent with how we name such things. Also rename `Lifetime::res` as `Lifetime::kind` to match. I suspect this field used to have the type `LifetimeRes` and then the type was changed but the field name remained the same.
I'm removing empty identifiers everywhere, because in practice they always mean "no identifier" rather than "empty identifier". (An empty identifier is impossible.) It's better to use `Option` to mean "no identifier" because you then can't forget about the "no identifier" possibility. Some specifics: - When testing an attribute for a single name, the commit uses the `has_name` method. - When testing an attribute for multiple names, the commit uses the new `has_any_name` method. - When using `match` on an attribute, the match arms now have `Some` on them. In the tests, we now avoid printing empty identifiers by not printing the identifier in the `error:` line at all, instead letting the carets point out the problem.
deref patterns: implement implicit deref patterns This implements implicit deref patterns (per https://hackmd.io/4qDDMcvyQ-GDB089IPcHGg#Implicit-deref-patterns) and adds tests and an unstable book chapter. Best reviewed commit-by-commit. Overall there's a lot of additions, but a lot of that is tests, documentation, and simple(?) refactoring. Tracking issue: #87121 r? ``@Nadrieril``
Remove `name_or_empty` Another step towards #137978. r? ``@jdonszelmann``
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Out of cycle sync, as the sync to Rust failed again and resolving conflicts there is awkward.
r? @ghost
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