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8216b359e5
expand/resolve: Pre-requisites to "Turn `#[derive]` into a regular macro attribute" Miscellaneous refactorings and error reporting changes extracted from https://github.com/rust-lang/rust/pull/79078. Unlike https://github.com/rust-lang/rust/pull/79078 this PR doesn't make any observable changes to the language or library. r? ```@Aaron1011```