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Rollup merge of rust-lang#107488 - nnethercote:fix-PartialEq-syntax, …
…r=RalfJung Fix syntax in `-Zunpretty-expanded` output for derived `PartialEq`. If you do `derive(PartialEq)` on a packed struct, the output shown by `-Zunpretty=expanded` includes expressions like this: ``` { self.x } == { other.x } ``` This is invalid syntax. This doesn't break compilation, because the AST nodes are constructed within the compiler. But it does mean anyone using `-Zunpretty=expanded` output as a guide for hand-written impls could get a nasty surprise. This commit fixes things by instead using this form: ``` ({ self.x }) == ({ other.x }) ``` r? `@RalfJung`
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