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cfg_select: Support unbraced expressions Tracking issue for `cfg_select`: rust-lang/rust#115585 When operating on expressions, `cfg_select!` can now handle expressions without braces. (It still requires braces for other things, such as items.) Expand the test coverage and documentation accordingly. --- I'm not sure whether deciding to extend `cfg_select!` in this way is T-lang or T-libs-api. I've labeled for both, with the request that both teams don't block on each other. :)