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Allow `#![doc(test(attr(..)))]` everywhere This PR adds the ability to specify [`#![doc(test(attr(..)))]`](https://doc.rust-lang.org/nightly/rustdoc/write-documentation/the-doc-attribute.html#testattr) ~~at module level~~ everywhere in addition to allowing it at crate-root. This is motivated by a recent PR #140323 (by ````@tgross35)```` where we have to duplicate 2 attributes to every single `f16` and `f128` doctests, by allowing `#![doc(test(attr(..)))]` at module level (and everywhere else) we can omit them entirely and just have (in both module): ```rust #![doc(test(attr(feature(cfg_target_has_reliable_f16_f128))))] #![doc(test(attr(expect(internal_features))))] ``` Those new attributes are appended to the one found at crate-root or at a previous module. Those "global" attributes are compatible with merged doctests (they already were before). Given the small addition that this is, I'm proposing to insta-stabilize it, but I can feature-gate it if preferred. Best reviewed commit by commit. r? ````@GuillaumeGomez````