Temporarily prohibit proc macro attributes placed after derives #54277
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... and also proc macro attributes used together with test/bench.
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Temporarily prohibit proc macro attributes placed after derives ... and also proc macro attributes used together with `#[test]`/`#[bench]`. Addresses item 6 from #50911 (comment). The end goal is straightforward predictable left-to-right expansion order for attributes. Right now derives are expanded last regardless of their relative ordering with macro attributes and right now it's simpler to temporarily prohibit macro attributes placed after derives than changing the expansion order. I'm not sure whether the new beta is already released or not, but if it's released, then this patch needs to be backported, so the solution needs to be minimal. How to fix broken code (derives): - Move macro attributes above derives. This won't change expansion order, they are expanded before derives anyway. Using attribute macros on same items with `#[test]` and `#[bench]` is prohibited for similar expansion order reasons, but this one is going to be reverted much sooner than restrictions on derives. How to fix broken code (test/bench): - Enable `#![feature(plugin)]` (don't ask why). r? @ghost
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The restrictions were introduced in rust-lang#54277 and no longer necessary now because legacy plugins are now expanded in usual left-to-right order
eddyb
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| fn deref_mut(&mut self) -> &mut T { | ||
| &mut self.ptr | ||
| } | ||
| } |
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This was intentionally not implemented, but I'm considering ways in which we can make ASTs fully immutable (and interned, I suppose).
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`P<T>` has implemented `DerefMut` since rust-lang#54277. While this was lamented at the time [1], rustc now relies on it extensively via the many implementors of MutVisitor. Updates the docs to reflect that `P<T>` is fundamentally mutable, and a few other cleanups to make them nicer to browse. [1]: rust-lang#54277 (comment) [2]: https://doc.rust-lang.org/1.77.1/nightly-rustc/rustc_ast/mut_visit/trait.MutVisitor.html#implementors
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`P<T>` has implemented `DerefMut` since rust-lang#54277. While this was lamented at the time [1], rustc now relies on it extensively via the many implementors of MutVisitor [2]. Updates the docs to reflect that `P<T>` is fundamentally mutable, and a few other cleanups to make them nicer to browse. [1]: rust-lang#54277 (comment) [2]: https://doc.rust-lang.org/1.77.1/nightly-rustc/rustc_ast/mut_visit/trait.MutVisitor.html#implementors
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`P<T>` has implemented `DerefMut` since rust-lang#54277. While this was lamented at the time [1], rustc now relies on it extensively via the many implementors of MutVisitor [2]. Updates the docs to reflect that `P<T>` is fundamentally mutable, and a few other cleanups to make them nicer to browse. [1]: rust-lang#54277 (comment) [2]: https://doc.rust-lang.org/1.77.1/nightly-rustc/rustc_ast/mut_visit/trait.MutVisitor.html#implementors
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rustc_ast: Update `P<T>` docs to reflect mutable status. `P<T>` has implemented `DerefMut` since rust-lang#54277. While this was lamented at the time [1], rustc now relies on it extensively via the many implementors of MutVisitor [2]. Updates the docs to reflect that `P<T>` is fundamentally mutable, and a few other cleanups to make them nicer to browse. [1]: rust-lang#54277 (comment) [2]: https://doc.rust-lang.org/1.77.1/nightly-rustc/rustc_ast/mut_visit/trait.MutVisitor.html#implementors r? `@Nilstrieb`
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Rollup merge of rust-lang#123393 - aDotInTheVoid:ast-p-docs, r=Nilstrieb rustc_ast: Update `P<T>` docs to reflect mutable status. `P<T>` has implemented `DerefMut` since rust-lang#54277. While this was lamented at the time [1], rustc now relies on it extensively via the many implementors of MutVisitor [2]. Updates the docs to reflect that `P<T>` is fundamentally mutable, and a few other cleanups to make them nicer to browse. [1]: rust-lang#54277 (comment) [2]: https://doc.rust-lang.org/1.77.1/nightly-rustc/rustc_ast/mut_visit/trait.MutVisitor.html#implementors r? `@Nilstrieb`
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... and also proc macro attributes used together with
#[test]/#[bench].Addresses item 6 from #50911 (comment).
The end goal is straightforward predictable left-to-right expansion order for attributes.
Right now derives are expanded last regardless of their relative ordering with macro attributes and right now it's simpler to temporarily prohibit macro attributes placed after derives than changing the expansion order.
I'm not sure whether the new beta is already released or not, but if it's released, then this patch needs to be backported, so the solution needs to be minimal.
How to fix broken code (derives):
Using attribute macros on same items with
#[test]and#[bench]is prohibited for similar expansion order reasons, but this one is going to be reverted much sooner than restrictions on derives (UPDATE: reverted in #54336).How to fix broken code (test/bench):
#.r? @ghost