Add flag to configure noalias on Box<T>#99436
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r? @fee1-dead (rust-highfive has picked a reviewer for you, use r? to override) |
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Wait, (Checking the code) ah, |
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How about |
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noalias on Box<T>noalias on Box<T>
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The changes look good to me, but to make sure that it works, can you please add a test? (see this for info) |
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I added a test to ensure that noalias doesn't get passed when the flag is set to no. Now that I think about it, I should add another test for the default case. |
To aid making an informed decision about the aliasing rules of box, give users an option to remove `noalias` from box.
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So, I hope it works now. |
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looks good to me pending CI green.
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@fee1-dead and it's green now 🎉 |
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@bors r+ |
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Rollup of 7 pull requests Successful merges: - rust-lang#98101 (stdlib support for Apple WatchOS) - rust-lang#99345 (Do not allow typeck children items to constrain outer RPITs) - rust-lang#99383 (Formalize defining_use_anchor) - rust-lang#99436 (Add flag to configure `noalias` on `Box<T>`) - rust-lang#99483 (Fix a numerical underflow in tuple wrap suggestion) - rust-lang#99485 (Stop injecting `#[allow(unused_qualifications)]` in generated `derive` implementations) - rust-lang#99486 (Refactor: remove a string comparison between types in `check_str_addition`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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The aliasing rules of
Box<T>are still not decided, but currently,Box<T>is unique and getsnoalias. To aid making an informed decision about the future ofBox<T>, this PR adds a flag-Zbox-noaliasto configurenoaliasforBox<T>(for example, for benchmarking). The same flag already exists for&mut Tnoalias, where it was added because it was the problem of various miscompilations in LLVM.For more information, see rust-lang/unsafe-code-guidelines#326