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New higher-ranked lifetime error #105501
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Category: This is a bug.
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regression-from-stable-to-nightly
Performance or correctness regression from stable to nightly.
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tmandry
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regression-from-stable-to-nightly
Performance or correctness regression from stable to nightly.
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Dec 20, 2022
Swatinem
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Dec 30, 2022
The test was minified from the published `msf-ice:0.2.1` crate which failed in a crater run. A faulty compiler was triggering a `higher-ranked lifetime error`: > could not prove `[async block@...]: Send`
bors
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Dec 30, 2022
… r=petrochenkov Add regression test for rust-lang#105501 The test was minified from the published crate `msf-ice:0.2.1` which failed in a crater run. A faulty compiler was triggering a `higher-ranked lifetime error`: > could not prove `[async block@...]: Send` The testcase has some complexity, as it has a simplified subset of `futures::StreamExt` in it, but the error is only being triggered by a few layers of nesting. For example removing the noop `then` call would have been enough to make the error go away.
Swatinem
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Jan 17, 2023
- Eliminates all the `get_context` calls that async lowering created. - Replace all `Local` `ResumeTy` types with `&mut Context<'_>`. The `Local`s that have their types replaced are: - The `resume` argument itself. - The argument to `get_context`. - The yielded value of a `yield`. The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`. Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors. See <rust-lang#105501>. The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`.
matthiaskrgr
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Jan 18, 2023
Transform async `ResumeTy` in generator transform - Eliminates all the `get_context` calls that async lowering created. - Replace all `Local` `ResumeTy` types with `&mut Context<'_>`. The `Local`s that have their types replaced are: - The `resume` argument itself. - The argument to `get_context`. - The yielded value of a `yield`. The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`. Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors. See <rust-lang#105501>. The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`. --- Fixes https://github.com/bjorn3/rustc_codegen_cranelift/issues/1330 CC `@bjorn3` r? `@compiler-errors`
Swatinem
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Jan 19, 2023
- Eliminates all the `get_context` calls that async lowering created. - Replace all `Local` `ResumeTy` types with `&mut Context<'_>`. The `Local`s that have their types replaced are: - The `resume` argument itself. - The argument to `get_context`. - The yielded value of a `yield`. The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`. Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors. See <rust-lang#105501>. The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`.
GuillaumeGomez
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Jan 19, 2023
Transform async `ResumeTy` in generator transform - Eliminates all the `get_context` calls that async lowering created. - Replace all `Local` `ResumeTy` types with `&mut Context<'_>`. The `Local`s that have their types replaced are: - The `resume` argument itself. - The argument to `get_context`. - The yielded value of a `yield`. The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`. Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors. See <rust-lang#105501>. The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`. --- Fixes https://github.com/bjorn3/rustc_codegen_cranelift/issues/1330 CC `@bjorn3` r? `@compiler-errors`
thomcc
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May 31, 2023
- Eliminates all the `get_context` calls that async lowering created. - Replace all `Local` `ResumeTy` types with `&mut Context<'_>`. The `Local`s that have their types replaced are: - The `resume` argument itself. - The argument to `get_context`. - The yielded value of a `yield`. The `ResumeTy` hides a `&mut Context<'_>` behind an unsafe raw pointer, and the `get_context` function is being used to convert that back to a `&mut Context<'_>`. Ideally the async lowering would not use the `ResumeTy`/`get_context` indirection, but rather directly use `&mut Context<'_>`, however that would currently lead to higher-kinded lifetime errors. See <rust-lang/rust#105501>. The async lowering step and the type / lifetime inference / checking are still using the `ResumeTy` indirection for the time being, and that indirection is removed here. After this transform, the generator body only knows about `&mut Context<'_>`.
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Labels
C-bug
Category: This is a bug.
P-critical
Critical priority
regression-from-stable-to-nightly
Performance or correctness regression from stable to nightly.
The code here is part of a closed-source project unfortunately. I could share relevant bits and pieces upon request but I can't provide the whole thing for others to build.
cargo bisect-rustc blames b28d30e
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