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fix RELEASES: we do not support upcasting to auto traits #126314

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merged 1 commit into from
Jun 12, 2024

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@lcnr lcnr commented Jun 12, 2024

#119338 does not actually support casts from dyn Trait to dyn Auto, only from dyn Trait to dyn Trait + Auto. The following test does not compile

trait Trait: Send {}
impl<T: Send> Trait for T {}

fn foo() {
    let x: &i32 = &1;
    let y = x as &dyn Trait as &dyn Send;
}

it actually also doesn't compile with feature(trait_upcasting), opened #126313 for that

r? @Mark-Simulacrum @cuviper

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-release Relevant to the release subteam, which will review and decide on the PR/issue. labels Jun 12, 2024
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@bors r+ p=10 rollup

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bors commented Jun 12, 2024

📌 Commit bbc5509 has been approved by pietroalbini

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 12, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Jun 12, 2024
…kingjubilee

Rollup of 16 pull requests

Successful merges:

 - rust-lang#123374 (DOC: Add FFI example for slice::from_raw_parts())
 - rust-lang#124514 (Recommend to never display zero disambiguators when demangling v0 symbols)
 - rust-lang#125978 (Cleanup: HIR ty lowering: Consolidate the places that do assoc item probing & access checking)
 - rust-lang#125980 (Nvptx remove direct passmode)
 - rust-lang#126187 (For E0277 suggest adding `Result` return type for function when using QuestionMark `?` in the body.)
 - rust-lang#126210 (docs(core): make more const_ptr doctests assert instead of printing)
 - rust-lang#126249 (Simplify `[T; N]::try_map` signature)
 - rust-lang#126256 (Add {{target}} substitution to compiletest)
 - rust-lang#126263 (Make issue-122805.rs big endian compatible)
 - rust-lang#126281 (set_env: State the conclusion upfront)
 - rust-lang#126286 (Make `storage-live.rs` robust against rustc internal changes.)
 - rust-lang#126287 (Update a cranelift patch file for formatting changes.)
 - rust-lang#126301 (Use `tidy` to sort crate attributes for all compiler crates.)
 - rust-lang#126305 (Make PathBuf less Ok with adding UTF-16 then `into_string`)
 - rust-lang#126310 (Migrate run make prefer rlib)
 - rust-lang#126314 (fix RELEASES: we do not support upcasting to auto traits)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 0a52849 into rust-lang:master Jun 12, 2024
6 checks passed
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jun 12, 2024
Rollup merge of rust-lang#126314 - lcnr:fix-relnotes, r=pietroalbini

fix RELEASES: we do not support upcasting to auto traits

rust-lang#119338 does not actually support casts from `dyn Trait` to `dyn Auto`, only from `dyn Trait` to `dyn Trait + Auto`. The following test does not compile

```rust
trait Trait: Send {}
impl<T: Send> Trait for T {}

fn foo() {
    let x: &i32 = &1;
    let y = x as &dyn Trait as &dyn Send;
}
```
it actually also doesn't compile with `feature(trait_upcasting)`, opened rust-lang#126313 for that

r? `@Mark-Simulacrum` `@cuviper`
@rustbot rustbot added this to the 1.81.0 milestone Jun 12, 2024
@lcnr lcnr deleted the fix-relnotes branch June 12, 2024 13:42
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bors commented Jun 12, 2024

⌛ Testing commit bbc5509 with merge bbe9a9c...

bjorn3 pushed a commit to bjorn3/rust that referenced this pull request Jun 30, 2024
…kingjubilee

Rollup of 16 pull requests

Successful merges:

 - rust-lang#123374 (DOC: Add FFI example for slice::from_raw_parts())
 - rust-lang#124514 (Recommend to never display zero disambiguators when demangling v0 symbols)
 - rust-lang#125978 (Cleanup: HIR ty lowering: Consolidate the places that do assoc item probing & access checking)
 - rust-lang#125980 (Nvptx remove direct passmode)
 - rust-lang#126187 (For E0277 suggest adding `Result` return type for function when using QuestionMark `?` in the body.)
 - rust-lang#126210 (docs(core): make more const_ptr doctests assert instead of printing)
 - rust-lang#126249 (Simplify `[T; N]::try_map` signature)
 - rust-lang#126256 (Add {{target}} substitution to compiletest)
 - rust-lang#126263 (Make issue-122805.rs big endian compatible)
 - rust-lang#126281 (set_env: State the conclusion upfront)
 - rust-lang#126286 (Make `storage-live.rs` robust against rustc internal changes.)
 - rust-lang#126287 (Update a cranelift patch file for formatting changes.)
 - rust-lang#126301 (Use `tidy` to sort crate attributes for all compiler crates.)
 - rust-lang#126305 (Make PathBuf less Ok with adding UTF-16 then `into_string`)
 - rust-lang#126310 (Migrate run make prefer rlib)
 - rust-lang#126314 (fix RELEASES: we do not support upcasting to auto traits)

r? `@ghost`
`@rustbot` modify labels: rollup
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5 participants