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Rollup of 10 pull requests #133786

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@jhpratt jhpratt commented Dec 3, 2024

Successful merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

madsmtm and others added 30 commits November 22, 2024 20:46
The deployment target environment variable is OS-specific, and if you're
in a place where you're asking `rustc` for the deployment target, you're
likely to also wanna know the environment variable.
On nightly, we mention the trait is unstable

```
error[E0277]: the trait bound `T: Unstable` is not satisfied
  --> $DIR/unstable-trait-suggestion.rs:13:9
   |
LL |     foo(t)
   |     --- ^ the trait `Unstable` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `foo`
  --> $DIR/unstable-trait-suggestion.rs:9:11
   |
LL | fn foo<T: Unstable>(_: T) {}
   |           ^^^^^^^^ required by this bound in `foo`
help: consider restricting type parameter `T` but it is an `unstable` trait
   |
LL | pub fn demo<T: Unstable>(t: T) {
   |              ++++++++++
```

On stable, we don't suggest the trait at all

```
error[E0277]: the trait bound `T: Unstable` is not satisfied
  --> $DIR/unstable-trait-suggestion.rs:13:9
   |
LL |     foo(t)
   |     --- ^ the trait `Unstable` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `foo`
  --> $DIR/unstable-trait-suggestion.rs:9:11
   |
LL | fn foo<T: Unstable>(_: T) {}
   |           ^^^^^^^^ required by this bound in `foo`
```
This test will break when `Step` gets stabilized, but punt until then.
```
help: consider restricting type parameter `T` with traits `Copy` and `Trait`
   |
LL | fn duplicate_custom<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) {
   |                      ++++++++++++++
```

```
help: consider restricting type parameter `V` with trait `Copy`
   |
LL | fn index<'a, K, V: std::marker::Copy>(map: &'a HashMap<K, V>, k: K) -> &'a V {
   |                  +++++++++++++++++++
```
Pass in an appropriate `Option<DefId>` in more cases from hir ty lowering.
Co-authored-by: zachs18 <[email protected]>
…v-var, r=davidtwco

Print name of env var in `--print=deployment-target`

The deployment target environment variable is OS-specific, and if you're in a place where you're asking `rustc` for the deployment target, you're likely to also wanna know the name of the environment variable. I myself wanted this for some code I'm working on in bootstrap, for example.

Behaviour before this PR:
```console
$ rustc --print=deployment-target --target=aarch64-apple-darwin
deployment_target=11.0
$ rustc --print=deployment-target --target=aarch64-apple-visionos
deployment_target=1.0
```

Behaviour after this PR:
```console
$ rustc --print=deployment-target --target=aarch64-apple-darwin
MACOSX_DEPLOYMENT_TARGET=11.0
$ rustc --print=deployment-target --target=aarch64-apple-visionos
XROS_DEPLOYMENT_TARGET=1.0
```

My _belief_ is that this option is extremely rarely used in general, and a GitHub search for "rustc print deployment-target" seems to confirm this, it revealed only the following actual pieces of code using this:
- https://github.com/PyO3/maturin/blob/b292ef69349f2a56cb8ab1b59fda0be3d3b9f138/src/build_context.rs#L1199-L1220
- https://github.com/rust-lang/cc-rs/blob/daab9244b03e244c4f2511944870d719c443f61f/src/lib.rs#L3422-L3426

`maturin` does `.split('=').last()`, so it will continue to work after this change, but `cc v1.0.84` did `.strip_prefix("deployment_target=")` since [this PR](rust-lang/cc-rs#848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](rust-lang/cc-rs#901) [reverted](rust-lang/cc-rs#943) in `v1.0.85`.

So while this is _technically_ a breaking change, I really doubt that anyone is going to observe it, so it's probably fine.

`@BlackHoleFox` wdyt?

`@rustbot` label O-apple
r? compiler
Stabilize noop_waker

Tracking Issue: rust-lang#98286

This is a handy feature that's been used widely in tests and example async code and it'd be nice to make it available to users.

cc ``@rust-lang/wg-async``
…it, r=compiler-errors

Don't suggest restricting bound with unstable traits on stable and mention it's unstable on nightly

On nightly, we mention the trait is unstable

```
error[E0277]: the trait bound `T: Unstable` is not satisfied
  --> $DIR/unstable-trait-suggestion.rs:13:9
   |
LL |     foo(t)
   |     --- ^ the trait `Unstable` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `foo`
  --> $DIR/unstable-trait-suggestion.rs:9:11
   |
LL | fn foo<T: Unstable>(_: T) {}
   |           ^^^^^^^^ required by this bound in `foo`
help: consider restricting type parameter `T` but it is an `unstable` trait
   |
LL | pub fn demo<T: Unstable>(t: T) {
   |              ++++++++++
```

On stable, we don't suggest the trait at all

```
error[E0277]: the trait bound `T: Unstable` is not satisfied
  --> $DIR/unstable-trait-suggestion.rs:13:9
   |
LL |     foo(t)
   |     --- ^ the trait `Unstable` is not implemented for `T`
   |     |
   |     required by a bound introduced by this call
   |
note: required by a bound in `foo`
  --> $DIR/unstable-trait-suggestion.rs:9:11
   |
LL | fn foo<T: Unstable>(_: T) {}
   |           ^^^^^^^^ required by this bound in `foo`
```

Fix rust-lang#133511.
…youxu

Lint against Symbol::intern on a string literal

Disabled in tests where this doesn't make much sense
…ve-probe-adt, r=lcnr

Structurally resolve in `probe_adt`

fixes rust-lang#132320

r? lcnr
…tive-if-let-rescope, r=jieyouxu

Reduce false positives on some common cases from if-let-rescope lint

r? ``@jieyouxu``

We would like to identify a very common case in the ecosystem in which we do not need to apply the lint suggestion for the new Edition 2024 `if let` semantics.

In this patch we excluded linting from `if let`s in statements and block tail expressions. In these simple cases, new Edition 2024 drop orders are identical to those of Edition 2021 and prior.

However, conservatively we should still lint for the other cases, because [this example](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=2113df5ce78f161d32a1190faf5c7469) shows that the drop order changes are very pronounced, some of which are even sensitive to runtime data.
…ingjubilee

stabilize const_{size,align}_of_val

FCP passed [here](rust-lang#46571 (comment)).

Fixes rust-lang#46571.
… r=jieyouxu

document -Zrandomize-layout in the unstable book

tracking issue: rust-lang#106764
fixes rust-lang#130462
…id, r=compiler-errors

Use correct `hir_id` for array const arg infers

Fixes rust-lang#133771

`self.next_id()` results in the `DefId` for the const argument, created from the hack introduced by rust-lang#133468, having no `HirId` associated with it. This then results in an ICE in metadata encoding. Fixing this then results in *another* ICE where `encode_defs` was not skipping encoding `type_of` and other queries for `DefId`s when they correspond to a `ConstArgKind::Infer` node.

This only reproduces with a library crate as metadata is not encoded for binaries, and apparently we had 0 tests for `generic_arg_infer` for array lengths in a library crate so this was not caught :<

cc rust-lang#133589 ``@voidc``

r? ``@compiler-errors`` ``@lcnr``
@rustbot rustbot added A-run-make Area: port run-make Makefiles to rmake.rs PG-exploit-mitigations Project group: Exploit mitigations S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver) rollup A PR which is a rollup labels Dec 3, 2024
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jhpratt commented Dec 3, 2024

@bors r+ rollup=never p=10

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bors commented Dec 3, 2024

📌 Commit 02ae277 has been approved by jhpratt

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 Dec 3, 2024
@matthiaskrgr
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#133089 failed already in #133783

@jhpratt jhpratt deleted the rollup-qn1bizm branch December 3, 2024 06:49
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A-run-make Area: port run-make Makefiles to rmake.rs PG-exploit-mitigations Project group: Exploit mitigations rollup A PR which is a rollup S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)
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